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Note 6 - Blanket Mine Indigenization Transaction (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of indigenisation shareholder percentages and facilitation loan balances [text block] |
Blanket Mine’s indigenisation shareholding percentages and facilitation loan balances
|  |  |  |  |  |  |  | Balance of facilitation loan #
$ 000's |  |  | Shareholding |  |  |  | NCI Recognised |  |  |  | NCI subject to facilitation loan |  |  |  | Dec, 31, 2019 |  |  |  | Dec, 31 2018 |
NIEEF |  |  | 16 | % |  |  | 3.2 | % |  |  | 12.8 | % |  |  | 11,877 |  |  |  | 11,876 |
Fremiro (refer note 38(b)) |  |  | 15 | % |  |  | 3.0 | % |  |  | 12.0 | % |  |  | 11,458 |  |  |  | 11,466 |
Community Trust |  |  | 10 | % |  |  | 10.0 | % |  |  | - |  |  |  | - |  |  |  | - |
BETS |  |  | 10 | % |  |  | - | * |  |  | - | * |  |  | 7,639 |  |  |  | 7,644 |
|  |  | 51 | % |  |  | 16.2 | % |  |  | 24.8 | % |  |  | 30,974 |  |  |  | 30,986 |
Disclosure of facilitation loans [text block] |
Balance at January 1, 2018 |  |  | 31,052 |
Interest accrued |  |  | 2,173 |
Dividends used to repay loans |  |  | (2,239 | )
Balance at December 31, 2018 |  |  | 30,986 |
Interest accrued |  |  | 1,609 |
Dividends used to repay loans |  |  | (1,621 | )
Balance at December 31, 2019 |  |  | 30,974 |
Disclosure of movement in dividend loan [text block] |
|  | Total
Balance at January 1, 2018 |  |  | 2,604 |
Interest accrued |  |  | 174 |
Dividends used to repay advance dividends |  |  | (725 | )
Balance at December 31, 2018 |  |  | 2,053 |
Interest accrued |  |  | 104 |
Dividends used to repay advance dividends |  |  | (525 | )
Balance at December 31, 2019 |  |  | 1,632 |

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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