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  <xsd:element id="gte_IncreaseDecreaseInAccountsReceivableAndOtherLongTermAssets" name="IncreaseDecreaseInAccountsReceivableAndOtherLongTermAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="gte_IncreaseDecreaseinAccountsPayableAccruedLiabilitiesandOtherLiabilities" name="IncreaseDecreaseinAccountsPayableAccruedLiabilitiesandOtherLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="gte_IncrementalCommonSharesIssuablePursuantToWarrants" name="IncrementalCommonSharesIssuablePursuantToWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_LineOfCreditFacilityCovenantsDividendsPaymentsAllowableMaximumWithoutApproval" name="LineOfCreditFacilityCovenantsDividendsPaymentsAllowableMaximumWithoutApproval" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="gte_LossContingencyLossInPeriodBarrelsOfOil" name="LossContingencyLossInPeriodBarrelsOfOil" nillable="true" substitutionGroup="xbrli:item" type="num:volumeItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_MecayaBlockMember" name="MecayaBlockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NonCashWorkingCapitalAndNetAssetsAndLiabilitiesRelatedToCapitalAdditions" name="NonCashWorkingCapitalAndNetAssetsAndLiabilitiesRelatedToCapitalAdditions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="gte_NumberOfBlocks" name="NumberOfBlocks" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NumberOfCommonVotingSharesPerExchangeableShare" name="NumberOfCommonVotingSharesPerExchangeableShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NumberOfFarmoutAgreements" name="NumberOfFarmoutAgreements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NumberOfProducingBlocks" name="NumberOfProducingBlocks" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NumberOfProducingWells" name="NumberOfProducingWells" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NumberOfSubsidiariesUsedAsCollateralForReserveBasedFacility" name="NumberOfSubsidiariesUsedAsCollateralForReserveBasedFacility" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="gte_NumberOfVotesPerCommonStock" name="NumberOfVotesPerCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_NumberofBlocksSuccessfullyBid" name="NumberofBlocksSuccessfullyBid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OilAndGasPropertiesUsingFullCostMethodOfAccountingAbstract" name="OilAndGasPropertiesUsingFullCostMethodOfAccountingAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_OilAndGasPropertyCostsTransferredToDepletableBaseWithinFiveYearsPercentage" name="OilAndGasPropertyCostsTransferredToDepletableBaseWithinFiveYearsPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="gte_OilAndGasPropertyTransferOfCostsToDepletableBaseTimePeriod" name="OilAndGasPropertyTransferOfCostsToDepletableBaseTimePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OilGasGasPropertyPlantAndEquipmentAxis" name="OilGasGasPropertyPlantAndEquipmentAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OilGasGasPropertyPlantAndEquipmentDomain" name="OilGasGasPropertyPlantAndEquipmentDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OilTransportationServicesMember" name="OilTransportationServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_OilandGasPropertiesWorkingInterestSoldPercentage" name="OilandGasPropertiesWorkingInterestSoldPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OilandGaspropertyplantandequipmentAxis" name="OilandGaspropertyplantandequipmentAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OilandGaspropertyplantandequipmentDomain" name="OilandGaspropertyplantandequipmentDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_OperatingLeasesMember" name="OperatingLeasesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_OperatingLossCarryforwardsForeignOperations" name="OperatingLossCarryforwardsForeignOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="gte_OtherAccountsReceivableMember" name="OtherAccountsReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_OtherCurrentAndNoncurrentAssets" name="OtherCurrentAndNoncurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="gte_OtherCustomerNumberTwoMember" name="OtherCustomerNumberTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ParticipatingInterestPercentageOilAndGasProperty" name="ParticipatingInterestPercentageOilAndGasProperty" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ParticipatingInterestPercentageOilAndGasPropertyRemainingPercentage" name="ParticipatingInterestPercentageOilAndGasPropertyRemainingPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_PaymentsforInvestingActivitiesDiscontinuedOperations" name="PaymentsforInvestingActivitiesDiscontinuedOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="gte_PaymentstoAcquireOilandGasPropertySignatureBonus" name="PaymentstoAcquireOilandGasPropertySignatureBonus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_PendingLitigationMoquetaDiscoveryMember" name="PendingLitigationMoquetaDiscoveryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_PendingLitigationMoquetaDiscoveryTransportationAndRelatedCostsMember" name="PendingLitigationMoquetaDiscoveryTransportationAndRelatedCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ProceedsfromOilandGasPropertyfromTerminationofFarminAgreement" name="ProceedsfromOilandGasPropertyfromTerminationofFarminAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_PropertyPlantAndEquipmentCostCenterCategoriesAxis" name="PropertyPlantAndEquipmentCostCenterCategoriesAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_PropertyPlantAndEquipmentCostCenterCategoriesDomain" name="PropertyPlantAndEquipmentCostCenterCategoriesDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_PropertyPlantandEquipmentDisclosureofCompositeDepreciationRateforOtherCapitalAssets" name="PropertyPlantandEquipmentDisclosureofCompositeDepreciationRateforOtherCapitalAssets" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ProvedOilAndGasPropertiesFullCostAccounting" name="ProvedOilAndGasPropertiesFullCostAccounting" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="gte_ProvedOilandGasPropertiesMember" name="ProvedOilandGasPropertiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeases" name="PurchaseObligationsFirmAgreementsAndLeases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeasesDueAfterFiveYears" name="PurchaseObligationsFirmAgreementsAndLeasesDueAfterFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeasesDueInNextTwelveMonths" name="PurchaseObligationsFirmAgreementsAndLeasesDueInNextTwelveMonths" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeasesDueWithinFiveYears" name="PurchaseObligationsFirmAgreementsAndLeasesDueWithinFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeasesDueWithinFourYears" name="PurchaseObligationsFirmAgreementsAndLeasesDueWithinFourYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeasesDueWithinThreeYears" name="PurchaseObligationsFirmAgreementsAndLeasesDueWithinThreeYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchaseObligationsFirmAgreementsAndLeasesDueWithinTwoYears" name="PurchaseObligationsFirmAgreementsAndLeasesDueWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_PurchasePriceForParticipationInOilAndGasProperty" name="PurchasePriceForParticipationInOilAndGasProperty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="gte_ScheduleOfContractualObligationsFutureLeasePaymentsTableTextBlock" name="ScheduleOfContractualObligationsFutureLeasePaymentsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ScheduleofFairValueContingentAssetsandLiabilitiesTableTextBlock" name="ScheduleofFairValueContingentAssetsandLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_SegmentAndGeographicReportingConcentrationRiskAbstract" name="SegmentAndGeographicReportingConcentrationRiskAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ShareBasedCompensationOptionWarrantsAndIncentivePlansPolicyPolicyTextBlock" name="ShareBasedCompensationOptionWarrantsAndIncentivePlansPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_SharebasedCompensationArrangementbySharebasedPaymentAwardExpirationPeriodAfterLeavingServiceofCompany" name="SharebasedCompensationArrangementbySharebasedPaymentAwardExpirationPeriodAfterLeavingServiceofCompany" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_SharesToBePurchasedFromProceedsOfStockOptions" name="SharesToBePurchasedFromProceedsOfStockOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_SoftwareAndTelecommunicationMember" name="SoftwareAndTelecommunicationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_SolanaMember" name="SolanaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_SpecialVotingStockAuthorized" name="SpecialVotingStockAuthorized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="gte_SpecialVotingStockParValue" name="SpecialVotingStockParValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="gte_StockOptionsAbstract" name="StockOptionsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_SummaryOfOilAndNaturalGasPropertiesCostAndAccumulatedDepletionTableTextBlock" name="SummaryOfOilAndNaturalGasPropertiesCostAndAccumulatedDepletionTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxPeriodAxis" name="TaxPeriodAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxPeriodDomain" name="TaxPeriodDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxYear2015Member" name="TaxYear2015Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxYear2016Member" name="TaxYear2016Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxYear2017Member" name="TaxYear2017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxYear2018Member" name="TaxYear2018Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_TaxYear2019andThereafterMember" name="TaxYear2019andThereafterMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_ThresholdByWhichAdditionalRoyaltyDue" name="ThresholdByWhichAdditionalRoyaltyDue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_TotalCumulativeProductionOfOilFieldInBarrelsMillions" name="TotalCumulativeProductionOfOilFieldInBarrelsMillions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_TotalOtherLongTermAssets" name="TotalOtherLongTermAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="gte_TotalRevenueAndOtherIncome" name="TotalRevenueAndOtherIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_UnprovedOilAndGasPropertiesMember" name="UnprovedOilAndGasPropertiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_UnprovedOilAndGasPropertyFullCostAccounting" name="UnprovedOilAndGasPropertyFullCostAccounting" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="gte_WarrantExpiredUnexercised" name="WarrantExpiredUnexercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_WarrantsAbstract" name="WarrantsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_WarrantsExercisedCashlessExchange" name="WarrantsExercisedCashlessExchange" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_WarrantsExercisedShares" name="WarrantsExercisedShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_WarrantsExercisedValue" name="WarrantsExercisedValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="gte_WarrantsExpirationDateRangeEnd" name="WarrantsExpirationDateRangeEnd" nillable="true" substitutionGroup="xbrli:item" type="xbrli:dateItemType" xbrli:periodType="duration" />
  <xsd:element id="gte_WarrantsExpirationDateRangeStart" name="WarrantsExpirationDateRangeStart" nillable="true" substitutionGroup="xbrli:item" type="xbrli:dateItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="gte_WellsFargoBankNAMember" name="WellsFargoBankNAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>


