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Note 10 - Other Income (Details Textual) $ in Thousands, R in Millions |  | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 06, 2019 | Jan. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019 ZAR (R) | Dec. 31, 2019 USD ($) | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |  |  |
Government grants, export incentive on gold |  | 2.50% | 10.00% |  |  | 3.50%
Income from pension benefits fund surplus pay-out |  |  |  | R 3.6 | $ 250 |
Blanket Mine [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Gross, gold, price per kilogram | 44,000 |  |  |  |  |
Gross, gold, price per ounce | 1,368.58 |  |  |  |  |

X
- Definition Export incentive on gold proceeds received from government grants. + References No definition available. + Details
Name: | cmcl_GovernmentGrantsExportIncentiveOnGold
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gross price of gold per kilogram + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The gross price of gold per ounce. + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
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X
- Definition The amount of income from a pension benefits fund due to the surplus pay-out. + References No definition available. + Details
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- References No definition available. + Details
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- Details
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