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Note 10 - Other Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Statement Line Items [Line Items] |
Disclosure of other operating income components [text block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Government grant – Gold sale export credit incentive |  |  | 4,695 |  |  |  | 866 |  |  |  | 6,482 |
Government grant – Gold support price |  |  | - |  |  |  | 1,064 |  |  |  | - |
Other |  |  | 70 |  |  |  | 94 |  |  |  | 39 |
Greenstone Retirement Fund pay-out |  |  | - |  |  |  | 250 |  |  |  | - |
Greenstone Provident Fund pay-out |  |  | - |  |  |  | - |  |  |  | 363 |
Eersteling rock dump sale |  |  | - |  |  |  | - |  |  |  | 217 |
|  |  | 4,765 |  |  |  | 2,274 |  |  |  | 7,101 |
Disclosure of ECI applicable and percentages applied [text block] |
ECI applicable periods | Percentage
May 1, 2016 – December 31, 2017 | 3.5%
January 1, 2018 – January 31, 2018 | 2.5%
February 1, 2018 – February 20, 2019 | 10%
February 21, 2019 – March 9, 2020 | 0%
March 10, 2020 – June 26, 2020 | 25%

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- Definition Tabular disclosure of export credit incentive (“ECI”) applicable and percentage applied. + References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the components in other operating income. + References No definition available. + Details
Name: | cmcl_DisclosureOfOtherOperatingIncomeComponentsTextBlock
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