<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e286b-71b7-7446-9478-99d93033629e,g:3772a3db-ae79-4a9c-9265-829a61b08f70-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/UNAUDITEDCONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT" xlink:type="simple" xlink:href="hymc-20260630.xsd#UNAUDITEDCONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/UNAUDITEDCONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e286b-7289-7b09-8d6f-6c9bba981437" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e286b-7289-7ca5-99b3-dd7a10effd1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e286b-7289-7b09-8d6f-6c9bba981437" xlink:to="loc_us-gaap_StatementTable_019e286b-7289-7ca5-99b3-dd7a10effd1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e286b-7289-79c9-ba7c-f49a0d13fef8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e286b-7289-7ca5-99b3-dd7a10effd1b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e286b-7289-79c9-ba7c-f49a0d13fef8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e286b-7289-79c9-ba7c-f49a0d13fef8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e286b-7289-79c9-ba7c-f49a0d13fef8" xlink:to="loc_us-gaap_EquityComponentDomain_019e286b-7289-79c9-ba7c-f49a0d13fef8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e286b-7289-7d88-bc58-2cfdf72a726e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e286b-7289-79c9-ba7c-f49a0d13fef8" xlink:to="loc_us-gaap_EquityComponentDomain_019e286b-7289-7d88-bc58-2cfdf72a726e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e286b-7289-7fbc-b8db-5d52cf58ee04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e286b-7289-7d88-bc58-2cfdf72a726e" xlink:to="loc_us-gaap_CommonStockMember_019e286b-7289-7fbc-b8db-5d52cf58ee04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e286b-7289-76cf-8de1-7bbcf49d6278" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e286b-7289-7d88-bc58-2cfdf72a726e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e286b-7289-76cf-8de1-7bbcf49d6278" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e286b-7289-76e0-baf8-d921a13087d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e286b-7289-7d88-bc58-2cfdf72a726e" xlink:to="loc_us-gaap_RetainedEarningsMember_019e286b-7289-76e0-baf8-d921a13087d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e286b-7289-7b09-8d6f-6c9bba981437" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e286b-7289-72e6-b9f8-ff9187621fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e286b-7289-72e6-b9f8-ff9187621fc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e286b-7289-7d20-b249-9af0eb717d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_StockholdersEquity_019e286b-7289-7d20-b249-9af0eb717d1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_WarrantsExercisedDuringPeriodShares_019e286b-7289-7534-b08e-4e0d6ede5e97" xlink:href="hymc-20260630.xsd#hymc_WarrantsExercisedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_hymc_WarrantsExercisedDuringPeriodShares_019e286b-7289-7534-b08e-4e0d6ede5e97" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019e286b-7289-76b1-92e8-a472a865d9ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019e286b-7289-76b1-92e8-a472a865d9ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019e286b-7289-7db6-891a-460864572371" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019e286b-7289-7db6-891a-460864572371" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_WarrantsExercisedDuringPeriodValue_019e286b-7289-7a9d-8e6a-09025d795b75" xlink:href="hymc-20260630.xsd#hymc_WarrantsExercisedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_hymc_WarrantsExercisedDuringPeriodValue_019e286b-7289-7a9d-8e6a-09025d795b75" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e286b-7289-709d-8788-4feea948ce5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e286b-7289-709d-8788-4feea948ce5a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e286b-7289-7d5f-b66d-4eb3dfab86c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e286b-7289-7d5f-b66d-4eb3dfab86c4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019e286b-7289-7fb0-965f-7e9774dd956c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019e286b-7289-7fb0-965f-7e9774dd956c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SurrenderOfSharesByShareholderShares_019e286b-7289-7686-ab83-7570ba2d865a" xlink:href="hymc-20260630.xsd#hymc_SurrenderOfSharesByShareholderShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_hymc_SurrenderOfSharesByShareholderShares_019e286b-7289-7686-ab83-7570ba2d865a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e286b-7289-7928-a54f-b2043dc6e41e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e286b-7289-77af-8c2d-78f279f59cc2" xlink:to="loc_us-gaap_NetIncomeLoss_019e286b-7289-7928-a54f-b2043dc6e41e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e286b-7289-735d-bbf4-3c3fac1c5117" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e286b-7289-7688-8cfc-3d13033d74f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/PropertyplantandequipmentandassetsheldforsalenetScheduleofComponentsofPlantandEquipmentNetDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#PropertyplantandequipmentandassetsheldforsalenetScheduleofComponentsofPlantandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/PropertyplantandequipmentandassetsheldforsalenetScheduleofComponentsofPlantandEquipmentNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e286b-7289-712a-a28e-d78bbded2532" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e286b-7289-712a-a28e-d78bbded2532" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e286b-7289-7d9a-ba4e-8709a3aa31c2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e286b-7289-712a-a28e-d78bbded2532" xlink:to="loc_srt_RangeAxis_019e286b-7289-7d9a-ba4e-8709a3aa31c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e286b-7289-7d9a-ba4e-8709a3aa31c2_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e286b-7289-7d9a-ba4e-8709a3aa31c2" xlink:to="loc_srt_RangeMember_019e286b-7289-7d9a-ba4e-8709a3aa31c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e286b-7289-7dea-9e0f-2e3974d731bd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e286b-7289-7d9a-ba4e-8709a3aa31c2" xlink:to="loc_srt_RangeMember_019e286b-7289-7dea-9e0f-2e3974d731bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e286b-7289-74c2-8636-e7384fd12bf5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e286b-7289-7dea-9e0f-2e3974d731bd" xlink:to="loc_srt_MinimumMember_019e286b-7289-74c2-8636-e7384fd12bf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e286b-7289-77bc-ae8d-5368b72d810d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e286b-7289-7dea-9e0f-2e3974d731bd" xlink:to="loc_srt_MaximumMember_019e286b-7289-77bc-ae8d-5368b72d810d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e286b-7289-7a0e-bd42-616a03f80292" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e286b-7289-712a-a28e-d78bbded2532" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e286b-7289-7a0e-bd42-616a03f80292" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-7a0e-bd42-616a03f80292_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e286b-7289-7a0e-bd42-616a03f80292" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-7a0e-bd42-616a03f80292_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e286b-7289-7a0e-bd42-616a03f80292" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ProcessingEquipmentMember_019e286b-7289-7188-b6f9-94bb73598e2a" xlink:href="hymc-20260630.xsd#hymc_ProcessingEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_hymc_ProcessingEquipmentMember_019e286b-7289-7188-b6f9-94bb73598e2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ProductionLeachPadsMember_019e286b-7289-7712-8f77-49b0e8217347" xlink:href="hymc-20260630.xsd#hymc_ProductionLeachPadsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_hymc_ProductionLeachPadsMember_019e286b-7289-7712-8f77-49b0e8217347" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_019e286b-7289-742c-ae19-dca6b826adb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_019e286b-7289-742c-ae19-dca6b826adb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_TestLeachPadsMember_019e286b-7289-7d73-bf67-040634051eb2" xlink:href="hymc-20260630.xsd#hymc_TestLeachPadsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_hymc_TestLeachPadsMember_019e286b-7289-7d73-bf67-040634051eb2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_MineEquipmentMember_019e286b-7289-7248-b1f6-d435f0572487" xlink:href="hymc-20260630.xsd#hymc_MineEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_hymc_MineEquipmentMember_019e286b-7289-7248-b1f6-d435f0572487" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_019e286b-7289-7085-9638-28004ce5c9fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_us-gaap_VehiclesMember_019e286b-7289-7085-9638-28004ce5c9fd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_019e286b-7289-74af-b775-2495d9176cb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_019e286b-7289-74af-b775-2495d9176cb1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_MineralPropertiesMember_019e286b-7289-705d-b5f3-b6f424587dc8" xlink:href="hymc-20260630.xsd#hymc_MineralPropertiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_hymc_MineralPropertiesMember_019e286b-7289-705d-b5f3-b6f424587dc8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_019e286b-7289-708c-a6df-6528bd240378" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e286b-7289-76c1-a19e-b4ab3502da11" xlink:to="loc_us-gaap_ConstructionInProgressMember_019e286b-7289-708c-a6df-6528bd240378" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e286b-7289-7327-a93d-83dc15904a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e286b-7289-7327-a93d-83dc15904a9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019e286b-7289-7a45-aaf2-736af74f2bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019e286b-7289-7a45-aaf2-736af74f2bb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019e286b-7289-7ee8-addd-e5eb661fdb5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019e286b-7289-7ee8-addd-e5eb661fdb5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019e286b-7289-706f-8889-3da7240018a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019e286b-7289-706f-8889-3da7240018a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019e286b-7289-77de-a168-a70bb01499ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019e286b-7289-77de-a168-a70bb01499ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_PropertyPlantAndEquipmentAndAssetsHeldForSaleNet_019e286b-7289-7f76-b034-6d040f50e36b" xlink:href="hymc-20260630.xsd#hymc_PropertyPlantAndEquipmentAndAssetsHeldForSaleNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e286b-7289-78a5-a15a-ad74c682b0dd" xlink:to="loc_hymc_PropertyPlantAndEquipmentAndAssetsHeldForSaleNet_019e286b-7289-7f76-b034-6d040f50e36b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/PropertyplantandequipmentandassetsheldforsalenetNarrativeDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#PropertyplantandequipmentandassetsheldforsalenetNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/PropertyplantandequipmentandassetsheldforsalenetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019e286b-7289-7e89-bdaa-81b1e1ebd306" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019e286b-7289-7df8-8ccf-287531abda32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019e286b-7289-7e89-bdaa-81b1e1ebd306" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019e286b-7289-7df8-8ccf-287531abda32" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019ec940-38ad-76dc-bdf6-396e9d643942" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019e286b-7289-7df8-8ccf-287531abda32" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019ec940-38ad-76dc-bdf6-396e9d643942" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019ec940-38ad-76dc-bdf6-396e9d643942_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019ec940-38ad-76dc-bdf6-396e9d643942" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019ec940-38ad-76dc-bdf6-396e9d643942_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019ec940-38ad-74e7-917d-d85deafce8d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019ec940-38ad-76dc-bdf6-396e9d643942" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019ec940-38ad-74e7-917d-d85deafce8d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019ec940-38ad-7449-99b2-4029ffb8c490" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019ec940-38ad-74e7-917d-d85deafce8d4" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019ec940-38ad-7449-99b2-4029ffb8c490" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ec940-38ad-7882-ad4b-989fcc1b5d8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019e286b-7289-7df8-8ccf-287531abda32" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ec940-38ad-7882-ad4b-989fcc1b5d8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ec940-38ad-7882-ad4b-989fcc1b5d8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ec940-38ad-7882-ad4b-989fcc1b5d8f" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ec940-38ad-7882-ad4b-989fcc1b5d8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ec940-38ad-7a25-8ab5-f4225986ac71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ec940-38ad-7882-ad4b-989fcc1b5d8f" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ec940-38ad-7a25-8ab5-f4225986ac71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SAGMillMember_019ec940-38ad-7482-9611-48c7bcd0b8d1" xlink:href="hymc-20260630.xsd#hymc_SAGMillMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ec940-38ad-7a25-8ab5-f4225986ac71" xlink:to="loc_hymc_SAGMillMember_019ec940-38ad-7482-9611-48c7bcd0b8d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019ec940-38ad-7418-9711-ffca15ade845" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019e286b-7289-7e89-bdaa-81b1e1ebd306" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019ec940-38ad-7418-9711-ffca15ade845" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_NumberOfMills_019e286b-7289-72c6-a85a-4f82e3bdf3a4" xlink:href="hymc-20260630.xsd#hymc_NumberOfMills"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019e286b-7289-7e89-bdaa-81b1e1ebd306" xlink:to="loc_hymc_NumberOfMills_019e286b-7289-72c6-a85a-4f82e3bdf3a4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/RestrictedcashScheduleofComponentsofRestrictedCashDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#RestrictedcashScheduleofComponentsofRestrictedCashDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/RestrictedcashScheduleofComponentsofRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-783e-8d19-c9bd3a7c39f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-75ee-86ac-1a7b9f125ee9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-783e-8d19-c9bd3a7c39f6" xlink:to="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-75ee-86ac-1a7b9f125ee9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7934-8c1b-04e366fe2056" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-75ee-86ac-1a7b9f125ee9" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7934-8c1b-04e366fe2056" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7934-8c1b-04e366fe2056_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7934-8c1b-04e366fe2056" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7934-8c1b-04e366fe2056_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7c7a-9c62-901f26042478" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7934-8c1b-04e366fe2056" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7c7a-9c62-901f26042478" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SuretyBondCashCollateralMember_019e286b-728a-7ec6-ba70-1a988bea5bdc" xlink:href="hymc-20260630.xsd#hymc_SuretyBondCashCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7c7a-9c62-901f26042478" xlink:to="loc_hymc_SuretyBondCashCollateralMember_019e286b-728a-7ec6-ba70-1a988bea5bdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_OtherCashCollateralMember_019e286b-728a-7d84-b569-60a86936df1f" xlink:href="hymc-20260630.xsd#hymc_OtherCashCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7c7a-9c62-901f26042478" xlink:to="loc_hymc_OtherCashCollateralMember_019e286b-728a-7d84-b569-60a86936df1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_019e286b-728a-7409-b0ce-4acbcd87ca4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-783e-8d19-c9bd3a7c39f6" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_019e286b-728a-7409-b0ce-4acbcd87ca4f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/RestrictedcashNarrativeDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#RestrictedcashNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/RestrictedcashNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-75d2-a462-50a325583f75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-7b81-9fd9-25ce701adad6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-75d2-a462-50a325583f75" xlink:to="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-7b81-9fd9-25ce701adad6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_019e286b-728a-7aac-9d67-540f88f2e113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-7b81-9fd9-25ce701adad6" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_019e286b-728a-7aac-9d67-540f88f2e113" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019e286b-728a-7aac-9d67-540f88f2e113_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019e286b-728a-7aac-9d67-540f88f2e113" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019e286b-728a-7aac-9d67-540f88f2e113_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019e286b-728a-71b6-86e9-5791203a94e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019e286b-728a-7aac-9d67-540f88f2e113" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019e286b-728a-71b6-86e9-5791203a94e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SuretyBondHycroftMineFinancialRequirementsMember_019e286b-728a-7396-8ab4-b59778bcfc02" xlink:href="hymc-20260630.xsd#hymc_SuretyBondHycroftMineFinancialRequirementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019e286b-728a-71b6-86e9-5791203a94e2" xlink:to="loc_hymc_SuretyBondHycroftMineFinancialRequirementsMember_019e286b-728a-7396-8ab4-b59778bcfc02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SuretyBondHycroftMineFinancialRequirementsWaterWellFieldAndExplorationMember_019e286b-728a-7f4e-9b8c-c727b8c8ac9b" xlink:href="hymc-20260630.xsd#hymc_SuretyBondHycroftMineFinancialRequirementsWaterWellFieldAndExplorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019e286b-728a-71b6-86e9-5791203a94e2" xlink:to="loc_hymc_SuretyBondHycroftMineFinancialRequirementsWaterWellFieldAndExplorationMember_019e286b-728a-7f4e-9b8c-c727b8c8ac9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7766-9591-5f3b837804ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019e286b-728a-7b81-9fd9-25ce701adad6" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7766-9591-5f3b837804ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7766-9591-5f3b837804ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7766-9591-5f3b837804ae" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7766-9591-5f3b837804ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7968-ac8e-bcb7b3ef905e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_019e286b-728a-7766-9591-5f3b837804ae" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7968-ac8e-bcb7b3ef905e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ReclamationAndOtherSuretyBondCashCollateralMember_019e286b-728a-7246-932b-cf443567c95d" xlink:href="hymc-20260630.xsd#hymc_ReclamationAndOtherSuretyBondCashCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7968-ac8e-bcb7b3ef905e" xlink:to="loc_hymc_ReclamationAndOtherSuretyBondCashCollateralMember_019e286b-728a-7246-932b-cf443567c95d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_RestrictedCashMember_019e286b-728a-7716-8624-93076891deaa" xlink:href="hymc-20260630.xsd#hymc_RestrictedCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e286b-728a-7968-ac8e-bcb7b3ef905e" xlink:to="loc_hymc_RestrictedCashMember_019e286b-728a-7716-8624-93076891deaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_019e286b-728a-70e4-a3d3-039b0fec7228" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-75d2-a462-50a325583f75" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_019e286b-728a-70e4-a3d3-039b0fec7228" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019e286b-728a-73fc-a310-8f4e47fd5eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-75d2-a462-50a325583f75" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019e286b-728a-73fc-a310-8f4e47fd5eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019e286b-728a-72a3-9872-d8b50e1c2655" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019e286b-728a-75d2-a462-50a325583f75" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019e286b-728a-72a3-9872-d8b50e1c2655" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/ContractliabilitiesDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#ContractliabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/ContractliabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019e286b-736e-7dd5-a645-0b16239f19fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongLivedAssetsHeldForSaleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019e286b-736e-71bd-bcc8-caca590d0774" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019e286b-736e-7dd5-a645-0b16239f19fe" xlink:to="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019e286b-736e-71bd-bcc8-caca590d0774" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019e286b-736e-70ed-bc5b-64fe1569e7fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019e286b-736e-71bd-bcc8-caca590d0774" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019e286b-736e-70ed-bc5b-64fe1569e7fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019e286b-736e-70ed-bc5b-64fe1569e7fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019e286b-736e-70ed-bc5b-64fe1569e7fc" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019e286b-736e-70ed-bc5b-64fe1569e7fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019e286b-736e-7950-a0bb-028795a46490" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019e286b-736e-70ed-bc5b-64fe1569e7fc" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019e286b-736e-7950-a0bb-028795a46490" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SemiAutogenousMillMember_019f1312-6054-7cc4-9fcb-943dea6d8d9b" xlink:href="hymc-20260630.xsd#hymc_SemiAutogenousMillMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019e286b-736e-7950-a0bb-028795a46490" xlink:to="loc_hymc_SemiAutogenousMillMember_019f1312-6054-7cc4-9fcb-943dea6d8d9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019e286b-736e-7b18-9744-50ad4efaaf58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019e286b-736e-7dd5-a645-0b16239f19fe" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019e286b-736e-7b18-9744-50ad4efaaf58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_NumberOfMills_019e286b-736e-7d8e-adc8-353e70ecd859" xlink:href="hymc-20260630.xsd#hymc_NumberOfMills"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019e286b-736e-7dd5-a645-0b16239f19fe" xlink:to="loc_hymc_NumberOfMills_019e286b-736e-7d8e-adc8-353e70ecd859" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/AssetretirementobligationNarrativeDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#AssetretirementobligationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/AssetretirementobligationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongLivedAssetsHeldForSaleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019f5910-e089-7e98-b981-32d2ff5026fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:to="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019f5910-e089-7e98-b981-32d2ff5026fd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019f5910-e089-7c61-a990-613c52ea8544" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019f5910-e089-7e98-b981-32d2ff5026fd" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019f5910-e089-7c61-a990-613c52ea8544" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019f5910-e089-7c61-a990-613c52ea8544_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019f5910-e089-7c61-a990-613c52ea8544" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019f5910-e089-7c61-a990-613c52ea8544_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019f5910-e089-7606-81dc-5cd43f0a6070" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019f5910-e089-7c61-a990-613c52ea8544" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019f5910-e089-7606-81dc-5cd43f0a6070" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_MeasurementInputInflationRateMember_019f5910-e089-7049-bbe3-75f9c884a706" xlink:href="hymc-20260630.xsd#hymc_MeasurementInputInflationRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019f5910-e089-7606-81dc-5cd43f0a6070" xlink:to="loc_hymc_MeasurementInputInflationRateMember_019f5910-e089-7049-bbe3-75f9c884a706" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019f59ff-6339-7480-b0e2-67b99aa02575" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019f5910-e089-7606-81dc-5cd43f0a6070" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019f59ff-6339-7480-b0e2-67b99aa02575" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019f7d21-086a-796e-bd59-a763918bb557" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019f5910-e089-7e98-b981-32d2ff5026fd" xlink:to="loc_srt_RangeAxis_019f7d21-086a-796e-bd59-a763918bb557" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f7d21-086a-796e-bd59-a763918bb557_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019f7d21-086a-796e-bd59-a763918bb557" xlink:to="loc_srt_RangeMember_019f7d21-086a-796e-bd59-a763918bb557_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f7d21-086a-79df-a908-cfd07c2cb192" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019f7d21-086a-796e-bd59-a763918bb557" xlink:to="loc_srt_RangeMember_019f7d21-086a-79df-a908-cfd07c2cb192" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019f7d21-7fa0-70c1-a99d-db5c9d2c859f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f7d21-086a-79df-a908-cfd07c2cb192" xlink:to="loc_srt_MinimumMember_019f7d21-7fa0-70c1-a99d-db5c9d2c859f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019f7d21-dbbd-767e-a87e-78041d8d8dfc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f7d21-086a-79df-a908-cfd07c2cb192" xlink:to="loc_srt_MaximumMember_019f7d21-dbbd-767e-a87e-78041d8d8dfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f7ffc-9b95-74c9-bab8-6898e297f47b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_019f5910-e089-7e98-b981-32d2ff5026fd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f7ffc-9b95-74c9-bab8-6898e297f47b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f7ffc-9b95-74c9-bab8-6898e297f47b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f7ffc-9b95-74c9-bab8-6898e297f47b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f7ffc-9b95-74c9-bab8-6898e297f47b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f7ffc-9b95-7ad9-887e-808cf4307205" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f7ffc-9b95-74c9-bab8-6898e297f47b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f7ffc-9b95-7ad9-887e-808cf4307205" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_HycroftMineMember_019f7ffd-2fb0-7994-931e-0821a40c0b99" xlink:href="hymc-20260630.xsd#hymc_HycroftMineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f7ffc-9b95-7ad9-887e-808cf4307205" xlink:to="loc_hymc_HycroftMineMember_019f7ffd-2fb0-7994-931e-0821a40c0b99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligationRevisionOfEstimate_019f5910-e089-7bf4-aa92-2276f76bf37e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetRetirementObligationRevisionOfEstimate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:to="loc_us-gaap_AssetRetirementObligationRevisionOfEstimate_019f5910-e089-7bf4-aa92-2276f76bf37e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019f7ffb-d0e1-751c-8666-67f4ce764bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019f7ffb-d0e1-751c-8666-67f4ce764bb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_AssetRetirementObligationMeasurementInput_019f5912-7b77-79b6-a1c9-aa4e74babcbb" xlink:href="hymc-20260630.xsd#hymc_AssetRetirementObligationMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:to="loc_hymc_AssetRetirementObligationMeasurementInput_019f5912-7b77-79b6-a1c9-aa4e74babcbb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_AssetRetirementObligationEstimatedUndiscountedCashFlows_019f5910-e089-722e-822a-3a7d34980eea" xlink:href="hymc-20260630.xsd#hymc_AssetRetirementObligationEstimatedUndiscountedCashFlows"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:to="loc_hymc_AssetRetirementObligationEstimatedUndiscountedCashFlows_019f5910-e089-722e-822a-3a7d34980eea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_AssetRetirementObligationEstimatedCashFlowsExpectedToBeIncurred_019f5910-e089-7fba-8b41-4dfd92717253" xlink:href="hymc-20260630.xsd#hymc_AssetRetirementObligationEstimatedCashFlowsExpectedToBeIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_019f5910-e089-7902-ae9e-27b8ec4886e9" xlink:to="loc_hymc_AssetRetirementObligationEstimatedCashFlowsExpectedToBeIncurred_019f5910-e089-7fba-8b41-4dfd92717253" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/StockholdersequityNarrativeDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#StockholdersequityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/StockholdersequityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_019e286b-728a-7150-9145-cf0fcdac1b03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_019e286b-728a-7150-9145-cf0fcdac1b03" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019e286b-728a-7e17-9f7e-f5f7b31b6549" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_019e286b-728a-7150-9145-cf0fcdac1b03" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019e286b-728a-7e17-9f7e-f5f7b31b6549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e286b-728a-7e17-9f7e-f5f7b31b6549_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019e286b-728a-7e17-9f7e-f5f7b31b6549" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e286b-728a-7e17-9f7e-f5f7b31b6549_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e286b-728a-7c7a-9138-870570f73498" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019e286b-728a-7e17-9f7e-f5f7b31b6549" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e286b-728a-7c7a-9138-870570f73498" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_NewAtTheMarketOfferingMember_019e286b-728a-71d5-9cf0-2f2bdb7f0bb0" xlink:href="hymc-20260630.xsd#hymc_NewAtTheMarketOfferingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e286b-728a-7c7a-9138-870570f73498" xlink:to="loc_hymc_NewAtTheMarketOfferingMember_019e286b-728a-71d5-9cf0-2f2bdb7f0bb0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-799b-ae47-06578ae0402c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_019e286b-728a-7150-9145-cf0fcdac1b03" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-799b-ae47-06578ae0402c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-799b-ae47-06578ae0402c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-799b-ae47-06578ae0402c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-799b-ae47-06578ae0402c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-74fa-b98b-2e8ab330663f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-799b-ae47-06578ae0402c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-74fa-b98b-2e8ab330663f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_PrivatePlacementOffering20252YearWarrantsMember_019e286b-728a-77b0-928e-6778c532212c" xlink:href="hymc-20260630.xsd#hymc_PrivatePlacementOffering20252YearWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-74fa-b98b-2e8ab330663f" xlink:to="loc_hymc_PrivatePlacementOffering20252YearWarrantsMember_019e286b-728a-77b0-928e-6778c532212c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_EquityWarrantPublicOfferingWarrants2025ThreeYearMember_019e286b-728a-70a1-a57e-70ce0a46abfb" xlink:href="hymc-20260630.xsd#hymc_EquityWarrantPublicOfferingWarrants2025ThreeYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-74fa-b98b-2e8ab330663f" xlink:to="loc_hymc_EquityWarrantPublicOfferingWarrants2025ThreeYearMember_019e286b-728a-70a1-a57e-70ce0a46abfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_PrivatePlacementOfferingWarrantsMember_019e286b-728a-7f3a-ba17-ad29a37736b3" xlink:href="hymc-20260630.xsd#hymc_PrivatePlacementOfferingWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-74fa-b98b-2e8ab330663f" xlink:to="loc_hymc_PrivatePlacementOfferingWarrantsMember_019e286b-728a-7f3a-ba17-ad29a37736b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019ed85a-0244-7a84-b1ed-449f692bb01d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019ed85a-0244-7a84-b1ed-449f692bb01d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_019ed85c-2050-7a96-9056-39c471b242c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_019ed85c-2050-7a96-9056-39c471b242c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SaleOfStockValueSharesAvailableForIssuanceUnderThePlan_019efccf-5888-7730-95cf-41692d1d95e1" xlink:href="hymc-20260630.xsd#hymc_SaleOfStockValueSharesAvailableForIssuanceUnderThePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_hymc_SaleOfStockValueSharesAvailableForIssuanceUnderThePlan_019efccf-5888-7730-95cf-41692d1d95e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ClassOfWarrantOrRightNumberOfWarrantsExercised_019e286b-728a-7f40-baa8-ddc5aa2aa9f2" xlink:href="hymc-20260630.xsd#hymc_ClassOfWarrantOrRightNumberOfWarrantsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_hymc_ClassOfWarrantOrRightNumberOfWarrantsExercised_019e286b-728a-7f40-baa8-ddc5aa2aa9f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019e286b-728a-79c9-8e4c-521f5978513b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019e286b-728a-79c9-8e4c-521f5978513b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromWarrantExercises_019e286b-728a-76c3-8500-2b3f2bdf23bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromWarrantExercises"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_ProceedsFromWarrantExercises_019e286b-728a-76c3-8500-2b3f2bdf23bc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ClassOfWarrantOrRightWarrantsExercised_019f1304-641b-7571-be89-876f5ecbe849" xlink:href="hymc-20260630.xsd#hymc_ClassOfWarrantOrRightWarrantsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_hymc_ClassOfWarrantOrRightWarrantsExercised_019f1304-641b-7571-be89-876f5ecbe849" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019efcce-8769-7a4e-8a33-07b1aeae2654" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019efcce-8769-7a4e-8a33-07b1aeae2654" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_019e286b-728a-762c-9d75-b5878e77630d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityNoteStockSplitConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_019e286b-728a-762c-9d75-b5878e77630d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_019e286b-728a-755e-956d-ee934cb704b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_019e286b-728a-755e-956d-ee934cb704b9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SharePriceTenDayAverage_019efcd6-f28a-70f6-85d2-e7ad34c2dc73" xlink:href="hymc-20260630.xsd#hymc_SharePriceTenDayAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_hymc_SharePriceTenDayAverage_019efcd6-f28a-70f6-85d2-e7ad34c2dc73" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019efcd7-3ebc-736c-ad2f-3f948e7dd7cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019e286b-728a-7a94-89a4-858622959a71" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019efcd7-3ebc-736c-ad2f-3f948e7dd7cd" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/StockholdersequityScheduleofOutstandingWarrantsDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#StockholdersequityScheduleofOutstandingWarrantsDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/StockholdersequityScheduleofOutstandingWarrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019e286b-728a-7824-919b-c402bfce25b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019e286b-728a-71fd-9e1c-b628ac531108" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e286b-728a-7824-919b-c402bfce25b4" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019e286b-728a-71fd-9e1c-b628ac531108" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-7ddf-b9e0-a8c562bbebdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019e286b-728a-71fd-9e1c-b628ac531108" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-7ddf-b9e0-a8c562bbebdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7ddf-b9e0-a8c562bbebdb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-7ddf-b9e0-a8c562bbebdb" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7ddf-b9e0-a8c562bbebdb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7990-a7eb-cb30524da562" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019e286b-728a-7ddf-b9e0-a8c562bbebdb" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7990-a7eb-cb30524da562" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_PrivatePlacementOfferingWarrantsMember_019e286b-728a-7903-8fcd-204dbae98c4b" xlink:href="hymc-20260630.xsd#hymc_PrivatePlacementOfferingWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7990-a7eb-cb30524da562" xlink:to="loc_hymc_PrivatePlacementOfferingWarrantsMember_019e286b-728a-7903-8fcd-204dbae98c4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_EquityWarrantPublicOfferingWarrants2025ThreeYearMember_019e286b-728a-72d0-bf97-d1749fca4984" xlink:href="hymc-20260630.xsd#hymc_EquityWarrantPublicOfferingWarrants2025ThreeYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7990-a7eb-cb30524da562" xlink:to="loc_hymc_EquityWarrantPublicOfferingWarrants2025ThreeYearMember_019e286b-728a-72d0-bf97-d1749fca4984" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_PrivatePlacementOffering20252YearWarrantsMember_019e286b-728a-798c-95a9-06ceeb574d74" xlink:href="hymc-20260630.xsd#hymc_PrivatePlacementOffering20252YearWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019e286b-728a-7990-a7eb-cb30524da562" xlink:to="loc_hymc_PrivatePlacementOffering20252YearWarrantsMember_019e286b-728a-798c-95a9-06ceeb574d74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019e286b-728a-7654-a69c-2a2d64e038af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e286b-728a-7824-919b-c402bfce25b4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019e286b-728a-7654-a69c-2a2d64e038af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingTerm_019e286b-728a-7dfb-90f8-92f35634cfc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantsAndRightsOutstandingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e286b-728a-7824-919b-c402bfce25b4" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingTerm_019e286b-728a-7dfb-90f8-92f35634cfc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019e286b-728a-73a5-8d40-2e838a0233f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e286b-728a-7824-919b-c402bfce25b4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019e286b-728a-73a5-8d40-2e838a0233f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_019e286b-728a-76ed-9d87-a3a9831db292" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e286b-728a-7824-919b-c402bfce25b4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_019e286b-728a-76ed-9d87-a3a9831db292" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/StockbasedcompensationNarrativeDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#StockbasedcompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/StockbasedcompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7716-91da-5005a4922237" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e286b-736d-776f-9277-c3df5c813364" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7716-91da-5005a4922237" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e286b-736d-776f-9277-c3df5c813364" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e286b-736d-7004-9554-481e894536d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e286b-736d-776f-9277-c3df5c813364" xlink:to="loc_us-gaap_AwardTypeAxis_019e286b-736d-7004-9554-481e894536d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7004-9554-481e894536d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e286b-736d-7004-9554-481e894536d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7004-9554-481e894536d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7255-b61e-8e17fe34781e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e286b-736d-7004-9554-481e894536d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7255-b61e-8e17fe34781e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e286b-736d-7203-b2df-444cab3f323b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7255-b61e-8e17fe34781e" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e286b-736d-7203-b2df-444cab3f323b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019e286b-736d-74e6-8818-1de93025275f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7716-91da-5005a4922237" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019e286b-736d-74e6-8818-1de93025275f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e286b-736d-7177-8fe5-872ac0982499" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7716-91da-5005a4922237" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e286b-736d-7177-8fe5-872ac0982499" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019e286b-736d-7145-b2a6-ecf89b9489ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7716-91da-5005a4922237" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019e286b-736d-7145-b2a6-ecf89b9489ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019e286b-736d-745a-929f-99f7757afa2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7716-91da-5005a4922237" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019e286b-736d-745a-929f-99f7757afa2b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/StockbasedcompensationScheduleofRestrictedStockUnitActivityDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#StockbasedcompensationScheduleofRestrictedStockUnitActivityDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/StockbasedcompensationScheduleofRestrictedStockUnitActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7cd0-ab91-3e49cfe54613" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e286b-736d-75a6-a13e-ca602d35ee62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7cd0-ab91-3e49cfe54613" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e286b-736d-75a6-a13e-ca602d35ee62" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e286b-736d-7867-b15f-04b74fc4a6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e286b-736d-75a6-a13e-ca602d35ee62" xlink:to="loc_us-gaap_AwardTypeAxis_019e286b-736d-7867-b15f-04b74fc4a6bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7867-b15f-04b74fc4a6bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e286b-736d-7867-b15f-04b74fc4a6bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7867-b15f-04b74fc4a6bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7e16-803a-b314c71e4284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e286b-736d-7867-b15f-04b74fc4a6bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7e16-803a-b314c71e4284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e286b-736d-72e9-b20b-22d0561fcdc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e286b-736d-7e16-803a-b314c71e4284" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e286b-736d-72e9-b20b-22d0561fcdc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e286b-736d-7c1e-9d9f-15b426d24977" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7cd0-ab91-3e49cfe54613" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e286b-736d-7c1e-9d9f-15b426d24977" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e286b-736d-7077-9105-13cc3cb79e09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e286b-736d-7c1e-9d9f-15b426d24977" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e286b-736d-7077-9105-13cc3cb79e09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e286b-736d-7bb1-819a-0b3fb0614dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e286b-736d-7c1e-9d9f-15b426d24977" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e286b-736d-7bb1-819a-0b3fb0614dfb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019e286b-736d-727d-8d09-73d63239c638" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e286b-736d-7c1e-9d9f-15b426d24977" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019e286b-736d-727d-8d09-73d63239c638" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019e286b-736d-7389-b1d6-128b07a1ca75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e286b-736d-7c1e-9d9f-15b426d24977" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019e286b-736d-7389-b1d6-128b07a1ca75" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e286b-736d-759d-b2ca-6f864362ec53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e286b-736d-75d6-a144-b423eb412bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e286b-736d-7cd0-ab91-3e49cfe54613" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e286b-736d-75d6-a144-b423eb412bfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e286b-736d-773e-8bbf-017af207f5fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e286b-736d-75d6-a144-b423eb412bfe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e286b-736d-773e-8bbf-017af207f5fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e286b-736d-7054-b254-5f5e258603f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e286b-736d-75d6-a144-b423eb412bfe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e286b-736d-7054-b254-5f5e258603f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019e286b-736d-7481-ab0f-4762adb868b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e286b-736d-75d6-a144-b423eb412bfe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019e286b-736d-7481-ab0f-4762adb868b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019e286b-736d-79d2-918b-26897a065008" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e286b-736d-75d6-a144-b423eb412bfe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019e286b-736d-79d2-918b-26897a065008" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e286b-736d-7bff-b81e-181ef7266de3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/FairvaluemeasurementsDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#FairvaluemeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/FairvaluemeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e286b-736d-7b09-baf9-17dc33e1a90a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e286b-736d-7bea-a3c4-917e75da786c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e286b-736d-7b09-baf9-17dc33e1a90a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e286b-736d-7bea-a3c4-917e75da786c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e286b-736d-7d0b-a930-5d194a82964a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e286b-736d-7bea-a3c4-917e75da786c" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e286b-736d-7d0b-a930-5d194a82964a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e286b-736d-7d0b-a930-5d194a82964a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e286b-736d-7d0b-a930-5d194a82964a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e286b-736d-7d0b-a930-5d194a82964a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e286b-736d-7238-bd14-998b7a2b7462" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e286b-736d-7d0b-a930-5d194a82964a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e286b-736d-7238-bd14-998b7a2b7462" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e286b-736d-7b3f-bfb7-b3ce88150375" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e286b-736d-7238-bd14-998b7a2b7462" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e286b-736d-7b3f-bfb7-b3ce88150375" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e286b-736d-73c9-8a50-95573dede6e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e286b-736d-7b09-baf9-17dc33e1a90a" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e286b-736d-73c9-8a50-95573dede6e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019e286b-736d-776a-bc74-a987e78a5247" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e286b-736d-73c9-8a50-95573dede6e8" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019e286b-736d-776a-bc74-a987e78a5247" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/LosspershareScheduleofAntidilutiveSecuritiesExcludedfromComputationDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#LosspershareScheduleofAntidilutiveSecuritiesExcludedfromComputationDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/LosspershareScheduleofAntidilutiveSecuritiesExcludedfromComputationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e286b-736e-7ae8-aa3c-b9cb197192c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e286b-736e-7ba8-922a-b300ab0a5fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e286b-736e-7ae8-aa3c-b9cb197192c1" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e286b-736e-7ba8-922a-b300ab0a5fcd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e286b-736e-7116-adce-f242c49cd0bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e286b-736e-7ba8-922a-b300ab0a5fcd" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e286b-736e-7116-adce-f242c49cd0bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7116-adce-f242c49cd0bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e286b-736e-7116-adce-f242c49cd0bc" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7116-adce-f242c49cd0bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7bde-b6fa-89d854f214ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e286b-736e-7116-adce-f242c49cd0bc" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7bde-b6fa-89d854f214ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019e286b-736e-781a-a129-a8ff17fd1606" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7bde-b6fa-89d854f214ba" xlink:to="loc_us-gaap_WarrantMember_019e286b-736e-781a-a129-a8ff17fd1606" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_RestrictedStockUnitsUnvestedMember_019e286b-736e-7c98-ae22-9254a2e4b032" xlink:href="hymc-20260630.xsd#hymc_RestrictedStockUnitsUnvestedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7bde-b6fa-89d854f214ba" xlink:to="loc_hymc_RestrictedStockUnitsUnvestedMember_019e286b-736e-7c98-ae22-9254a2e4b032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_RestrictedStockUnitsVestedWithDeferredConversionMember_019e286b-736e-7c7d-a368-d077c36181c6" xlink:href="hymc-20260630.xsd#hymc_RestrictedStockUnitsVestedWithDeferredConversionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e286b-736e-7bde-b6fa-89d854f214ba" xlink:to="loc_hymc_RestrictedStockUnitsVestedWithDeferredConversionMember_019e286b-736e-7c7d-a368-d077c36181c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e286b-736e-7cf1-b59d-6e3e9f4732fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e286b-736e-7ae8-aa3c-b9cb197192c1" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e286b-736e-7cf1-b59d-6e3e9f4732fc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hycroftmining.com/role/SegmentinformationScheduleofSegmentInformationDetails" xlink:type="simple" xlink:href="hymc-20260630.xsd#SegmentinformationScheduleofSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.hycroftmining.com/role/SegmentinformationScheduleofSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e286b-736e-7410-8610-180a60a5fc5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e286b-736e-7410-8610-180a60a5fc5d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e286b-736e-7e73-bb4d-c37e081652cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e286b-736e-7410-8610-180a60a5fc5d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e286b-736e-7e73-bb4d-c37e081652cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e286b-736e-7e73-bb4d-c37e081652cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e286b-736e-7e73-bb4d-c37e081652cd" xlink:to="loc_us-gaap_SegmentDomain_019e286b-736e-7e73-bb4d-c37e081652cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e286b-736e-7af5-8849-09b5630a841e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e286b-736e-7e73-bb4d-c37e081652cd" xlink:to="loc_us-gaap_SegmentDomain_019e286b-736e-7af5-8849-09b5630a841e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ReportableSegmentMember_019e286b-736e-7a94-a5d2-741ac91208a6" xlink:href="hymc-20260630.xsd#hymc_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e286b-736e-7af5-8849-09b5630a841e" xlink:to="loc_hymc_ReportableSegmentMember_019e286b-736e-7a94-a5d2-741ac91208a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExplorationExpense_019e286b-736e-7a0b-b988-c911187b08c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ExplorationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_us-gaap_ExplorationExpense_019e286b-736e-7a0b-b988-c911187b08c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_TechnicalAndProjectExpense_019e286b-736e-7c9a-bab2-153690d46eb8" xlink:href="hymc-20260630.xsd#hymc_TechnicalAndProjectExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_hymc_TechnicalAndProjectExpense_019e286b-736e-7c9a-bab2-153690d46eb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_MineMaintenanceExpense_019e286b-736e-73ae-a8dc-fc9445f6b4bc" xlink:href="hymc-20260630.xsd#hymc_MineMaintenanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_hymc_MineMaintenanceExpense_019e286b-736e-73ae-a8dc-fc9445f6b4bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_ProcessingMaintenanceExpense_019e286b-736e-7562-9055-fc47b5a35bc8" xlink:href="hymc-20260630.xsd#hymc_ProcessingMaintenanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_hymc_ProcessingMaintenanceExpense_019e286b-736e-7562-9055-fc47b5a35bc8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SiteLevelGeneralAndAdministrativeExpense_019e286b-736e-7b72-aff2-bacd9c90cb17" xlink:href="hymc-20260630.xsd#hymc_SiteLevelGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_hymc_SiteLevelGeneralAndAdministrativeExpense_019e286b-736e-7b72-aff2-bacd9c90cb17" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019e286b-736e-7187-a2ed-b80a35c08f58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019e286b-736e-7187-a2ed-b80a35c08f58" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_MineSitePeriodCostsOperatingExpenses_019e286b-736e-7534-b327-b0df1c98bf8e" xlink:href="hymc-20260630.xsd#hymc_MineSitePeriodCostsOperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_hymc_MineSitePeriodCostsOperatingExpenses_019e286b-736e-7534-b327-b0df1c98bf8e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hymc_SegmentExpenses_019e286b-736e-7fd1-8f42-710c1d05dd8c" xlink:href="hymc-20260630.xsd#hymc_SegmentExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e286b-736e-7ff8-bcfe-1910d1560168" xlink:to="loc_hymc_SegmentExpenses_019e286b-736e-7fd1-8f42-710c1d05dd8c" xlink:type="arc" order="7"/>
  </link:definitionLink>
</link:linkbase>
