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Note 13 - Other Expenses (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Line Items [Line Items] |  |  |  |
COVID-19 Donations expenses | [1] | $ 1,322 |  |
ZIMBABWE |  |  |  |
Statement Line Items [Line Items] |  |  |  |
COVID-19 Donations expenses |  | 840 |  |
Gwanda [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
COVID-19 Donations expenses |  | $ 482 |  |
[1] | Blanket Mine donated $840 towards the Zimbabwean Ministry of Mines and Development and $482 towards a clinic in Gwanda, in helping to curb the spread of COVID-19 and the impacts thereof.

X
- Definition Represents amount of COVID-19 Donations expenses. + References No definition available. + Details
Name: | cmcl_COVID19DonationsExpenses
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- Details
Name: | srt_StatementGeographicalAxis=country_ZW
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=cmcl_GwandaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |