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  <xs:element id="snd_NoncashOrPartNoncashFixedAssetsPurchasedWithDebt" abstract="false" name="NoncashOrPartNoncashFixedAssetsPurchasedWithDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="snd_NumberOfMinesAndRelatedFacilitiesAcquired" abstract="false" name="NumberOfMinesAndRelatedFacilitiesAcquired" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="snd_InventoryWorkInProcessNet" abstract="false" name="InventoryWorkInProcessNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="snd_AccruedEquipmentExpense" abstract="false" name="AccruedEquipmentExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snd_AccruedFreightAndDeliveryChargesCurrent" abstract="false" name="AccruedFreightAndDeliveryChargesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snd_UsGaap_OakdaleEquipmentFinancingMemberMember" abstract="true" name="UsGaap_OakdaleEquipmentFinancingMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
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  <xs:element id="snd_PermitBondMember" abstract="true" name="PermitBondMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
</xs:schema>
