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Note 22 - Provisions (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Provision for decommissioning, restoration and rehabilitation costs for Blanket mine [member] |  |  |
Statement Line Items [Line Items] |  |  |
Major assumptions made concerning future events, other provisions, discount rate | 0.64% | 0.86% |
Major assumptions made concerning future events, other Provisions, inflation rate | 0.00% | 0.00% |
Other provisions, undiscounted cash flows | $ 3,354 | $ 3,159 | $ 3,006
Provision for decommissioning, restoration and rehabilitation costs for Eersteling mine [member] |  |  |
Statement Line Items [Line Items] |  |  |
Other provisions, undiscounted cash flows | $ 669 | $ 571 |

X
- Definition The assumed discount rate for the uncertainties relating to the amount or timing of outflows of economic benefits for other provisions. + References No definition available. + Details
Name: | cmcl_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsDiscountRate
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The assumed inflation rate for the uncertainties relating to the amount or timing of outflows of economic benefits for other provisions. + References No definition available. + Details
Name: | cmcl_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsInflationRate
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The undiscounted amount of provisions other than provisions for employee benefits. + References No definition available. + Details
Name: | cmcl_OtherProvisionsUndiscountedCashFlows
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cmcl_ProvisionForDecommissioningRestorationAndRehabilitationCostsForBlanketMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cmcl_ProvisionForDecommissioningRestorationAndRehabilitationCostsForEerstelingMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |