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Note 32 - Financial Instruments and Risk Management - Effect of Gold Prices on Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Put option derivative [member] |  |
Statement Line Items [Line Items] |  |
Increase by 5% of the gold price | $ 0 | $ 0
Decrease by 5% of the gold price | 22 | 0
Increase by 5% of the gold price | 0 | 0
Decrease by 5% of the gold price | 22 | 0
Gold loan derivative [member] |  |
Statement Line Items [Line Items] |  |
Increase by 5% of the gold price | 0 | 143
Decrease by 5% of the gold price | 0 | (143)
Increase by 5% of the gold price | 0 | 143
Decrease by 5% of the gold price | 0 | (143)
Call option derivative [member] |  |
Statement Line Items [Line Items] |  |
Increase by 5% of the gold price | 0 | 11
Decrease by 5% of the gold price | 0 | (11)
Increase by 5% of the gold price | 0 | 11
Decrease by 5% of the gold price | $ 0 | $ (11)

X
- Definition The effect of 5% increase in gold price on derivative instrument. + References No definition available. + Details
Name: | cmcl_EffectOf5DecreaseInGoldPriceOnDerivativeInstrument
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The effect of 5% decrease in gold price on derivative instrument fair value loss. + References No definition available. + Details
Name: | cmcl_EffectOf5DecreaseInGoldPriceOnDerivativeInstrumentFairValueLoss
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of effect of 5% increase in gold price on derivative instrument. + References No definition available. + Details
Name: | cmcl_EffectOf5IncreaseInGoldPriceOnDerivativeInstrument
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The effect of 5% increase in gold price on derivative instrument fair value loss. + References No definition available. + Details
Name: | cmcl_EffectOf5IncreaseInGoldPriceOnDerivativeInstrumentFairValueLoss
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_TypesOfFinancialAssetsAxis=cmcl_PutOptionDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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