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  <xsd:element name="MountaineerGatheringAndCompressionAgreementMember" id="am_MountaineerGatheringAndCompressionAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2024Q3DividendsMember" id="am_O2024Q3DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ThresholdTimePeriodRelatedToCreditFacilityMaturityDate" id="am_ThresholdTimePeriodRelatedToCreditFacilityMaturityDate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="LitigationSettlementAmountAwardedFromOtherPartyForAttorneyFeesAndCosts" id="am_LitigationSettlementAmountAwardedFromOtherPartyForAttorneyFeesAndCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ConsolidatedInterestCoverageRatio" id="am_ConsolidatedInterestCoverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ConsolidatedLeverageRatio" id="am_ConsolidatedLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ExerciseOfFinancialCovenantElectionMember" id="am_ExerciseOfFinancialCovenantElectionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AfterEffectOfFinancialCovenantElectionMember" id="am_AfterEffectOfFinancialCovenantElectionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ConsolidatedSeniorSecuredLeverageRatio" id="am_ConsolidatedSeniorSecuredLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentFloorRate" id="am_DebtInstrumentFloorRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="O2024Q4DividendsMember" id="am_O2024Q4DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2025Q1DividendsMember" id="am_O2025Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PerformanceShareUnitAwardsBasedOnReturnOnInvestedCapital2025Member" id="am_PerformanceShareUnitAwardsBasedOnReturnOnInvestedCapital2025Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2025Q2DividendsMember" id="am_O2025Q2DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SeniorNotesDue2033Bearing5.75RateMember" id="am_SeniorNotesDue2033Bearing5.75RateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2025Q3DividendsMember" id="am_O2025Q3DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
