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Note 32 - Dividends (Details Textual) - $ / shares |  | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Dec. 31, 2019
Statement Line Items [Line Items] |  |
Dividends recognised as distributions to owners per share |  | $ 6.875
Dividend increase [member] |  |
Statement Line Items [Line Items] |  |
Dividends recognised as distributions to owners per share | $ 7.50 |

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

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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_107&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |