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Note 39 - Subsequent events (Details Textual) $ in Thousands | Feb. 27, 2020 | Jan. 21, 2020 USD ($)
--- | --- | ---
Advancement of dividend loan [member] |  |
Statement Line Items [Line Items] |  |
Dividend loan, percent accrual | 20.00% |
Dividend loan, percent repaid | 80.00% |
Femiro [Member] | Major business combination [member] |  |
Statement Line Items [Line Items] |  |
Percentage of voting equity interests acquired |  | 15.00%
Total consideration transferred, acquisition-date fair value |  | $ 16,667
Number of instruments or interests issued or issuable |  | 727,266

X
- Definition The percent of dividend loan that will continue to accrue. + References No definition available. + Details
Name: | cmcl_DividendLoanPercentAccrual
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percent of a dividend loan that will be repaid. + References No definition available. + Details
Name: | cmcl_DividendLoanPercentRepaid
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | cmcl_StatementLineItems
Namespace Prefix: | cmcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
Name: | ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_f_iv&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
Name: | ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
Name: | ifrs-full_PercentageOfVotingEquityInterestsAcquired
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cmcl_AdvancementOfDividendLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cmcl_FemiroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_MajorBusinessCombinationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |