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Note 7 - Capital Management (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of capital components [text block] |
|  | 2017 |  |  | 2016 |
Total equity |  |  | 69,211 |  |  |  | 59,317 |

X
- Definition Tabular disclosure of the components in capital. + References No definition available. + Details
Name: | cmcl_DisclosureOfCapitalComponentsTextBlock
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