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<!-- XBRL document created with Praxa -->
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<!-- Creation Date: 2026-09-25T20:35:26.3057+00:00 -->
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  <link:roleRef roleURI="http://example.com/20260630/role/LeaseLiabilityScheduleofLongTermAgreementfortheLeaseDetails" xlink:href="crml-20260630.xsd#LeaseLiabilityScheduleofLongTermAgreementfortheLeaseDetails" xlink:type="simple" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExplorationLicensesMember" xlink:label="crml_ExplorationLicensesMember_2173" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_MiningLicensesMember" xlink:label="crml_MiningLicensesMember_2174" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CorporateInformationAndStatementOfIFRSComplianceAbstract" xlink:label="ifrs-full_CorporateInformationAndStatementOfIFRSComplianceAbstract_2165" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_2167" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2168" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_TypeOfLicenseAxis" xlink:label="crml_TypeOfLicenseAxis_2171" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:label="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_2175" />
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    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_TypeOfLicenseDomainDomain_2172" xlink:to="crml_MiningLicensesMember_2174" />
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    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_2167" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_2168" />
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    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="crml_TypeOfLicenseAxis_2171" xlink:to="crml_TypeOfLicenseDomainDomain_2172" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_2175" xlink:to="ifrs-full_ProportionOfOwnershipInterestInAssociate_2176" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_2175" xlink:to="crml_NumberOfLicenses_2177" />
    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_2175" xlink:to="crml_DateOfLicensesValidity_2178" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_2167" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_2168_default" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="crml_TypeOfLicenseAxis_2171" xlink:to="crml_TypeOfLicenseDomainDomain_2172_default" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://example.com/20260630/role/SummaryofMaterialAccountingPoliciesScheduleofNewAccountingStandardsandInterpretationsDetails" xlink:type="extended" xlink:title="definitionLink">
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IFRS18PresentationAndDisclosureInFinancialStatementsMember" xlink:label="crml_IFRS18PresentationAndDisclosureInFinancialStatementsMember_1416" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IFRS9PresentationAndDisclosureInFinancialStatementsMember" xlink:label="crml_IFRS9PresentationAndDisclosureInFinancialStatementsMember_1415" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain" xlink:label="ifrs-full_NewIFRSsDomain_2660" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_SummaryofMaterialAccountingPoliciesScheduleofNewAccountingStandardsandInterpretationsDetailsLineItems" xlink:label="crml_SummaryofMaterialAccountingPoliciesScheduleofNewAccountingStandardsandInterpretationsDetailsLineItems_1417" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfNatureOfChangeInAccountingPolicy" xlink:label="ifrs-full_DescriptionOfNatureOfChangeInAccountingPolicy_1418" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_DescriptionOfApplicationDateOfStandard" xlink:label="crml_DescriptionOfApplicationDateOfStandard_1419" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DateByWhichApplicationOfNewIFRSIsRequired" xlink:label="ifrs-full_DateByWhichApplicationOfNewIFRSIsRequired_1420" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ScheduleOfNewAccountingStandardsAndInterpretationsAbstract" xlink:label="crml_ScheduleOfNewAccountingStandardsAndInterpretationsAbstract_1412" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_SummaryofMaterialAccountingPoliciesScheduleofNewAccountingStandardsandInterpretationsDetailsTable" xlink:label="crml_SummaryofMaterialAccountingPoliciesScheduleofNewAccountingStandardsandInterpretationsDetailsTable_1413" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_GEMMember" xlink:label="crml_GEMMember_1512" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2663" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExpensesfromContinuingOperationsScheduleofListingExpensesParentheticalsDetailsTable" xlink:label="crml_ExpensesfromContinuingOperationsScheduleofListingExpensesParentheticalsDetailsTable_1510" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IssueOfSharesToSettleFinancingCost" xlink:label="crml_IssueOfSharesToSettleFinancingCost_1514" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_VesselMember" xlink:label="crml_VesselMember_1578" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BuildingsMember" xlink:label="ifrs-full_BuildingsMember_1579" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_CampMember" xlink:label="crml_CampMember_1580" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="ifrs-full_CarryingAmountMember_1569" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="ifrs-full_GrossCarryingAmountMember_1570" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:label="ifrs-full_AccumulatedDepreciationAndAmortisationMember_1571" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_NetOfAccumulatedDepreciationMember" xlink:label="crml_NetOfAccumulatedDepreciationMember_1572" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_1581" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OfficeEquipment" xlink:label="ifrs-full_OfficeEquipment_1582" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_BalanceAtAcquisitionsOfTanbreez" xlink:label="crml_BalanceAtAcquisitionsOfTanbreez_1584" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_1585" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:label="ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_1586" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ScheduleOfPropertyAndPlantAndEquipmentAbstract" xlink:label="crml_ScheduleOfPropertyAndPlantAndEquipmentAbstract_1566" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_PropertyandPlantandEquipmentScheduleofPropertyandPlantandEquipmentDetailsTable" xlink:label="crml_PropertyandPlantandEquipmentScheduleofPropertyandPlantandEquipmentDetailsTable_1567" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1573" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_InventoryNetScheduleofInventoryNetDetailsTable" xlink:label="crml_InventoryNetScheduleofInventoryNetDetailsTable_1592" />
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    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ifrs-full_ClassesOfAssetsAxis_1593" xlink:to="ifrs-full_ClassesOfAssetsDomain_1594" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember_2206" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AT" xlink:label="country_AT_2201" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US" xlink:label="country_US_2202" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB" xlink:label="country_GB_2203" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis_2204" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_2205" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IncomeTaxLineItems" xlink:label="crml_IncomeTaxLineItems_2207" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ApplicableTaxRate" xlink:label="ifrs-full_ApplicableTaxRate_2208" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_DeferredTaxAssetRate" xlink:label="crml_DeferredTaxAssetRate_2209" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxesPaidRefundAbstract" xlink:label="ifrs-full_IncomeTaxesPaidRefundAbstract_2197" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IncomeTaxDetailsTable" xlink:label="crml_IncomeTaxDetailsTable_2198" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_2199" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2200" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_TaxableIncomeRate" xlink:label="crml_TaxableIncomeRate_2210" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_incomeTaxRate" xlink:label="crml_incomeTaxRate_2211" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_DeferredTaxAsset" xlink:label="crml_DeferredTaxAsset_2212" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:label="ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_2213" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_2205_default" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2200_default" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_RangeDomain_2205" xlink:to="ifrs-full_TopOfRangeMember_2206" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain_2200" xlink:to="country_AT_2201" />
    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain_2200" xlink:to="country_US_2202" />
    <link:definitionArc xlink:type="arc" order="13.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain_2200" xlink:to="country_GB_2203" />
    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="crml_IncomeTaxDetailsTable_2198" xlink:to="ifrs-full_RangeAxis_2204" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ifrs-full_RangeAxis_2204" xlink:to="ifrs-full_RangeDomain_2205" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="ifrs-full_ApplicableTaxRate_2208" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="crml_DeferredTaxAssetRate_2209" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="true" use="optional" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="crml_IncomeTaxDetailsTable_2198" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="crml_IncomeTaxDetailsTable_2198" xlink:to="ifrs-full_CategoriesOfRelatedPartiesAxis_2199" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_2199" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_2200" />
    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="crml_TaxableIncomeRate_2210" />
    <link:definitionArc xlink:type="arc" order="13.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="crml_incomeTaxRate_2211" />
    <link:definitionArc xlink:type="arc" order="14.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="crml_DeferredTaxAsset_2212" />
    <link:definitionArc xlink:type="arc" order="15.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_IncomeTaxLineItems_2207" xlink:to="ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_2213" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_RangeAxis_2204" xlink:to="ifrs-full_RangeDomain_2205_default" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_2199" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_2200_default" />
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  <link:definitionLink xlink:role="http://example.com/20260630/role/InventoryNetDetails" xlink:type="extended" xlink:title="definitionLink">
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_AssetSaleAgreementMember" xlink:label="crml_AssetSaleAgreementMember_2230" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_CopperMember" xlink:label="crml_CopperMember_2233" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotesAndOtherExplanatoryInformationAbstract" xlink:label="ifrs-full_NotesAndOtherExplanatoryInformationAbstract_2226" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_InventoryNetDetailsTable" xlink:label="crml_InventoryNetDetailsTable_2227" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_2228" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2229" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ifrs-full_ProductsAndServicesAxis_2231" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain_2232" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_InventoryNetDetailsLineItems" xlink:label="crml_InventoryNetDetailsLineItems_2234" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssued" xlink:label="ifrs-full_NumberOfSharesIssued_2235" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IssueOfSharesAcquisitionOfCopperAmount" xlink:label="crml_IssueOfSharesAcquisitionOfCopperAmount_2236" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_NoOfSharesIssueOfSharesAcquisitionOfCopper" xlink:label="crml_NoOfSharesIssueOfSharesAcquisitionOfCopper_2237" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ParValuePerShare" xlink:label="ifrs-full_ParValuePerShare_2238" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2229_default" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain_2232_default" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain_2229" xlink:to="crml_AssetSaleAgreementMember_2230" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_ProductsAndServicesDomain_2232" xlink:to="crml_CopperMember_2233" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="true" use="optional" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="crml_InventoryNetDetailsLineItems_2234" xlink:to="crml_InventoryNetDetailsTable_2227" />
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    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="crml_InventoryNetDetailsTable_2227" xlink:to="ifrs-full_ProductsAndServicesAxis_2231" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ifrs-full_ProductsAndServicesAxis_2231" xlink:to="ifrs-full_ProductsAndServicesDomain_2232" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_InventoryNetDetailsLineItems_2234" xlink:to="ifrs-full_NumberOfSharesIssued_2235" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_InventoryNetDetailsLineItems_2234" xlink:to="crml_IssueOfSharesAcquisitionOfCopperAmount_2236" />
    <link:definitionArc xlink:type="arc" order="12.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_InventoryNetDetailsLineItems_2234" xlink:to="crml_NoOfSharesIssueOfSharesAcquisitionOfCopper_2237" />
    <link:definitionArc xlink:type="arc" order="13.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_InventoryNetDetailsLineItems_2234" xlink:to="ifrs-full_ParValuePerShare_2238" />
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  <link:definitionLink xlink:role="http://example.com/20260630/role/RestrictedCashandOtherDepositsDetails" xlink:type="extended" xlink:title="definitionLink">
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_BMWMember" xlink:label="crml_BMWMember_2219" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_AccruedInterest" xlink:label="crml_AccruedInterest_2222" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepositLiabilities" xlink:label="ifrs-full_DepositLiabilities_2223" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedCashAndCashEquivalents" xlink:label="ifrs-full_RestrictedCashAndCashEquivalents_2224" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_FundsTransferred" xlink:label="crml_FundsTransferred_2221" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_RestrictedCashAndOtherDepositsAbstract" xlink:label="crml_RestrictedCashAndOtherDepositsAbstract_2215" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_RestrictedCashandOtherDepositsDetailsTable" xlink:label="crml_RestrictedCashandOtherDepositsDetailsTable_2216" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_2217" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2218" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_RestrictedCashAndOtherDepositsLineItems" xlink:label="crml_RestrictedCashAndOtherDepositsLineItems_2220" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2218_default" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain_2218" xlink:to="crml_BMWMember_2219" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="crml_RestrictedCashAndOtherDepositsLineItems_2220" xlink:to="crml_AccruedInterest_2222" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_CMRLMember" xlink:label="crml_CMRLMember_2246" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_Stage1InterestMember" xlink:label="crml_Stage1InterestMember_2249" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_SixtyNorthGreenlandApSMember" xlink:label="crml_SixtyNorthGreenlandApSMember_2693" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_2242" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_OrdinarySharesToAcquire" xlink:label="crml_OrdinarySharesToAcquire_2260" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfJointVenturesAbstract" xlink:label="ifrs-full_DisclosureOfJointVenturesAbstract_2240" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfJointVenturesLineItems" xlink:label="ifrs-full_DisclosureOfJointVenturesLineItems_2250" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentIncome" xlink:label="ifrs-full_InvestmentIncome_2252" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReturnOnReimbursementRights" xlink:label="ifrs-full_ReturnOnReimbursementRights_2255" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ParValuePerShare" xlink:label="ifrs-full_ParValuePerShare_2258" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_IssuedCapitalRate" xlink:label="crml_IssuedCapitalRate_2251" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_EquityInterestRate" xlink:label="crml_EquityInterestRate_2253" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_CashPayment" xlink:label="crml_CashPayment_2694" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_CRMLSharesValue" xlink:label="crml_CRMLSharesValue_2695" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_CRMLsClosingSharePrice" xlink:label="crml_CRMLsClosingSharePrice_2696" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_BonusValue" xlink:label="crml_BonusValue_2697" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_MajorityVoteRequiredPercentage" xlink:label="crml_MajorityVoteRequiredPercentage_2698" />
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    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="true" use="optional" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="ifrs-full_DisclosureOfJointVenturesLineItems_2250" xlink:to="crml_InvestmentinJointVentureDetailsTable_2241" />
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    <link:definitionArc xlink:type="arc" order="13.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="crml_ShareBasedPaymentDetailsTable_2370" xlink:to="ifrs-full_CategoriesOfRelatedPartiesAxis_2381" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_TypesOfAntidilutiveInstrumentsAxis_2371" xlink:to="ifrs-full_TypesOfAntidilutiveInstrumentsDomain_2372_default" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_2381" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_2382_default" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_2386" xlink:to="ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_2387_default" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_2376" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_2377_default" />
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  <link:definitionLink xlink:role="http://example.com/20260630/role/CommitmentsandContingenciesDetails" xlink:type="extended" xlink:title="definitionLink">
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember" xlink:label="ifrs-full_OrdinarySharesMember_2405" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_EuropeanLithiumLtdMember" xlink:label="crml_EuropeanLithiumLtdMember_2408" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesAbstract" xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesAbstract_2401" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2410" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesLineItems_2412" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_NetCashAndLiquidAssets" xlink:label="crml_NetCashAndLiquidAssets_2413" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ReimbursementFee" xlink:label="crml_ReimbursementFee_2414" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssued" xlink:label="ifrs-full_NumberOfSharesIssued_2415" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_NumberOfWarrantsIssued" xlink:label="crml_NumberOfWarrantsIssued_2416" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis" xlink:label="ifrs-full_ClassesOfShareCapitalAxis_2403" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain" xlink:label="ifrs-full_ClassesOfShareCapitalDomain_2404" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="ifrs-full_BusinessCombinationsAxis_2406" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain_2407" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_2409" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_WarrantsExercisable" xlink:label="crml_WarrantsExercisable_2417" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_WarrantExercisableTerms" xlink:label="crml_WarrantExercisableTerms_2418" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_BankGuarantees" xlink:label="crml_BankGuarantees_2419" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_2410_default" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain" xlink:label="ifrs-full_ClassesOfShareCapitalDomain_2404_default" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain_2407_default" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain_2410" xlink:to="crml_SkylongAssetsLimitedSkylongMember_2411" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_ClassesOfShareCapitalDomain_2404" xlink:to="ifrs-full_OrdinarySharesMember_2405" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_BusinessCombinationsDomain_2407" xlink:to="crml_EuropeanLithiumLtdMember_2408" />
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    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfContingentLiabilitiesLineItems_2412" xlink:to="crml_ReimbursementFee_2414" />
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    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ifrs-full_BusinessCombinationsAxis_2406" xlink:to="ifrs-full_BusinessCombinationsDomain_2407" />
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    <link:definitionArc xlink:type="arc" order="14.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfContingentLiabilitiesLineItems_2412" xlink:to="crml_WarrantsExercisable_2417" />
    <link:definitionArc xlink:type="arc" order="15.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfContingentLiabilitiesLineItems_2412" xlink:to="crml_WarrantExercisableTerms_2418" />
    <link:definitionArc xlink:type="arc" order="16.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_DisclosureOfContingentLiabilitiesLineItems_2412" xlink:to="crml_BankGuarantees_2419" />
    <link:definitionArc xlink:type="arc" order="10.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_2409" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_2410_default" />
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    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExecutivesAdvisorsAndNonExecutiveDirectorsThreeMember" xlink:label="crml_ExecutivesAdvisorsAndNonExecutiveDirectorsThreeMember_1914" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExecutivesOneMember" xlink:label="crml_ExecutivesOneMember_1908" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExecutivesTwoMember" xlink:label="crml_ExecutivesTwoMember_1909" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_AdvisorsMember" xlink:label="crml_AdvisorsMember_1910" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_NonExecutiveDirectorsMember" xlink:label="crml_NonExecutiveDirectorsMember_1911" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExecutivesAdvisorsAndNonExecutiveDirectorsMember" xlink:label="crml_ExecutivesAdvisorsAndNonExecutiveDirectorsMember_1912" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExecutivesAdvisorsAndNonExecutiveDirectorsTwoMember" xlink:label="crml_ExecutivesAdvisorsAndNonExecutiveDirectorsTwoMember_1913" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ExecutivesMember" xlink:label="crml_ExecutivesMember_1907" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_2674" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ShareBasedPaymentScheduleofTradingPriceontheDateofIssuewiththeOverallCosttobeSpreadOvertheVestingPeriodDetailsLineItems" xlink:label="crml_ShareBasedPaymentScheduleofTradingPriceontheDateofIssuewiththeOverallCosttobeSpreadOvertheVestingPeriodDetailsLineItems_1915" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_1916" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDate" xlink:label="crml_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDate_1917" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_SharebasedCompensationArrangementBySharebasedPaymentGrantDateFairValue" xlink:label="crml_SharebasedCompensationArrangementBySharebasedPaymentGrantDateFairValue_1918" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingDate" xlink:label="crml_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingDate_1919" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ShareBasedCompensationArrangementByShareBasedPaymentSharePriceHurdle" xlink:label="crml_ShareBasedCompensationArrangementByShareBasedPaymentSharePriceHurdle_1920" />
    <link:loc xlink:type="locator" xlink:href="crml-20260630.xsd#crml_ScheduleOfTradingPriceOnTheDateOfIssueWithTheOverallCostToBeSpreadOverTheVestingPeriodAbstract" xlink:label="crml_ScheduleOfTradingPriceOnTheDateOfIssueWithTheOverallCostToBeSpreadOverTheVestingPeriodAbstract_1904" />
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    <link:definitionArc xlink:type="arc" order="17.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_2674" xlink:to="crml_ExecutivesAdvisorsAndNonExecutiveDirectorsThreeMember_1914" />
    <link:definitionArc xlink:type="arc" order="11.00000" priority="1" xbrldt:closed="false" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_2674" xlink:to="crml_ExecutivesOneMember_1908" />
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