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Note 27 - Non-controlling Interests (Details Textual)	Dec. 31, 2020	Jan. 20, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 20, 2012
Statement Line Items [Line Items]
Percentage of net assets recognised as NCI	13.20%	13.20%	16.20%	16.20%	16.20%

X

- Definition

The percentage of net assets recognised as non-controlling interest.

+ References

No definition available.

+ Details

Name:	cmcl_PercentageOfNetAssetsRecognisedAsNCI
Namespace Prefix:	cmcl_
Data Type:	num:percentItemType
Balance Type:	na
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