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Note 10 - Other Income (Details Textual) - Blanket Mine [member] | Mar. 06, 2019
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Statement Line Items [Line Items] |
Gross, gold, price per kilogram | 44,000
Gross, gold, price per ounce | 1,368.58

X
- Definition The gross price of gold per kilogram + References No definition available. + Details
Name: | cmcl_GrossGoldPricePerKilogram
Namespace Prefix: | cmcl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gross price of gold per ounce. + References No definition available. + Details
Name: | cmcl_GrossGoldPricePerOunce
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
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cmcl_BlanketMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |