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Note 12 - Leases - Minimum Lease Payments (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Statement Line Items [Line Items] |
Minimum lease payments | $ 239
Not later than one year [member] |
Statement Line Items [Line Items] |
Minimum lease payments | 61
Later than one year and not later than two years [member] |
Statement Line Items [Line Items] |
Minimum lease payments | 46
Later than two years and not later than three years [member] |
Statement Line Items [Line Items] |
Minimum lease payments | 46
Later than three years and not later than four years [member] |
Statement Line Items [Line Items] |
Minimum lease payments | 46
Later than four years and not later than five years [member] |
Statement Line Items [Line Items] |
Minimum lease payments | 40
Later than five years [member] |
Statement Line Items [Line Items] |
Minimum lease payments |

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 amount of undiscounted operating lease payments to be paid. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References No definition available. + Details
Name: | cmcl_UndiscountedOperatingLeasePaymentsToBePaid
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |