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Note 33 - Financial Instruments - Exposure to Risk (Details) R in Thousands, $ in Thousands | Dec. 31, 2020 ZAR (R) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 ZAR (R) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 ZAR (R) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | --- | ---
Currency risk [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed | R 59 | $ 2,442 | R 57 | $ 2,771 | R 57 | $ 1,968
Effect of possible strengthening or weakening | 3 | 126 | 3 | 150 | 3 | 95
Currency risk [member] | Cash and cash equivalents [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed | 59 | 1,959 | 57 | 4,176 | 57 | 8,147
Effect of possible strengthening or weakening | 3 | 103 | 3 | 199 | 3 | 388
Currency risk [member] | Trade and other receivables [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  | 249 |  | 1,735 |  | 126
Effect of possible strengthening or weakening |  | 12 |  | 82 |  | 6
Currency risk [member] | Trade and other payables [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  | (174) |  | (179) |  | (345)
Effect of possible strengthening or weakening |  | (8) |  | 9 |  | (16)
Currency risk [member] | Overdrafts [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  |  |  | (23) |  |
Currency risk [member] | Term loan [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  | 408 |  | (2,471) |  | (5,960)
Effect of possible strengthening or weakening |  | 19 |  | (117) |  | (283)
Currency risk [member] | Overdraft [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  |  |  | (490) |  |
Interest rate risk [member] | Cash and cash equivalents [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  | 19,092 |  | 9,383 |  | 11,187
Interest rate risk [member] | Term loan facility [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  | (408) |  | (2,471) |  | (5,960)
Interest rate risk [member] | Overdrafts [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net monetary assets/(liabilities) exposed |  |  |  | (490) |  |
Interest rate risk , increase by 100 basis points [member] | Cash and cash equivalents [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  | 191 |  | 94 |  | 111
Interest rate risk , increase by 100 basis points [member] | Term loan [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  | 4 |  | (25) |  | (60)
Interest rate risk , increase by 100 basis points [member] | Overdraft [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  |  |  | (5) |  |
Interest rate risk, decrease by 100 basis points [member] | Cash and cash equivalents [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  | (191) |  | (94) |  | (111)
Interest rate risk, decrease by 100 basis points [member] | Term loan [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  | (4) |  | 25 |  | 60
Interest rate risk, decrease by 100 basis points [member] | Overdraft [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Effect of possible strengthening or weakening |  |  |  | $ 5 |  |

X
- Definition The effect on profit or loss and equity due to the various functional currencies against the foreign currencies. + References No definition available. + Details
Name: | cmcl_FunctionalCurrenciesAgainstTheForeignCurrenciesEffectOnProfitOrLossAndEquity
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The monetary assets and liabilities denominated in foreign currencies which is different to the functional currency of the underlying entities, the profit or loss and equity in the underlying entities could be affected by movements between the functional currency and the foreign currency. + References No definition available. + Details
Name: | cmcl_NetMonetaryAssetsliabilitiesExposed
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TradeAndOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TradeAndOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_OverdraftsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_OverdraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfRisksAxis=cmcl_InterestRateRiskIncreaseBy100BasisPointsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
Period Type: |