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Note 21 - Prepayments - Prepayments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Statement Line Items [Line Items] |  |
Prepayments of property, plant and equipment | $ 2,951 | $ 0
Other prepayments | 661 | 55
Current prepayments and other current assets | 6,930 | 1,974
South African operations [member] |  |
Statement Line Items [Line Items] |  |
Suppliers | 1,552 | 846
Zimbabwean operations [member] |  |
Statement Line Items [Line Items] |  |
Suppliers | $ 1,766 | $ 1,073

X
- Definition Amount of other prepayments. + References No definition available. + Details
Name: | cmcl_OtherPrepayments
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of prepayments of property, plant and equipment + References No definition available. + Details
Name: | cmcl_PrepaymentsOfPropertyPlantAndEquipment
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

X
- Definition The amount of current advances made to suppliers before goods or services are received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_CurrentAdvancesToSuppliers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of current prepayments and other current assets. [Refer: Other current assets; Current prepayments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=cmcl_SouthAfricanOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=cmcl_ZimbabweanOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |