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  <element id="vgz_NumberOfExecutivesAndDirectorsAffectedByOptionAmendment" name="NumberOfExecutivesAndDirectorsAffectedByOptionAmendment" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="vgz_PaymentsOfCashBuyoutUponOptionAmendment" name="PaymentsOfCashBuyoutUponOptionAmendment" 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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</xs:schema>
