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Note 16 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]      
Deferred tax asset $ 1,409 $ 1,545  
Deferred tax liability (6,330) (9,385)  
Net deferred tax asset (liability) (4,921) (7,840) $ (4,147)
Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) [1] (4,921) (7,840)  
Property, plant, and equipment deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (6,323) (9,328)  
Net deferred tax asset (liability) (6,323) (9,328) (5,380)
Property, plant, and equipment deferred tax liability [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (6,323) (9,328)  
Evaluation and exploration assets [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (2) 0  
Net deferred tax asset (liability) (2) (47) (29)
Evaluation and exploration assets [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (2) 0  
Allowance for obsolete stock deferred tax asset [member]      
Statement Line Items [Line Items]      
Deferred tax liability 0 (47)  
Net deferred tax asset (liability) (163) 3 13
Allowance for obsolete stock (163) 0  
Allowance for obsolete stock deferred tax asset [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (163) (47)  
Prepayments deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 3  
Deferred tax liability (5) 0  
Net deferred tax asset (liability) (5) (10) (3)
Prepayments deferred tax liability [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (5) 3  
Unrealised foreign exchange gains (losses) [member]      
Statement Line Items [Line Items]      
Deferred tax asset 733 0  
Deferred tax liability 0 (10)  
Net deferred tax asset (liability) 733 499 530
Unrealised foreign exchange gains (losses) [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 733 (10)  
Trade and Other Payables 1 [Member]      
Statement Line Items [Line Items]      
Deferred tax asset 814 499  
Deferred tax liability 0 0  
Trade and Other Payables 1 [Member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 814 499  
Cash-settled awards [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 989  
Deferred tax liability 0 0  
Net deferred tax asset (liability)   0 8
Cash-settled awards [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 0 989  
Provisions [member]      
Statement Line Items [Line Items]      
Deferred tax asset 25 0  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 25 54 $ 60
Provisions [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 25 0  
Other Temporary Differences 1 [Member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 54  
Deferred tax liability 0 0  
Other Temporary Differences 1 [Member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) $ 0 $ 54  
[1] The net deferred tax liability consists of a deferred tax asset of $202 (2021: $194) from the South African operation and a net deferred tax liability of $5,123 (2021: $8,034) due to the Blanket Mine operation. The amounts are in different tax jurisdictions and cannot be offset. The amounts are presented as part of Non-current assets and Non-current liabilities in the Statements of financial position. The deferred tax asset recognised is supported by evidence of probable future taxable income.