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Note 6 - Blanket Zimbabwe Indigenisation Transaction (Tables) | 12 Months Ended
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Dec. 31, 2020
Statement Line Items [Line Items] |
Disclosure of indigenisation shareholder percentages and facilitation loan balances [text block] |
|  |  |  |  |  |  |  |  |  |  | Balance of facilitation loan # |
USD |  | Shareholding |  |  | Effective interest & NCI recognised |  |  | NCI subject to facilitation loan |  |  | December 31, 2020 |  |  | December 31, 2019 |
NIEEF |  |  | 16 | % |  |  | 3.20 | % |  |  | 12.80 | % |  |  | 11,728 |  |  |  | 11,877 |
Fremiro |  |  | - & |  |  |  | - & |  |  |  | - & |  |  |  | - & |  |  |  | 11,458 |
Community Trust |  |  | 10 | % |  |  | 10.00 | % |  |  | – |  |  |  | – |  |  |  | – |
BETS ~ |  |  | 10 | % |  |  | – |  |  |  | – |  |  |  | 7,447 |  |  |  | 7,639 |
|  |  | 36 | % |  |  | 13.20 | % |  |  | 12.80 | % |  |  | 19,175 |  |  |  | 30,974 |
Disclosure of movement in dividend loan [text block] |
Balance at January 1, 2019 |  |  | 30,986 |
Finance cost accrued |  |  | 1,609 |
Dividends used to repay loans |  |  | (1,621 | )
Balance at December 31, 2019 |  |  | 30,974 |
Cancellation of Fremiro loan |  |  | (11,458 | )
Finance cost accrued |  |  | 1,396 |
Dividends used to repay loan |  |  | (1,737 | )
Balance at December 31, 2020 |  |  | 19,175 |
Disclosure of facilitation loans [text block] |
|  |  | Total
Balance at January 1, 2019 |  |  | 2,053
Finance cost accrued |  |  | 104
Dividends used to repay advance dividend loan |  |  | (525)
Balance at December 31, 2019 |  |  | 1,632
Finance cost accrued |  |  | 98
Dividends used to repay advance dividend loan |  |  | (736)
Balance at December 31, 2020 |  |  | 994

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- Definition Tabular disclosure of the reconciliation of facilitation loans. + References No definition available. + Details
Name: | cmcl_DisclosureOfFacilitationLoansTextBlock
Namespace Prefix: | cmcl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the indigenisation shareholder percentages and their respective facilitation loan balances. + References No definition available. + Details
Name: | cmcl_DisclosureOfIndigenisationShareholderPercentagesAndFacilitationLoanBalancesTextBlock
Namespace Prefix: | cmcl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure for the movement in advanced dividend loans. + References No definition available. + Details
Name: | cmcl_DisclosureOfMovementInDividendLoanTextBlock
Namespace Prefix: | cmcl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cmcl_StatementLineItems
Namespace Prefix: | cmcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration