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Note 33 - Financial Instruments and Risk Management - Sensitivity Analysis on Derivative Financial Liabilities Market Risk (Details) - Market risk [member] $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($)
Statement Line Items [Line Items] |
Derivative financial liabilities -increase | $ 154
Derivative financial liabilities - decrease | (154)
Fair value loss on derivative financial instruments - increase | 154
Fair value loss on derivative financial instruments - decrease | (154)
Gold loan agreement [member] |
Statement Line Items [Line Items] |
Derivative financial liabilities -increase | 143
Derivative financial liabilities - decrease | (143)
Fair value loss on derivative financial instruments - increase | 143
Fair value loss on derivative financial instruments - decrease | (143)
Call option [member] |
Statement Line Items [Line Items] |
Derivative financial liabilities -increase | 11
Derivative financial liabilities - decrease | (11)
Fair value loss on derivative financial instruments - increase | 11
Fair value loss on derivative financial instruments - decrease | $ (11)

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- Definition The effect of five percent decrease in gold price in derivative financial liabilities. + References No definition available. + Details
Name: | cmcl_EffectOfFivePercentDecreaseInGoldPriceOnDerivativeFinancialLiabilties
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The effect of five percent decrease in gold price on fair value loss of derivative financial instruments. + References No definition available. + Details
Name: | cmcl_EffectOfFivePercentDecreaseInGoldPriceOnFairValueLossOfDerivativeFinancialInstruments
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The effect of a five percent increase in gold price on derivative financial liability. + References No definition available. + Details
Name: | cmcl_EffectOfFivePercentIncreaseInGoldPriceOnDerivativeFinancialLiability
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The effect of five percent increase in gold price on fair value loss of derivative financial instruments. + References No definition available. + Details
Name: | cmcl_EffectOfFivePercentIncreaseInGoldPriceOnFairValueLossOfDerivativeFinancialInstruments
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cmcl_GoldLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cmcl_CallOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |