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Note 18 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Line Items [Line Items]      
Balance at beginning of period $ 126,479    
Additions* 31,269 $ 24,778  
Impairments@ (498) 0 $ (144)
Balance at end of period 149,102 126,479  
Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 165,862 141,326  
Additions* [1] 31,269 24,778  
Derecognised plant and equipment (192) (238)  
Reallocations between asset classes 0 [2] 0  
Foreign exchange movement (171) (4)  
Impairments@ [3] (1,630)    
Balance at end of period 195,138 165,862 141,326
Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment (230) (56)  
Foreign exchange movement (30) (3)  
Impairments@ (1,133)    
Balance at beginning of period 39,383 34,814  
Depreciation for the year 8,046 4,628  
Balance at end of period 46,036 39,383 34,814
Land and buildings [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 5,311    
Balance at end of period 7,546 5,311  
Land and buildings [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 11,757 10,833  
Additions* [1] 318 1  
Derecognised plant and equipment (192) 0  
Reallocations between asset classes 3,120 [2] 930  
Foreign exchange movement (25) (7)  
Impairments@ [3] 0    
Balance at end of period 14,978 11,757 10,833
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment (230) 0  
Foreign exchange movement (1) 3  
Impairments@ 0    
Balance at beginning of period 6,446 5,413  
Depreciation for the year 1,217 1,030  
Balance at end of period 7,432 6,446 5,413
Mining assets [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 101,866    
Balance at end of period 99,880 101,866  
Mining assets [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 108,839 90,542  
Additions* [1] 25,529 19,507  
Derecognised plant and equipment 0 0  
Reallocations between asset classes (24,913) [2] (1,210)  
Foreign exchange movement 0 0  
Impairments@ [3] (65)    
Balance at end of period 109,390 108,839 90,542
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment 0 0  
Foreign exchange movement 0 0  
Impairments@ 0    
Balance at beginning of period 6,973 6,325  
Depreciation for the year 2,537 648  
Balance at end of period 9,510 6,973 6,325
Plant and equipment [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 17,959    
Balance at end of period 38,814 17,959  
Plant and equipment [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 40,644 36,395  
Additions* [1] 3,531 4,221  
Derecognised plant and equipment 0 (238)  
Reallocations between asset classes 21,785 [2] 280  
Foreign exchange movement (76) (14)  
Impairments@ [3] (1,565)    
Balance at end of period 64,319 40,644 36,395
Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment 0 (56)  
Foreign exchange movement 0 0  
Impairments@ (1,133)    
Balance at beginning of period 22,685 20,050  
Depreciation for the year 3,953 2,691  
Balance at end of period 25,505 22,685 20,050
Fixtures and fittings [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 386    
Balance at end of period 384 386  
Fixtures and fittings [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 1,235 1,018  
Additions* [1] 134 219  
Derecognised plant and equipment 0 0  
Reallocations between asset classes 8 [2] 0  
Foreign exchange movement (35) (2)  
Impairments@ [3] 0    
Balance at end of period 1,342 1,235 1,018
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment 0 0  
Foreign exchange movement (27) (6)  
Impairments@ 0    
Balance at beginning of period 849 753  
Depreciation for the year 136 102  
Balance at end of period 958 849 753
Motor vehicles [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 565    
Balance at end of period 538 565  
Motor vehicles [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 2,995 2,538  
Additions* [1] 176 458  
Derecognised plant and equipment 0 0  
Reallocations between asset classes 0 [2] 0  
Foreign exchange movement (2) (1)  
Impairments@ [3] 0    
Balance at end of period 3,169 2,995 2,538
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment 0 0  
Foreign exchange movement (2) 0  
Impairments@ 0    
Balance at beginning of period 2,430 2,273  
Depreciation for the year 203 157  
Balance at end of period 2,631 2,430 2,273
Solar plant [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 392    
Balance at end of period 1,940 392  
Solar plant [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period [4] 392 0  
Additions* [1],[4] 1,581 372  
Derecognised plant and equipment [4] 0 0  
Reallocations between asset classes [4] 0 [2] 0  
Foreign exchange movement [4] (33) 20  
Impairments@ [3],[4] 0    
Balance at end of period [4] 1,940 392 0
Solar plant [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Derecognised plant and equipment 0 0  
Foreign exchange movement 0 0  
Impairments@ 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 an amount of $19,413 (2020: $6,476) relating to capital work in progress (“CWIP”) and contains $17 ( December 31, 2020: $53) of borrowing costs capitalised from the term loan. As at year end $42,145 of CWIP was included in the cost closing balance (2020: $85,479).
[2] Included in the reallocation between asset classes is an amount of $18,509 for the Central Shaft.
[3] Included in impairments are Gensets at a cost of $1,001 and Guide ropes at a total cost of $310. These assets were impaired as they are no longer in a working conditions as intended for the use in production or day to day operations.
[4] On July 6, 2020 the Board appointed Voltalia as the contractor for the engineering, procuring and constructing of a solar plant to be owned by a subsidiary of the Company and supply Blanket Mine with power. All solar costs that were incurred before July 6, 2020 were accounted for as other expenses and accounted through profit or loss. Solar costs incurred after approval by the Board are accounted for as Property, plant and equipment as it became clear and probable that future economic benefits will flow to the project. The 40-hectare site for the project has been cleared and fenced and is ready for civil work to commence. Construction of the 12MWac solar plant is expected to be completed in the second quarter of 2022. Included in Prepayments is an advance payment to Voltalia to the amount of $1,821 in terms of the EPC agreement and $704 for equipment. These items were delivered at the date of approval of these consolidated financial statements. Also included in Prepayments is an amount of $426 to entities in Zimbabwe for civil and construction work related to the solar plant. Refer to note 21.