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Note 10 - Other Income (Details Textual) - Blanket Mine [member]	Mar. 06, 2019
Statement Line Items [Line Items]
Gross, gold, price per kilogram	44,000
Gross, gold, price per ounce	1,368.58

X

- Definition

The gross price of gold per kilogram

+ References

No definition available.

+ Details

Name:	cmcl_GrossGoldPricePerKilogram
Namespace Prefix:	cmcl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The gross price of gold per ounce.

+ References

No definition available.

+ Details

Name:	cmcl_GrossGoldPricePerOunce
Namespace Prefix:	cmcl_
Data Type:	xbrli:pureItemType
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

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cmcl_BlanketMineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: