XML 40 R78.htm IDEA: XBRL DOCUMENT
v3.20.1

Note 5 - Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Bottom of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Right of use assets, useful life | 3 years |  |
Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Right of use assets, useful life | 6 years |  |
Buildings [member] | Bottom of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years | 10 years | 10 years
Buildings [member] | Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Property, plant, and equipment, useful life | 15 years | 15 years | 15 years
Machinery [member] |  |  |
Statement Line Items [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years | 10 years | 10 years
Fixtures and fittings [member] | Bottom of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Property, plant, and equipment, useful life | 4 years | 4 years | 4 years
Fixtures and fittings [member] | Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years | 10 years | 10 years
Motor vehicles [member] |  |  |
Statement Line Items [Line Items] |  |  |
Property, plant, and equipment, useful life | 4 years | 4 years | 4 years

X
- Definition The useful lives used for property, plant and equipment. + References No definition available. + Details
Name: | cmcl_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | cmcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The duration term for the useful life of right of use assets. + References No definition available. + Details
Name: | cmcl_RightOfUseAssetsUsefulLife
Namespace Prefix: | cmcl_
Data Type: | xbrli:durationItemType
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

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MotorVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |