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Note 28 - Provisions (Details Textual) - Provision for decommissioning, restoration and rehabilitation costs for Blanket mine [member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |
Major assumptions made concerning future events, other provisions, discount rate | 1.45% | 2.31% | 2.95%
Major assumptions made concerning future events, other Provisions, inflation rate | 2.05% | 2.27% | 2.13%
Other provisions, undiscounted cash flows | $ 3,389 | $ 3,364 | $ 3,604

X
- Definition The assumed discount rate for the uncertainties relating to the amount or timing of outflows of economic benefits for other provisions. + References No definition available. + Details
Name: | cmcl_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsDiscountRate
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The assumed inflation rate for the uncertainties relating to the amount or timing of outflows of economic benefits for other provisions. + References No definition available. + Details
Name: | cmcl_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsInflationRate
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The undiscounted amount of provisions other than provisions for employee benefits. + References No definition available. + Details
Name: | cmcl_OtherProvisionsUndiscountedCashFlows
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cmcl_ProvisionForDecommissioningRestorationAndRehabilitationCostsForBlanketMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |