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Note 8 - Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Line Items [Line Items]
Intermediated Money Transaction Tax			$ 213	$ 165
Solar expenses			202
COVID-19 Donations			1,048
Impairment of property, plant and equipment			59	144
Other expenses	$ 1,314	$ 220	$ 1,522	$ 309

X

- Definition

Represents amount of COVID-19 Donations expenses.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount of transaction tax expense for intermediated money transaction.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount of solar expenses.

+ References

No definition available.

+ Details

Name:	cmcl_SolarExpenses
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	cmcl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2019-01-01
-Paragraph 73
-Subparagraph e
-Clause v
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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Balance Type:	debit
Period Type:	duration