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  <element name="WeightedAverageExercisePricesMember" id="idr_WeightedAverageExercisePricesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="StockOptionsMember" id="idr_StockOptionsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TwoZeroTwoSixMember" id="idr_TwoZeroTwoSixMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="ButteHighlandsJvLlcMember" id="idr_ButteHighlandsJvLlcMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="NewJerseyMillMember" id="idr_NewJerseyMillMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="SilverMember" id="idr_SilverMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="ConcentrateSalesToHAndHMember" id="idr_ConcentrateSalesToHAndHMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="DoreSalesToRefineriesMember" id="idr_DoreSalesToRefineriesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="NotePayableMember" id="idr_NotePayableMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="BuildingsLandMember" id="idr_BuildingsLandMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="DueWithinOneYearMember" id="idr_DueWithinOneYearMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="DueOneYearToFiveYearsMember" id="idr_DueOneYearToFiveYearsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
</schema>
