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Note 18 - Exploration and Evaluation Assets - Exploration and Evaluation Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | $ 8,648 | $ 6,768
- Mining claims acquired |  | 7,844 | 4,000
Decommissioning asset acquired |  |  | 135
- Consumables and drilling |  | 1,206 | 1,218
- Contractor |  | 4 | 117
- Labour |  | 308 | 208
- Power |  | 36 | 39
Impairment * | [1] | (467) | (3,837)
Balance |  | 17,579 | 8,648
Motapa [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 0 | 0
- Mining claims acquired |  | 7,844 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 0 | 0
- Contractor |  | 0 | 0
- Labour |  | 0 | 0
- Power |  | 0 | 0
Impairment * | [1] | 0 | 0
Balance |  | 7,844 | 0
Maligreen [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 4,196 | 0
- Mining claims acquired |  | 0 | 4,000
Decommissioning asset acquired |  |  | 135
- Consumables and drilling |  | 1,170 | 14
- Contractor |  | 0 | 0
- Labour |  | 260 | 47
- Power |  | 0 | 0
Impairment * | [1] | 0 | 0
Balance |  | 5,626 | 4,196
Connemara North [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 463 | 300
- Mining claims acquired |  | 0 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 0 | 71
- Contractor |  | 4 | 51
- Labour |  | 0 | 41
- Power |  | 0 | 0
Impairment * | [1] | (467) | 0
Balance |  | 0 | 463
Glen Hume [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 0 | 2,661
- Mining claims acquired |  | 0 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 0 | 1,074
- Contractor |  | 0 | 42
- Labour |  | 0 | 60
- Power |  | 0 | 0
Impairment * | [1] | 0 | (3,837)
Balance |  | 0 | 0
GG [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 3,618 | 3,523
- Mining claims acquired |  | 0 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 36 | 16
- Contractor |  | 0 | 0
- Labour |  | 37 | 46
- Power |  | 32 | 33
Impairment * | [1] | 0 | 0
Balance |  | 3,723 | 3,618
Sabiwa [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 290 | 284
- Mining claims acquired |  | 0 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 0 | 0
- Contractor |  | 0 | 0
- Labour |  | 0 | 0
- Power |  | 4 | 6
Impairment * | [1] | 0 | 0
Balance |  | 294 | 290
Abercorn [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 16 | 0
- Mining claims acquired |  | 0 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 0 | 12
- Contractor |  | 0 | 0
- Labour |  | 11 | 4
- Power |  | 0 | 0
Impairment * | [1] | 0 | 0
Balance |  | 27 | 16
Valentine [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 65 | 0
- Mining claims acquired |  | 0 | 0
Decommissioning asset acquired |  |  | 0
- Consumables and drilling |  | 0 | 31
- Contractor |  | 0 | 24
- Labour |  | 0 | 10
- Power |  | 0 | 0
Impairment * | [1] | 0 | 0
Balance |  | $ 65 | $ 65
[1] | Caledonia has completed sufficient work to establish that the potential orebody at the Glen Hume and Connemara North properties will not meet Caledonia’s requirements in terms of size, grade and width. Accordingly, Caledonia will not exercise the option to acquire these properties.

X
- Definition The amount of impairment loss recognised in profit or loss for exploration and evaluation assets. + References No definition available. + Details
Name: | cmcl_ImpairmentLossRecognisedInProfitOrLossExplorationAndEvaluationAssets
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in exploration and evaluation assets from consumables and drilling. + References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in exploration and evaluation assets from contractor. + References No definition available. + Details
Name: | cmcl_IncreaseDecreaseInExplorationAndEvaluationAssetsFromContractor
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in exploration and evaluation assets from decommissioning asset acquired. + References No definition available. + Details
Name: | cmcl_IncreaseDecreaseInExplorationAndEvaluationAssetsFromDecommissioningAssetAcquired
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in exploration and evaluation assets from labour. + References No definition available. + Details
Name: | cmcl_IncreaseDecreaseInExplorationAndEvaluationAssetsFromLabour
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in exploration nd evaluation assets from mining claims acquired. + References No definition available. + Details
Name: | cmcl_IncreaseDecreaseInExplorationAndEvaluationAssetsFromMiningClaimsAcquired
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in exploration and evaluation assets from power. + References No definition available. + Details
Name: | cmcl_IncreaseDecreaseInExplorationAndEvaluationAssetsFromPower
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- Definition The amount of assets arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

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