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Note 8 - Capital Management (Tables) | 12 Months Ended
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Dec. 31, 2020
Statement Line Items [Line Items] |
Disclosure of capital components [text block] |
|  | 2020 |  |  | 2019 |  |  | January 1, 2019 |
Total equity |  |  | 158,043 |  |  |  | 124,717 |  |  |  | 78,808 |

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- Definition Tabular disclosure of the components in capital. + References No definition available. + Details
Name: | cmcl_DisclosureOfCapitalComponentsTextBlock
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