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Note 6 - Blanket Zimbabwe Indigenisation Transaction - Movement in Advance Dividend Loan (Details) - Reserve of share-based payments [member] - Faciliation Loans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement Line Items [Line Items]
Balance	$ 30,974	$ 30,986
Finance cost accrued	1,396	1,609
Dividends used to repay loans	(1,737)	(1,621)
Cancellation of Fremiro loan	(11,458)
Balance	$ 19,175	$ 30,974

X

- Definition

Amount of advanced dividend loans classified as equity. The loans arising are not recognized as loans receivable due to the uncertain future of dividends.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmcl_
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Period Type:	instant

X

- Definition

Represents cancellation of dividend loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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- References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The amount of dividends received.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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X

- Definition

The amount of income arising from interest.

+ References

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Namespace Prefix:
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