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        <link:definition>090800 - Disclosure - Cash and cash equivalents (Details)</link:definition>
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        <link:definition>090900 - Disclosure - Other current assets (Details)</link:definition>
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        <link:definition>091000 - Disclosure - Marketable securities, Measured at FVOCI (Details)</link:definition>
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        <link:definition>091002 - Disclosure - Marketable securities, Overall Movement through OCI (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <!--Parent Role: Property, plant and equipment-->
        <link:definition>091100 - Disclosure - Property, plant and equipment (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://ghres.com/role/TradePayablesDetails" id="TradePayablesDetails">
        <!--Parent Role: Trade payables-->
        <link:definition>091200 - Disclosure - Trade payables (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>091300 - Disclosure - Other current liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>091400 - Disclosure - Leases, Right-of-Use Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://ghres.com/role/LeasesLeaseLiabilitiesDetails" id="LeasesLeaseLiabilitiesDetails">
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        <link:definition>091402 - Disclosure - Leases, Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>091502 - Disclosure - Share capital and reserves, Summary (Details)</link:definition>
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        <link:definition>091504 - Disclosure - Share capital and reserves, Reserves (Details)</link:definition>
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        <link:definition>091700 - Disclosure - Share-based compensation, Share Options (Details)</link:definition>
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        <link:definition>091702 - Disclosure - Share-based compensation, Share Option Awards Outstanding (Details)</link:definition>
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        <link:definition>091704 - Disclosure - Share-based compensation, Fair Values of the Options Granted (Details)</link:definition>
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        <link:definition>091800 - Disclosure - Financial risk management, Foreign Exchange Risk (Details)</link:definition>
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        <link:definition>091804 - Disclosure - Financial risk management, Interest Rate Risk (Details)</link:definition>
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        <link:definition>091900 - Disclosure - Related party disclosures (Details)</link:definition>
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        <link:definition>092000 - Disclosure - Loss per share (Details)</link:definition>
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        <link:definition>092100 - Disclosure - Events after the reporting date (Details)</link:definition>
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