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  <element id="hnrg_PercentageOfProfitUntilCapitalInvestmentAndInterestIsReturned" name="PercentageOfProfitUntilCapitalInvestmentAndInterestIsReturned" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hnrg_PercentageOfProfitAfterCapitalInvestmentAndInterestIsReturned" name="PercentageOfProfitAfterCapitalInvestmentAndInterestIsReturned" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hnrg_AggregateInsuranceDeductibleForEmployees" name="AggregateInsuranceDeductibleForEmployees" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hnrg_GeographicSpreadOfMiningUnits" name="GeographicSpreadOfMiningUnits" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hnrg_MiningPropertiesPolicyTextBlock" name="MiningPropertiesPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xs:schema>
