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Note 29 - Provisions (Details Textual) - Provision for decommissioning, restoration and rehabilitation costs for Blanket mine [member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement Line Items [Line Items]
Major assumptions made concerning future events, other provisions, discount rate	1.94%	1.45%
Major assumptions made concerning future events, other Provisions, inflation rate	2.26%	2.05%
Other provisions, undiscounted cash flows	$ 3,087	$ 3,389

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: