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Note 19 - Exploration and Evaluation Assets - Exploration and Evaluation Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 6,768 |  | $ 7,139 |
- Option payments |  |  |  | 2,800 |
- Consumables and drilling |  | 1,218 |  | 189 |
- Labour |  | 208 |  | 46 |
- Power |  | 39 |  | 24 |
Reallocate to assets held for sale * | [1] |  |  | (500) |
Impairment * |  | (3,837) | [2] | (2,930) | [1]
- Mining claims acquired |  | 4,000 |  |  |
Decommissioning asset acquired |  | 135 |  |  |
- Contractor |  | 117 |  |  |
Balance |  | 8,648 |  | 6,768 |
Glen Hume [Member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 2,661 |  | 0 |
- Option payments |  |  |  | 2,500 |
- Consumables and drilling |  | 1,074 |  | 161 |
- Labour |  | 60 |  | 0 |
- Power |  | 0 |  | 0 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | (3,837) | [2] | 0 | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 42 |  |  |
Balance |  | 0 |  | 2,661 |
Connemara North [Member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 300 |  | 0 |
- Option payments |  |  |  | 300 |
- Consumables and drilling |  | 71 |  | 0 |
- Labour |  | 41 |  | 0 |
- Power |  | 0 |  | 0 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | 0 | [2] | 0 | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 51 |  |  |
Balance |  | 463 |  | 300 |
Maligreen [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 0 |  | 0 |
- Option payments |  |  |  | 0 |
- Consumables and drilling |  | 14 |  | 0 |
- Labour |  | 47 |  | 0 |
- Power |  | 0 |  | 0 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | 0 | [2] | 0 | [1]
- Mining claims acquired |  | 4,000 |  |  |
Decommissioning asset acquired |  | 135 |  |  |
- Contractor |  | 0 |  |  |
Balance |  | 4,196 |  | 0 |
GG [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 3,523 |  | 3,441 |
- Option payments |  |  |  | 0 |
- Consumables and drilling |  | 16 |  | 28 |
- Labour |  | 46 |  | 35 |
- Power |  | 33 |  | 19 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | 0 | [2] | 0 | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 0 |  |  |
Balance |  | 3,618 |  | 3,523 |
Eagle Vulture, Mascot and Penzance [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 0 |  | 3,416 |
- Option payments |  |  |  | 0 |
- Consumables and drilling |  | 0 |  | 0 |
- Labour |  | 0 |  | 11 |
- Power |  | 0 |  | 3 |
Reallocate to assets held for sale * | [1] |  |  | (500) |
Impairment * |  | 0 | [2] | (2,930) | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 0 |  |  |
Balance |  | 0 |  | 0 |
Sabiwa [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 284 |  | 282 |
- Option payments |  |  |  | 0 |
- Consumables and drilling |  | 0 |  | 0 |
- Labour |  | 0 |  | 0 |
- Power |  | 6 |  | 2 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | 0 | [2] | 0 | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 0 |  |  |
Balance |  | 290 |  | 284 |
Abercorn [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 0 |  | 0 |
- Option payments |  |  |  | 0 |
- Consumables and drilling |  | 12 |  | 0 |
- Labour |  | 4 |  | 0 |
- Power |  | 0 |  | 0 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | 0 | [2] | 0 | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 0 |  |  |
Balance |  | 16 |  | 0 |
Valentine [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 0 |  | 0 |
- Option payments |  |  |  | 0 |
- Consumables and drilling |  | 31 |  | 0 |
- Labour |  | 10 |  | 0 |
- Power |  | 0 |  | 0 |
Reallocate to assets held for sale * | [1] |  |  | 0 |
Impairment * |  | 0 | [2] | 0 | [1]
- Mining claims acquired |  | 0 |  |  |
Decommissioning asset acquired |  | 0 |  |  |
- Contractor |  | 24 |  |  |
Balance |  | $ 65 |  | $ 0 |
[1] | Management determined the fair value of Eagle Vulture, Mascot and Penzance as the future sale price as agreed by independent parties in the sale contract that amounted to $500. The carrying amount of Eagle Vulture, Mascot and Penzance before the impairment was $3,430 and the write down resulted in an impairment expense of $2,930. The $500 carrying value was reallocated to Assets held for sale in December, 2020. The sale was completed on July 27, 2021.
[2] | Caledonia has completed sufficient work to establish that the potential orebody at the Glen Hume property will not meet Caledonia’s requirements in terms of size, grade and width. Accordingly, Caledonia will not exercise the option to acquire this property. The Group voluntarily changed its disclosure policy for exploration and evaluation assets to be disclosed separately as Exploration and evaluation assets rather than as part of Property, plant and equipment (refer to note 4(h)).

X
- Definition The amount of decrease in exploration and evaluation assets from reclassification to assets held for sale. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of impairment loss recognised in profit or loss for exploration and evaluation assets. + 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 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
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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 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 option payments. + References No definition available. + Details
Name: | cmcl_IncreaseDecreaseInExplorationAndEvaluationAssetsFromOptionPayments
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

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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

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_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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- Details
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Data Type: | na
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