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Note 12 - Net Foreign Exchange Gain (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of foreign currency gains (losses) [text block] |
|  | 2019 |  | 2018 |  | 2017
Unrealised Foreign exchange gain(loss) |  |  | 31,411 |  |  |  | 230 |  |  |  | (379 | )
Realised foreign exchange loss |  |  | (1,750 | ) |  |  | (7 | ) |  |  | (1 | )
Net foreign exchange gain/(loss) |  |  | 29,661 |  |  |  | 223 |  |  |  | (380 | )

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- Definition Disclosure of foreign currency gains (losses) reported. + References No definition available. + Details
Name: | cmcl_DisclosureOfForeignCurrencyGainsLossesTextBlock
Namespace Prefix: | cmcl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cmcl_StatementLineItems
Namespace Prefix: | cmcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration