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Note 10 - Other Income (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of other operating income components [text block] |
|  | 2019 |  | 2018 |  | 2017
Government grant – Gold sale export incentive |  |  | 866 |  |  |  | 6,482 |  |  |  | 2,446 |
Government grant – Gold support price |  |  | 1,064 |  |  |  | - |  |  |  | - |
Other |  |  | 94 |  |  |  | 39 |  |  |  | 148 |
Greenstone Retirement Fund pay-out |  |  | 250 |  |  |  | - |  |  |  | - |
Greenstone Provident Fund pay-out |  |  | - |  |  |  | 363 |  |  |  | - |
Eersteling rock dump sale |  |  | - |  |  |  | 217 |  |  |  | - |
|  |  | 2,274 |  |  |  | 7,101 |  |  |  | 2,594 |

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- Definition Tabular disclosure of the components in other operating income. + References No definition available. + Details
Name: | cmcl_DisclosureOfOtherOperatingIncomeComponentsTextBlock
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