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  <xsd:element name="LitigationSettlementAmendedAmountAwardedFromOtherParty" id="am_LitigationSettlementAmendedAmountAwardedFromOtherParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PaymentsToAcquireInterestInJointVentureAdditionalInvestment" id="am_PaymentsToAcquireInterestInJointVentureAdditionalInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="SeniorNotesDue2032Bearing6.625RateMember" id="am_SeniorNotesDue2032Bearing6.625RateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PerformanceShareUnitAwardsBasedOnReturnOnInvestedCapital2023Member" id="am_PerformanceShareUnitAwardsBasedOnReturnOnInvestedCapital2023Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="MinimumPrincipalExpectedToBeOutstandingAsMaturityCovenant" id="am_MinimumPrincipalExpectedToBeOutstandingAsMaturityCovenant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ThresholdPercentageOfUnrestrictedCashUsageForAggregateCommitments.ConsideredAsMaturityCovenant" id="am_ThresholdPercentageOfUnrestrictedCashUsageForAggregateCommitments.ConsideredAsMaturityCovenant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="RevenueFromContractWithCustomerObligationTerm" id="am_RevenueFromContractWithCustomerObligationTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="RevenueFromContractWithCustomerObligationCommencingPeriod" id="am_RevenueFromContractWithCustomerObligationCommencingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="MountaineerGatheringAndCompressionAgreementMember" id="am_MountaineerGatheringAndCompressionAgreementMember" 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="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:element name="UticaShalePropertyAndEquipmentMember" id="am_UticaShalePropertyAndEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AcquisitionsAndDispositionsDisclosuresAbstract" id="am_AcquisitionsAndDispositionsDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HgAcquisitionAndUpstreamAcquisitionMember" id="am_HgAcquisitionAndUpstreamAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HgEnergyIiMidstreamHoldingsLlcMember" id="am_HgEnergyIiMidstreamHoldingsLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PaymentsInEscrowAccount" id="am_PaymentsInEscrowAccount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NumberOfWaterImpoundments" id="am_NumberOfWaterImpoundments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="StorageCapacityOfWaterImpoundments" id="am_StorageCapacityOfWaterImpoundments" type="dtr-types:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="SeniorNotesDue2034Bearing5.75RateMember" id="am_SeniorNotesDue2034Bearing5.75RateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfMilesOfWaterPipelines" id="am_NumberOfMilesOfWaterPipelines" type="dtr-types:lengthItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfMilesOfGatheringPipelines" id="am_NumberOfMilesOfGatheringPipelines" type="dtr-types:lengthItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="O2025Q4DividendsMember" id="am_O2025Q4DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="MichaelN.KennedyMember" id="am_MichaelN.KennedyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="GatheringMember" id="am_GatheringMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAsset" id="am_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="BusinessCombinationRecognizedLiabilityAssumedAccruedLiabilitiesCurrent" id="am_BusinessCombinationRecognizedLiabilityAssumedAccruedLiabilitiesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageCostOfCapitalUsedInValuation" id="am_WeightedAverageCostOfCapitalUsedInValuation" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="O2026Q1DividendsMember" id="am_O2026Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LeaseDisclosureTextBlock" id="am_LeaseDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="OperatingLeaseAbstract" id="am_OperatingLeaseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FinanceLeaseAbstract" id="am_FinanceLeaseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" id="am_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidFiscalYearMaturityAbstract" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidFiscalYearMaturityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidRemainderOfFiscalYear" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidRemainderOfFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearOne" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearTwo" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearThree" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearFour" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidAfterYearFour" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidToBePaid" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidToBePaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidUndiscountedExcessAmount" id="am_LesseeOperatingLeaseAndFinanceLeaseLiabilityToBePaidUndiscountedExcessAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="OperatingLeaseAndFinanceLeaseLiability" id="am_OperatingLeaseAndFinanceLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LeaseLiabilityCurrent" id="am_LeaseLiabilityCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LeaseLiabilityNoncurrent" id="am_LeaseLiabilityNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NaturalGasGatheringTransportationMarketingAndProcessingThirdPartyMember" id="am_NaturalGasGatheringTransportationMarketingAndProcessingThirdPartyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PaymentsOfCapitalLeaseObligations" id="am_PaymentsOfCapitalLeaseObligations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PerformanceShareUnitAwardsBasedOnReturnOnInvestedCapital2026Member" id="am_PerformanceShareUnitAwardsBasedOnReturnOnInvestedCapital2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="BusinessCombinationProformaInformationSinceAcquisitionActualsTableTextBlock" id="am_BusinessCombinationProformaInformationSinceAcquisitionActualsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="BusinessCombinationAcquireeSOperatingRevenueSinceAcquisitionDateActual" id="am_BusinessCombinationAcquireeSOperatingRevenueSinceAcquisitionDateActual" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="BusinessCombinationAcquireeSAmortizationSinceAcquisitionDateActual" id="am_BusinessCombinationAcquireeSAmortizationSinceAcquisitionDateActual" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="GatheringAndCompressionAgreementMinimumCentralizedCompressionCapacityCommitmentPercentage" id="am_GatheringAndCompressionAgreementMinimumCentralizedCompressionCapacityCommitmentPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfThirdPartyBuyers" id="am_NumberOfThirdPartyBuyers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisposalGroupIncludingDiscontinuedOperationConsiderationNet" id="am_DisposalGroupIncludingDiscontinuedOperationConsiderationNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="O2026Q2DividendsMember" id="am_O2026Q2DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsAcquired" id="am_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilities" id="am_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilitiesAssumed" id="am_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilitiesAssumed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
</xsd:schema>
