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    "ifrs-full_NoncurrentWarrantLiability": {
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     "localname": "NoncurrentWarrantLiability",
     "crdr": "credit",
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     "lang": {
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     "lang": {
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     "lang": {
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     },
     "auth_ref": []
    },
    "crml_NorthGreenlandApSAcquisitionMember": {
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     "localname": "NorthGreenlandApSAcquisitionMember",
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     "lang": {
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        "label": "North Greenland Ap SAcquisition Member"
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     },
     "auth_ref": []
    },
    "crml_NorthGreenlandApSMember": {
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     "localname": "NorthGreenlandApSMember",
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     "lang": {
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    "crml_NotLaterThanSixMonthsMember": {
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     "nsuri": "http://example.com/20260630",
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     "presentation": [
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     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Less than 6 months [Member]",
        "label": "Not Later Than Six Months Member"
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     },
     "auth_ref": []
    },
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        "label": "Inventory, Net [Abstract]"
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     "auth_ref": []
    },
    "ifrs-full_NotionalAmount": {
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     "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full",
     "localname": "NotionalAmount",
     "presentation": [
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     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Interest value",
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      },
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    "ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted": {
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     "localname": "NumberOfInstrumentsOtherEquityInstrumentsGranted",
     "presentation": [
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     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Number of PVOs, Granted during the year",
        "label": "Number of other equity instruments granted in share-based payment arrangement"
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      },
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     "auth_ref": [
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    "crml_NumberOfLicenses": {
     "xbrltype": "integerItemType",
     "nsuri": "http://example.com/20260630",
     "localname": "NumberOfLicenses",
     "presentation": [
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     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Number of licenses",
        "label": "Number Of Licenses",
        "documentation": "Number of licenses."
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      }
     },
     "auth_ref": []
    },
    "ifrs-full_NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement": {
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     "localname": "NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement",
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     "lang": {
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       "role": {
        "terseLabel": "Number of PVOs, Exercisable",
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      "en": {
       "role": {
        "documentation": "The number of other equity instruments (ie other than share options) exercisable in a share-based payment arrangement."
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    "ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement": {
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     "lang": {
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       "role": {
        "periodEndLabel": "Number of PVOs, Outstanding Ending",
        "terseLabel": "Number of RSU\u2019s",
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     "lang": {
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     "lang": {
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    "ifrs-full_NumberOfSharesAuthorised": {
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     "lang": {
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       "role": {
        "terseLabel": "Authorised share capital",
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      },
      "en": {
       "role": {
        "documentation": "The number of shares authorised."
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     "auth_ref": [
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    "ifrs-full_NumberOfSharesIssued": {
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     "presentation": [
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     "lang": {
      "en-us": {
       "role": {
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    "ifrs-full_NumberOfSharesIssuedAndFullyPaid": {
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    "ifrs-full_NumberOfSharesOutstanding": {
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     "lang": {
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       "role": {
        "documentation": "The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]"
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     "auth_ref": [
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    "crml_NumberOfSizzlePublicSharesAtClosing": {
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