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Note 11 - Impairment Loss on Trade Receivables (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement Line Items [Line Items] |
Disclosure of components of other operating expense [text block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Impairment - 2017 royalty rebate |  |  | — |  |  |  | 181 |  |  |  | — |

X
- Definition Tabular disclosure of the components of other operating expenses. + References No definition available. + Details
Name: | cmcl_DisclosureOfComponentsOfOtherOperatingExpenseTextBlock
Namespace Prefix: | cmcl_
Data Type: | nonnum:textBlockItemType
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