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Note 21 - Cash and Cash Equivalents - Exposure to Risk (Details) | Dec. 31, 2019 USD ($)
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Overdraft facility, Stanbic Bank [Member] |
Statement Line Items [Line Items] |
Denomination | $ 15,000,000
Interest rate | 25.00%
Overdraft facility, First Capital Bank [member] |
Statement Line Items [Line Items] |
Denomination | $ 10,000,000
Interest rate | 26.00%

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- Definition The interest rate of exposure risk. + References No definition available. + Details
Name: | cmcl_ExposureRiskInterestRate
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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

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- Definition The amount of exposure to loss resulting from credit risk. [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph IG24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG24_a&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph IG25 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG25_b&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 36 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_c&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_CreditExposure
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_OverdraftFacilityStanbicBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=cmcl_OverdraftFacilityFirstCapitalBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |