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Note 27 - Share-based Expenses - Other Equity Share Units Granted (Details) - Cash-settled awards [member] | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Statement Line Items [Line Items] |  |  |
Grants | 52,282 |  |
Settlements |  | (44,985) | (26,864)
Total awards outstanding December 31 |  | 7,297 | 16,384
Estimated awards expected to vest at December 31 |  | 100.00% | 100.00%
July 2017 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants |  | 37,330 | 37,330
August 2018 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants |  | 5,918 | 5,918
August 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants |  | 9,034 |

X
- Definition The estimated percentage of awards that are expected to vest. + References No definition available. + Details
Name: | cmcl_EstimatedAwardsExpectedToVestPercentage
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | na
Period Type: | instant

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

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- Details
Name: | ifrs-full_CreationDateAxis=cmcl_July2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreationDateAxis=cmcl_August2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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