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Note 17 - Cash and Cash Equivalents - Overdrafts and Short Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2022
--- | --- | ---
Statement Line Items [Line Items] |  |
Principal value | $ 18.0 | $ 12.0
Balance drawn | 14.8 |
Overdraft facility of Stanbic Bank, ZiG [member] |  |
Statement Line Items [Line Items] |  |
Principal value | 6.5 |
Overdraft facility of Stanbic Bank, USD [member] |  |
Statement Line Items [Line Items] |  |
Principal value | 4.0 |
Balance drawn | 3.9 |
Term loans, CABS Bank, one [member] |  |
Statement Line Items [Line Items] |  |
Principal value | 3.0 |
Balance drawn | 1.2 |
Overdraft facility of Ecobank [member] |  |
Statement Line Items [Line Items] |  |
Principal value | 4.0 |
Balance drawn | 3.8 |
Nedbank Zimbabwe [member] |  |
Statement Line Items [Line Items] |  |
Principal value | 7.0 |
Balance drawn | $ 5.9 |

X
- Definition Represents the bank balance drawn at a specified date. + References No definition available. + Details
Name: | cmcl_BankBalanceDrawn
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | cmcl_Statement1LineItems
Namespace Prefix: | cmcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_OverdraftFacilityOfStanbicBankZigMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_OverdraftFacilityOfStanbicBankUsdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_TermLoansCABSBankUSDOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_OverdraftFacilityOfEcobankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_NedbankZimbabweMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |