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Note 14 - Derivative Financial Instruments - Fair Value Losses on Derivative assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Gold hedge [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | $ 0 | $ 0 | $ 102
Derivative assets [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | 1,198 | 240 | 266
Put option [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | 38 | 0 | 0
Gold loan agreement [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | (228) | 21 | 0
Call option [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | (240) | 0 | 0
Cap and collar options and call options [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | 832 | 114 | 0
Call options transaction costs [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | 796 | 0 | 0
Gold ETF [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value losses on derivative financial instruments | $ 0 | $ 105 | $ 164

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- Definition The amount of losses (gains) on change in fair value of derivatives. + References No definition available. + Details
Name: | cmcl_LossesGainsOnChangeInFairValueOfDerivatives
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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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- Definition The losses resulting from changes in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_LossesOnChangeInFairValueOfDerivatives
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfFinancialAssetsAxis=cmcl_DerivativeAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cmcl_PutOptionMember
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: |

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

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

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

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