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Note 22 - Eersteling (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of disposal of assets and liabilities classified as held for sale [text block] |
Carrying amounts of net assets over which control was lost: |  | 2019 |
Non-current assets |  |  |  |
Property, plant and equipment |  |  | 227 |
Current assets |  |  |  |
Trade and other receivables |  |  | 84 |
Total assets |  |  | 311 |
Non-current liabilities |  |  |  |
Rehabilitation provision |  |  | 650 |
Current liabilities |  |  |  |
Trade and other payables |  |  | 8 |
Total liabilities |  |  | 658 |
Consideration receivable: |  |  |  |
Cash received |  |  | 1,000 |
Deferred consideration (at January 31, 2019) |  |  | 1,953 |
Total consideration |  |  | 2,953 |
Profit on sale of subsidiary: |  |  |  |
Net liabilities derecognised |  |  | 347 |
Cumulative exchange differences in respect of the net liabilities of the subsidiary reclassified from equity on loss of control of subsidiary |  |  | 2,109 |
Fair value of consideration receivable (at January 31, 2019) |  |  | 2,953 |
Profit on sale of subsidiary |  |  | 5,409 |
Disclosure of assets and liabilities classified as held for sale [text block] |
|  | 2019 |  |  | 2018 |
Non-current assets |  |  |  |  |  |  |  |
Property, plant, and equipment |  |  | - |  |  |  | 214 |
Current assets |  |  |  |  |  |  |  |
Trade and other receivables |  |  | - |  |  |  | 80 |
Cash and cash equivalents |  |  | - |  |  |  | 2 |
Assets held for sale |  |  | - |  |  |  | 296 |
Non-current liabilities |  |  |  |  |  |  |  |
Rehabilitation provision |  |  | - |  |  |  | 602 |
Current liabilities |  |  |  |  |  |  |  |
Trade and other payables |  |  | - |  |  |  | 7 |
Liabilities associated with assets held for sale |  |  | - |  |  |  | 609 |

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- Definition The disclosure of assets and liabilities classified as held for sale. + 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 Disclosure of the disposal of assets and liabilities classified as held for sale. + References No definition available. + Details
Name: | cmcl_DisclosureOfDisposalOfAssetsAndLiabilitiesClassifiedAsHeldForSaleTextBlock
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