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  <element id="gsm_CashAndCashEquivalentsFromContinuedOperations" name="CashAndCashEquivalentsFromContinuedOperations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AccumulatedValuationAdjustments" name="AccumulatedValuationAdjustments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DepreciationAndAmortizationChargesOperatingAllowancesAndWriteDowns" name="DepreciationAndAmortizationChargesOperatingAllowancesAndWriteDowns" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_EarningsPerShareContinuedAndDiscontinuedOperationsAbstract" name="EarningsPerShareContinuedAndDiscontinuedOperationsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ComponentsOfOtherComprehensiveIncomeThatHaveBeenReclassifiedToProfitOrLossNetOfTaxAbstract" name="ComponentsOfOtherComprehensiveIncomeThatHaveBeenReclassifiedToProfitOrLossNetOfTaxAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_OtherComprehensiveIncomeThatHasBeenReclassifiedToProfitOrLossNetOfTax" name="OtherComprehensiveIncomeThatHasBeenReclassifiedToProfitOrLossNetOfTax" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TaxEffectOfReclassificationAdjustmentsThatHaveBeenReclassifiedToProfitOrLoss" name="TaxEffectOfReclassificationAdjustmentsThatHaveBeenReclassifiedToProfitOrLoss" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TaxEffectOfIncentivesAndDeductions" name="TaxEffectOfIncentivesAndDeductions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_InventoryMember" name="InventoryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsOtherLiabilitiesAbstract" name="IfrsOtherLiabilitiesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_GuaranteesAndDepositsLiability" name="GuaranteesAndDepositsLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_RemunerationPayableCurrent" name="RemunerationPayableCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_RemunerationPayable" name="RemunerationPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TaxPayablesCurrent" name="TaxPayablesCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TaxPayables" name="TaxPayables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MiscellaneousOtherLiabilitiesNonCurrent" name="MiscellaneousOtherLiabilitiesNonCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MiscellaneousOtherLiabilitiesCurrent" name="MiscellaneousOtherLiabilitiesCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MiscellaneousOtherLiabilities" name="MiscellaneousOtherLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_CurrentPayablesOnPersonalIncomeTaxWithholding" name="CurrentPayablesOnPersonalIncomeTaxWithholding" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PayablesOnPersonalIncomeTaxWithholding" name="PayablesOnPersonalIncomeTaxWithholding" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_CurrentOtherTaxesPayable" name="CurrentOtherTaxesPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_OtherTaxesPayable" name="OtherTaxesPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsRestrictedStockUnitsRsuMember" name="IfrsRestrictedStockUnitsRsuMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsStockAppreciationRightsSarsMember" name="IfrsStockAppreciationRightsSarsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PercentageOfTotalShareholderReturnRelativeToComparatorGroupVestingCondition" name="PercentageOfTotalShareholderReturnRelativeToComparatorGroupVestingCondition" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PercentageOfTotalShareholderReturnRelativeToMetalAndMiningIndex" name="PercentageOfTotalShareholderReturnRelativeToMetalAndMiningIndex" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PercentageOfNetOperatingProfitAfterTaxVestingCondition" name="PercentageOfNetOperatingProfitAfterTaxVestingCondition" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PerformancePeriodRemainingAtGrantDate" name="PerformancePeriodRemainingAtGrantDate" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" name="IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" name="IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NumberOfShareOptionsVestedInShareBasedPaymentArrangement" name="NumberOfShareOptionsVestedInShareBasedPaymentArrangement" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NumberOfShareOptionsUnvestedInShareBasedPaymentArrangement" name="NumberOfShareOptionsUnvestedInShareBasedPaymentArrangement" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ExpenseFromShareBasedPaymentTransactionsWithEmployeesAfterTax" name="ExpenseFromShareBasedPaymentTransactionsWithEmployeesAfterTax" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_LiabilitiesFromShareBasedPaymentTransactions2011OtherCurrentLiabilities" name="LiabilitiesFromShareBasedPaymentTransactions2011OtherCurrentLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_VestingPercentageOfShareBasedAwards" name="VestingPercentageOfShareBasedAwards" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_VestingLifeOfShareBasedAwards" name="VestingLifeOfShareBasedAwards" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NumberOfOtherEquityInstrumentsCancelledInShareBasedPaymentArrangement" name="NumberOfOtherEquityInstrumentsCancelledInShareBasedPaymentArrangement" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_GuaranteesAndDepositsNonCurrent" name="GuaranteesAndDepositsNonCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NumberOfSharesExchangedUponBusinessCombination" name="NumberOfSharesExchangedUponBusinessCombination" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AdjustmentsForDepreciationAndAmortizationChargesOperatingAllowancesAndWriteDowns" name="AdjustmentsForDepreciationAndAmortizationChargesOperatingAllowancesAndWriteDowns" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssetsAbstract" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssetsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FinancialAssetsRecognisedAsOfAcquisitionDateNonCurrent" name="FinancialAssetsRecognisedAsOfAcquisitionDateNonCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAbstract" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" name="IfrsBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesAbstract" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAbstract" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ProvisionsRecognisedAsOfAcquisitionDateCurrent" name="ProvisionsRecognisedAsOfAcquisitionDateCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" name="IFRSBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsLossContingencyPendingClaimsNumber" name="IfrsLossContingencyPendingClaimsNumber" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfOtherLiabilitiesTableTextBlock" name="DisclosureOfOtherLiabilitiesTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfTaxPayablesTableTextBlock" name="DisclosureOfTaxPayablesTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfPerformanceConditionsOfShareOptionsGrantedTableTextBlock" name="DisclosureOfPerformanceConditionsOfShareOptionsGrantedTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfAssumptionsUsedForEstimationOfFairValueOfStockOptionsTableTextBlock" name="DisclosureOfAssumptionsUsedForEstimationOfFairValueOfStockOptionsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsScheduleOfInventoryCurrentTableTextBlock" name="IfrsScheduleOfInventoryCurrentTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" name="IfrsScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DescriptionOfAccountingPolicyForProvisionsAndContingenciesPolicyTextBlock" name="DescriptionOfAccountingPolicyForProvisionsAndContingenciesPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DescriptionOfAccountingPolicyForDeterminingCurrentAssetsAndLiabilitiesPolicyTextBlock" name="DescriptionOfAccountingPolicyForDeterminingCurrentAssetsAndLiabilitiesPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DescriptionOfAccountingPolicyForCo2EmissionAllowancesPolicyTextBlock" name="DescriptionOfAccountingPolicyForCo2EmissionAllowancesPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DescriptionOfAccountingPolicyForConsolidatedStatementOfCashFlowPolicyTextBlock" name="DescriptionOfAccountingPolicyForConsolidatedStatementOfCashFlowPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfUsefulLivesPropertyPlantAndEquipmentTableTextBlock" name="DisclosureOfUsefulLivesPropertyPlantAndEquipmentTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PropertiesForOwnUseMember" name="PropertiesForOwnUseMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PlantAndMachineryMember" name="PlantAndMachineryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ToolsMember" name="ToolsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsFurnitureAndFixturesMember" name="IfrsFurnitureAndFixturesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AmortisationPeriodOfIntangibleAssetsMaterialToEntity" name="AmortisationPeriodOfIntangibleAssetsMaterialToEntity" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfInformationAboutPropertyPlantAndEquipmentAbstract" name="DisclosureOfInformationAboutPropertyPlantAndEquipmentAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_UsefulLivesIntangibleAssetsPropertyPlantAndEquipment" name="UsefulLivesIntangibleAssetsPropertyPlantAndEquipment" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" name="IfrsScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsCashFlowsStatementTableTextBlock" name="ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsCashFlowsStatementTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_WeightedAverageSharesAbstract" name="WeightedAverageSharesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NetIncomeLossDilutedNumeratorAbstract" name="NetIncomeLossDilutedNumeratorAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" name="IfrsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_GeneralInformationAbstract" name="GeneralInformationAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfGeneralInformationAboutEntityTextBlock" name="DisclosureOfGeneralInformationAboutEntityTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfOrganizationAndSubsidiariesAbstract" name="DisclosureOfOrganizationAndSubsidiariesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfBasisOfPresentationAndBasisOfConsolidationAbstract" name="DisclosureOfBasisOfPresentationAndBasisOfConsolidationAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfBasisOfPresentationAndBasisOfConsolidationTextBlock" name="DisclosureOfBasisOfPresentationAndBasisOfConsolidationTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfCapitalStructureNetFinancialDebtTableTextBlock" name="DisclosureOfCapitalStructureNetFinancialDebtTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_LaterThanSixteenYearsAndNotLaterThanSeventeenYearsMember" name="LaterThanSixteenYearsAndNotLaterThanSeventeenYearsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_OtherWriteDownsAndReversals" name="OtherWriteDownsAndReversals" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PaymentsOfStampDuty" name="PaymentsOfStampDuty" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ShareRepurchasesAveragePricePaidPerShare" name="ShareRepurchasesAveragePricePaidPerShare" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_EuroInterbankOfferedRateEuriborMember" name="EuroInterbankOfferedRateEuriborMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ShareBasedPaymentArrangementSharesSubjectToPerformanceConditionsOutstanding" name="ShareBasedPaymentArrangementSharesSubjectToPerformanceConditionsOutstanding" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ProceedsFromSalesOfOtherAssetsClassifiedAsInvestingActivities" name="ProceedsFromSalesOfOtherAssetsClassifiedAsInvestingActivities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_DeferredTaxLiabilityAssetPriorYearChange" name="DeferredTaxLiabilityAssetPriorYearChange" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_BorrowingsGross" name="BorrowingsGross" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_CashEquivalentsAndCashMember" name="CashEquivalentsAndCashMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_FerroatlanticaDeBooSluMember" name="FerroatlanticaDeBooSluMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_LeaseLiabilitiesAdoptionOfIFRS16" name="LeaseLiabilitiesAdoptionOfIFRS16" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_RightOfUseAssetsGainLossOnCurrencyTranslation" name="RightOfUseAssetsGainLossOnCurrencyTranslation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_SpanishHydroelectricBusinessDisposalGroupAndDiscontinuedOperationMember" name="SpanishHydroelectricBusinessDisposalGroupAndDiscontinuedOperationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AssetBasedRevolvingCreditFacilityMember" name="AssetBasedRevolvingCreditFacilityMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_RepaymentTermOfRevolverPriorToMaturityDateOfSeniorUnsecuredNotes" name="RepaymentTermOfRevolverPriorToMaturityDateOfSeniorUnsecuredNotes" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_HidroelectricitDeSaintBeronS.a.sMember" name="HidroelectricitDeSaintBeronS.a.sMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_GrupoFerroatlnticaDeServiciosS.a.uMember" name="GrupoFerroatlnticaDeServiciosS.a.uMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_LeaseCashFlowInformationDisclosureTableTextBlock" name="LeaseCashFlowInformationDisclosureTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_LeaseOperationsInformationDisclosureTableTextBlock" name="LeaseOperationsInformationDisclosureTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfLeaseObligationsTableTextBlock" name="DisclosureOfLeaseObligationsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_CancellationOfCrossCurrencySwapMember" name="CancellationOfCrossCurrencySwapMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_LeasedLandAndBuildingsMember" name="LeasedLandAndBuildingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_LeasedPlantAndMachineryMember" name="LeasedPlantAndMachineryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IncreaseDecreaseInDefinedBenefitPlanAssetsDueToExchangeDifferences" name="IncreaseDecreaseInDefinedBenefitPlanAssetsDueToExchangeDifferences" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PropertyPlantAndEquipmentAdjustmentsOnAdoptionOfIFRS16" name="PropertyPlantAndEquipmentAdjustmentsOnAdoptionOfIFRS16" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_IfrsBalanceSheetLocationDomain" name="IfrsBalanceSheetLocationDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_CurrentLiabilitiesMember" name="CurrentLiabilitiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NoncurrentLiabilitiesMember" name="NoncurrentLiabilitiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_RestrictedCashMember" name="RestrictedCashMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_HidroNitroEspaolaS.a.Member" name="HidroNitroEspaolaS.a.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_ProvisionForLitigationFerroManganeseNorwayMember" name="ProvisionForLitigationFerroManganeseNorwayMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_CashAndCashEquivalentsAndRestrictedCash" name="CashAndCashEquivalentsAndRestrictedCash" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_CaixaGuaranteeReindusMember" name="CaixaGuaranteeReindusMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AblRevolverMember" name="AblRevolverMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_OtherRestrictedCashMember" name="OtherRestrictedCashMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_CashAvailableToPaySubordinatedLoans" name="CashAvailableToPaySubordinatedLoans" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_IfrsInventoryDomain" name="IfrsInventoryDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_InTransitInventoryMember" name="InTransitInventoryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ConsignmentInventoryMember" name="ConsignmentInventoryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_StoresAndSparePartsInventoryMember" name="StoresAndSparePartsInventoryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PackagingMaterialsInventoryMember" name="PackagingMaterialsInventoryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_FormulaAmountAsPercentageOfEligibleInventoryAndForeignInTransitInventory" name="FormulaAmountAsPercentageOfEligibleInventoryAndForeignInTransitInventory" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FormulaAmountAsPercentageOfAppraisedNetOrderlyLiquidationValueOfEligibleInventoryOverReserves" name="FormulaAmountAsPercentageOfAppraisedNetOrderlyLiquidationValueOfEligibleInventoryOverReserves" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gsm_FormulaAmountLimitInventoryAmount" name="FormulaAmountLimitInventoryAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FormulaAmountLimitReceivablesAmount" name="FormulaAmountLimitReceivablesAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsDebtInstrumentTerm" name="IfrsDebtInstrumentTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_SpringForwardRepaymentTerm" name="SpringForwardRepaymentTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsLineOfCreditFacilityRemainingBorrowingCapacity" name="IfrsLineOfCreditFacilityRemainingBorrowingCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AverageUundrawnAvailabilityPercentage" name="AverageUundrawnAvailabilityPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ReceivablesPledgedAsSecurityForLiabilities" name="ReceivablesPledgedAsSecurityForLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_UltracorePolskaZooSubsidiaryDisposalMember" name="UltracorePolskaZooSubsidiaryDisposalMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DomesticRateMember" name="DomesticRateMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsScenarioAxis" name="IfrsScenarioAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsScenarioDomain" name="IfrsScenarioDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_Level1ScenarioMember" name="Level1ScenarioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_Level2ScenarioMember" name="Level2ScenarioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_Level3ScenarioMember" name="Level3ScenarioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_OtherProvisionsOtherMember" name="OtherProvisionsOtherMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_OtherProvisionsProvisionsForTaxesMember" name="OtherProvisionsProvisionsForTaxesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AurinkaMember" name="AurinkaMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TradeAndOtherCurrentPayablesToRelatedPartiesIncludingDiscontinuedOperations" name="TradeAndOtherCurrentPayablesToRelatedPartiesIncludingDiscontinuedOperations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TradeAndOtherCurrentReceivablesDueFromRelatedPartiesDiscontinuedOperations" name="TradeAndOtherCurrentReceivablesDueFromRelatedPartiesDiscontinuedOperations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TradeReceivablesAuthorizedToBeSoldUnderSecuritizationProgram" name="TradeReceivablesAuthorizedToBeSoldUnderSecuritizationProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PercentageOfInterestOfSubsidiarySold" name="PercentageOfInterestOfSubsidiarySold" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FerroatlanticaS.a.u.Member" name="FerroatlanticaS.a.u.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_PeriodForContingentConsideration" name="PeriodForContingentConsideration" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FormulaAmountReceivablePeriod" name="FormulaAmountReceivablePeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FerroatlanticasMember" name="FerroatlanticasMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FerroatlanticaDelCincaS.l.Member" name="FerroatlanticaDelCincaS.l.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FerroatlanticaParticipacionesS.l.u.Member" name="FerroatlanticaParticipacionesS.l.u.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_LeaseLiabilitiesIas17" name="LeaseLiabilitiesIas17" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_RecognisedFinanceLeaseAsAssetsIas17" name="RecognisedFinanceLeaseAsAssetsIas17" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeIas17TextBlock" name="DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeIas17TextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IngSeniorLoanMember" name="IngSeniorLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MaximumUndrawnAvailabilityOutstandingLetterOfCredit" name="MaximumUndrawnAvailabilityOutstandingLetterOfCredit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MaximumOutstandingAmountOfRevolvingAdvancesAndSwingLoans" name="MaximumOutstandingAmountOfRevolvingAdvancesAndSwingLoans" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_SoundPointCapitalManagementLpSeniorLoanMember" name="SoundPointCapitalManagementLpSeniorLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_Ifrs16Member" name="Ifrs16Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_LeasePayableDiscountedUsingIncrementalBorrowingRate" name="LeasePayableDiscountedUsingIncrementalBorrowingRate" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AdditionalLeaseLiabilitiesRecognized" name="AdditionalLeaseLiabilitiesRecognized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MinimumFinanceLeasePaymentsPayableIas17" name="MinimumFinanceLeasePaymentsPayableIas17" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_MinimumFinanceLeasePaymentsPayableAtPresentValueIas17" name="MinimumFinanceLeasePaymentsPayableAtPresentValueIas17" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AdjustmentsForFinanceIncomeExpense" name="AdjustmentsForFinanceIncomeExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NetPaymentsFromChangesInOwnershipInterestsInSubsidiaries" name="NetPaymentsFromChangesInOwnershipInterestsInSubsidiaries" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IncreaseDecreaseThroughClassifiedAsDiscontinuedOperationsPropertyPlantAndEquipment" name="IncreaseDecreaseThroughClassifiedAsDiscontinuedOperationsPropertyPlantAndEquipment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_TradeAndOtherCurrentReceivablesDueFromRelatedPartiesNet" name="TradeAndOtherCurrentReceivablesDueFromRelatedPartiesNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ImpairmentOfPropertyPlantAndEquipmentNet" name="ImpairmentOfPropertyPlantAndEquipmentNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsTaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxBenefit" name="IfrsTaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxBenefit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsTaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense" name="IfrsTaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IncreaseDecreaseThroughTranslationAndOtherChangesEquity" name="IncreaseDecreaseThroughTranslationAndOtherChangesEquity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_NumberOfCustomersRepresentingTenPercentOfMoreOfSales" name="NumberOfCustomersRepresentingTenPercentOfMoreOfSales" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_FerroatlanticaSauAndUltracorePolskaZooMember" name="FerroatlanticaSauAndUltracorePolskaZooMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AccountingProfitAdjustmentDiscontinuedOperations" name="AccountingProfitAdjustmentDiscontinuedOperations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_AccountingProfitIncludingAdjustmentForDiscontinuedOperations" name="AccountingProfitIncludingAdjustmentForDiscontinuedOperations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_GrantDate7Member" name="GrantDate7Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsEarningsPerShareTableTextBlock" name="ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsEarningsPerShareTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_LossOnDisposalsOfIntangibleAssets" name="LossOnDisposalsOfIntangibleAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_ImpairmentLossNet" name="ImpairmentLossNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gsm_IfrsTaxCutsAndJobsActMeasurementPeriodAdjustmentIncomeTaxExpenseBenefit" name="IfrsTaxCutsAndJobsActMeasurementPeriodAdjustmentIncomeTaxExpenseBenefit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
