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Note 22 - Eersteling (Details Textual) - SH Minerals [member] - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2018 | Mar. 29, 2020 | Dec. 31, 2019 | Jan. 31, 2020 | Jul. 12, 2016
Statement Line Items [Line Items] |  |  |  |  |
Share sale agreement, once off payment |  |  |  |  | $ 3,000
Share sale agreement, amendment, purchase price | $ 3,000 |  |  |  |
Share sale agreement, amendment, amount of each payment | $ 1,000 |  |  |  |
Share sale agreement, amendment, amount of payment, received |  |  | $ 1,000 |  |
Outstanding receivable from sale of subsidiaries |  |  | $ 1,000 |  |
Sales agreement with Eersteling Gold Mining Company Limited [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Share sale agreement, amendment, amount of payment, received |  | $ 901 |  |  |
Outstanding receivable from sale of subsidiaries |  |  |  | $ 99 |

X
- Definition The amount of outstanding receivable from sale of subsidiaries. + References No definition available. + Details
Name: | cmcl_OutstandingReceivableFromSaleOfSubsidiaries
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of each payments pursuant to the amended share sale agreement. + References No definition available. + Details
Name: | cmcl_ShareSaleAgreementAmendmentAmountOfEachPayment
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of payments received during the period. + References No definition available. + Details
Name: | cmcl_ShareSaleAgreementAmendmentAmountOfPaymentReceived
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The purchase price pursuant to the amended share sale agreement. + References No definition available. + Details
Name: | cmcl_ShareSaleAgreementAmendmentPurchasePrice
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of once off payment pursuant to the share sale agreement. + References No definition available. + Details
Name: | cmcl_ShareSaleAgreementOnceOffPayment
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- Details
Name: | ifrs-full_CounterpartiesAxis=cmcl_ShMineralsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cmcl_SalesAgreementWithEerstelingGoldMiningCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |