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Note 14 - Derivative Financial Instruments - Allocation of Proceeds Received (Details) - Auramet International LLC [Member] - USD ($) $ in Thousands | Dec. 13, 2021 | Dec. 31, 2021
--- | --- | ---
Statement Line Items [Line Items] |  |
Gross proceeds | $ 3,000 |
Transaction cost | (40) |
Net proceeds received | 2,960 |
Gold loan agreement [member] |  |
Statement Line Items [Line Items] |  |
Financial liabilities, at fair value | 208 | $ 2,866
Call option [member] |  |
Statement Line Items [Line Items] |  |
Financial liabilities, at fair value | $ 2,752 | $ 229

X
- Definition The amount of cash outflow for transaction cost. + References No definition available. + Details
Name: | cmcl_PaymentsForTransactionCost
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash inflow from derivative financial liabilities. + References No definition available. + Details
Name: | cmcl_ProceedsFromDerivativeFinancialLiabilities
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from derivative financial liabilities, net of transaction costs. + References No definition available. + Details
Name: | cmcl_ProceedsFromDerivativeFinancialLiabilitiesNet
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
- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_FinancialLiabilitiesAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_CounterpartiesAxis=cmcl_AurametInternationalLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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