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Note 17 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | $ 149,102 |  |  |
Additions* |  | 48,220 | $ 31,479 |  |
Impairments@ |  | (8,209) | (498) |  | $ 0
Balance at end of period |  | 178,983 | 149,102 |  |
Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 195,138 | 165,862 |  |
Additions* |  | 47,348 | 31,479 | [1] |
Impairments@ |  | (9,516) | (1,630) | [2] |
Derecognised plant and equipment |  |  | (402) |  |
Reallocations between asset classes # |  | 0 | 0 | [3] |
Foreign exchange movement |  | (16) | (171) |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 872 |  |  |
Balance at end of period |  | 233,826 | 195,138 |  | 165,862
Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | (1,133) |  |
Derecognised plant and equipment |  | (1,307) | (230) |  |
Foreign exchange movement |  | (27) | (30) |  |
Balance at beginning of period |  | 46,036 | 39,383 |  |
Depreciation for the year |  | 10,141 | 8,046 |  |
Balance at end of period |  | 54,843 | 46,036 |  | 39,383
Land and buildings [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 7,100 |  |  |
Balance at end of period |  | 6,844 | 7,100 |  |
Land and buildings [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 14,435 | 11,315 |  |
Additions* |  | 0 | 0 | [1] |
Impairments@ |  | 0 | 0 | [2] |
Derecognised plant and equipment |  |  | 0 |  |
Reallocations between asset classes # |  | 759 | 3,120 | [3] |
Foreign exchange movement |  | 0 | 0 |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 0 |  |  |
Balance at end of period |  | 15,194 | 14,435 |  | 11,315
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | 0 |  |
Derecognised plant and equipment |  | 0 | 0 |  |
Foreign exchange movement |  | 0 | 0 |  |
Balance at beginning of period |  | 7,335 | 6,233 |  |
Depreciation for the year |  | 1,015 | 1,102 |  |
Balance at end of period |  | 8,350 | 7,335 |  | 6,233
Right-of-use assets [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 446 |  |  |
Balance at end of period |  | 295 | 446 |  |
Right-of-use assets [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 543 | 442 |  |
Additions* |  | 0 | 528 | [1] |
Impairments@ |  | 0 | 0 | [2] |
Derecognised plant and equipment |  |  | (402) |  |
Reallocations between asset classes # |  | 0 | 0 | [3] |
Foreign exchange movement |  | (18) | (25) |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 0 |  |  |
Balance at end of period |  | 525 | 543 |  | 442
Right-of-use assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | 0 |  |
Derecognised plant and equipment |  | 0 | (230) |  |
Foreign exchange movement |  | (4) | (1) |  |
Balance at beginning of period |  | 97 | 213 |  |
Depreciation for the year |  | 137 | 115 |  |
Balance at end of period |  | 230 | 97 |  | 213
Mining assets [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 65,004 |  |  |
Balance at end of period |  | 69,786 | 65,004 |  |
Mining assets [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 73,914 | 23,983 |  |
Additions* |  | 0 | 678 | [1] |
Impairments@ |  | (8,518) | 0 | [2] |
Derecognised plant and equipment |  |  | 0 |  |
Reallocations between asset classes # |  | 15,886 | 49,253 | [3] |
Foreign exchange movement |  | 0 | 0 |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 872 |  |  |
Balance at end of period |  | 82,154 | 73,914 |  | 23,983
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | 0 |  |
Derecognised plant and equipment |  | (532) | 0 |  |
Foreign exchange movement |  | 0 | 0 |  |
Balance at beginning of period |  | 8,910 | 6,443 |  |
Depreciation for the year |  | 3,990 | 2,467 |  |
Balance at end of period |  | 12,368 | 8,910 |  | 6,443
Assets under construction and decommissioning assets [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period | [4] | 34,876 |  |  |
Balance at end of period | [4] | 45,760 | 34,876 |  |
Assets under construction and decommissioning assets [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 35,476 | 84,856 |  |
Additions* |  | 31,711 | 24,851 | [1] |
Impairments@ |  | 0 | (65) | [2] |
Derecognised plant and equipment |  |  | 0 |  |
Reallocations between asset classes # |  | (20,734) | (74,166) | [3] |
Foreign exchange movement |  | 0 | 0 |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 0 |  |  |
Balance at end of period |  | 46,453 | 35,476 |  | 84,856
Assets under construction and decommissioning assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ | [4] |  | 0 |  |
Derecognised plant and equipment | [4] | 0 | 0 |  |
Foreign exchange movement | [4] | 0 | 0 |  |
Balance at beginning of period | [4] | 600 | 530 |  |
Depreciation for the year | [4] | 93 | 70 |  |
Balance at end of period | [4] | 693 | 600 |  | 530
Plant and equipment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 38,814 |  |  |
Balance at end of period |  | 41,228 | 38,814 |  |
Plant and equipment [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 64,319 | 40,644 |  |
Additions* |  | 3,049 | 3,531 | [1] |
Impairments@ |  | (998) | (1,565) | [2] |
Derecognised plant and equipment |  |  | 0 |  |
Reallocations between asset classes # |  | 4,089 | 21,785 | [3] |
Foreign exchange movement |  | 26 | (76) |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 0 |  |  |
Balance at end of period |  | 70,485 | 64,319 |  | 40,644
Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | (1,133) |  |
Derecognised plant and equipment |  | (775) | 0 |  |
Foreign exchange movement |  | 0 | 0 |  |
Balance at beginning of period |  | 25,505 | 22,685 |  |
Depreciation for the year |  | 4,527 | 3,953 |  |
Balance at end of period |  | 29,257 | 25,505 |  | 22,685
Fixtures and fittings [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 384 |  |  |
Balance at end of period |  | 463 | 384 |  |
Fixtures and fittings [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 1,342 | 1,235 |  |
Additions* |  | 243 | 134 | [1] |
Impairments@ |  | 0 | 0 | [2] |
Derecognised plant and equipment |  |  | 0 |  |
Reallocations between asset classes # |  | 0 | 8 | [3] |
Foreign exchange movement |  | (22) | (35) |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 0 |  |  |
Balance at end of period |  | 1,563 | 1,342 |  | 1,235
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | 0 |  |
Derecognised plant and equipment |  | 0 | 0 |  |
Foreign exchange movement |  | (21) | (27) |  |
Balance at beginning of period |  | 958 | 849 |  |
Depreciation for the year |  | 163 | 136 |  |
Balance at end of period |  | 1,100 | 958 |  | 849
Motor vehicles [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 538 |  |  |
Balance at end of period |  | 469 | 538 |  |
Motor vehicles [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 3,169 | 2,995 |  |
Additions* |  | 147 | 176 | [1] |
Impairments@ |  | 0 | 0 | [2] |
Derecognised plant and equipment |  |  | 0 |  |
Reallocations between asset classes # |  | 0 | 0 | [3] |
Foreign exchange movement |  | (2) | (2) |  |
Acquisition of Bilboes oxide assets (Tribute) |  | 0 |  |  |
Balance at end of period |  | 3,314 | 3,169 |  | 2,995
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | 0 |  |
Derecognised plant and equipment |  | 0 | 0 |  |
Foreign exchange movement |  | (2) | (2) |  |
Balance at beginning of period |  | 2,631 | 2,430 |  |
Depreciation for the year |  | 216 | 203 |  |
Balance at end of period |  | 2,845 | 2,631 |  | 2,430
Solar plant [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period |  | 1,940 |  |  |
Balance at end of period |  | 14,138 | 1,940 |  |
Solar plant [member] | Gross carrying amount [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Balance at beginning of period | [5] | 1,940 | 392 |  |
Additions* | [5] | 12,198 | 1,581 | [1] |
Impairments@ | [5] | 0 | 0 | [2] |
Derecognised plant and equipment | [5] |  | 0 |  |
Reallocations between asset classes # | [5] | 0 | 0 | [3] |
Foreign exchange movement | [5] | 0 | (33) |  |
Acquisition of Bilboes oxide assets (Tribute) | [5] | 0 |  |  |
Balance at end of period | [5] | 14,138 | 1,940 |  | 392
Solar plant [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Impairments@ |  |  | 0 |  |
Derecognised plant and equipment |  | 0 | 0 |  |
Foreign exchange movement |  | 0 | 0 |  |
Balance at beginning of period |  | 0 | 0 |  |
Depreciation for the year |  | 0 | 0 |  |
Balance at end of period |  | $ 0 | $ 0 |  | $ 0
[1] | Included in additions is the change in estimate for the decommissioning asset of ($468) (2021: ($408)), refer to note 28.
[2] | Included in the 2022 impairments are development asset costs of $8,518 that predominantly relates to prospective areas above 750 meters at Blanket which are not included in the LoMP. Also included in the 2022 impairments are generator cost of $791 and loader bottom decks at a cost of $101, these assets were no longer in working conditions. Included in the 2021 impairments are gensets cost of $1,001 and guide ropes cost of $310 that were no longer in working condition. The carrying amount for these impaired assets were impaired to $Nil.
[3] | Included in the reallocation between asset classes is an amount of $18,509 for the Central Shaft that was reallocated from CWIP (Mine development, infrastructure and other) to Plant and equipment at the time of the commissioning of the Central Shaft.
[4] | Accumulated depreciation and depreciation under Assets under construction and decommissioning assets include depreciation on decommissioning assets.
[5] | The solar plant was fully commissioned on February 2, 2023 and the sale agreement between Caledonia Mining Corporation Plc and Caledonia Mining Services (Private) Limited was concluded for the sale of the solar plant. Depreciation on the solar plant started on February 2, 2023 and the power purchase agreement, between Caledonia Mining Services (Private) Limited and Blanket Mine, became effective. In December 2022, the Caledonia board approved a proposal for Caledonia Mining Services (PvT) Ltd (which owns the solar plant) to issue loan note instruments (“bonds”) up to a value of $12,000. The decision was taken in order to optimise the capital structure of the Group and provide additional debt instruments to the Zimbabwean financial market. The bonds have an interest rate of 9.5% payable bi-annually and have a tenor of 3 years from the date of issue. The bond repayments are guaranteed by the Company and post December 31, 2022 $4.5 million was issued to Zimbabwean registered commercial entities.

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