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Note 23 - Share Capital (Details Textual) $ / shares in Thousands | Jun. 26, 2017 | Dec. 31, 2019 $ / shares
--- | --- | ---
Statement Line Items [Line Items] |  |
Share consolidation ratio | 5 |
Ordinary shares [member] |  |
Statement Line Items [Line Items] |  |
Par value per share |  | $ 0
Preference shares [member] |  |
Statement Line Items [Line Items] |  |
Par value per share |  | $ 0

X
- Definition Number of shares consolidated per one share during the period. + References No definition available. + Details
Name: | cmcl_ShareConsolidationRatio
Namespace Prefix: | cmcl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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 nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_ParValuePerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |