<?xml version="1.0" encoding="utf-8"?>
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<!--Based on XBRL 2.1-->
<!--Created on: 6/4/2026 10:37:17 AM-->
<!--Modified on: 6/4/2026 10:37:17 AM-->
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  <xsd:import namespace="http://xbrl.sec.gov/rxp/2025" schemaLocation="https://xbrl.sec.gov/rxp/2025/rxp-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/snj/2025" schemaLocation="https://xbrl.sec.gov/snj/2025/snj-2025.xsd" />
  <xsd:element name="StibniteGoldProjectMember" id="ppta_StibniteGoldProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="StateOfIdahoDepartmentOfLandsMember" id="ppta_StateOfIdahoDepartmentOfLandsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="GovernmentOfUnitedStatesOfAmericaUnitedStatesEnvironmentalProtectionAgencyMember" id="ppta_GovernmentOfUnitedStatesOfAmericaUnitedStatesEnvironmentalProtectionAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="GovernmentOfUnitedStatesOfAmericaBureauOfLandManagementMember" id="ppta_GovernmentOfUnitedStatesOfAmericaBureauOfLandManagementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="StateOfIdahoIdahoDepartmentOfEnvironmentalQualityMember" id="ppta_StateOfIdahoIdahoDepartmentOfEnvironmentalQualityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NezPerceTribeSouthForkSalmonWaterQualityEnhancementFundMember" id="ppta_NezPerceTribeSouthForkSalmonWaterQualityEnhancementFundMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="GovernmentOfUnitedStatesOfAmericaUnitedStatesForestServiceMember" id="ppta_GovernmentOfUnitedStatesOfAmericaUnitedStatesForestServiceMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
