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Note 9 - Other Income - Government Grant (Details)	1 Months Ended	4 Months Ended	13 Months Ended		20 Months Ended
	Jan. 31, 2018	Jun. 26, 2020	Mar. 09, 2020	Feb. 20, 2019	Dec. 31, 2017
Statement Line Items [Line Items]
Percentage	2.50%	25.00%	0.00%	10.00%	3.50%

X

- Definition

The percentage applied for export credit incentive (“ECI”) on applicable periods.

+ References

No definition available.

+ Details

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