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Note 17 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Line Items [Line Items]      
Deferred tax asset $ 1,545 $ 1,265  
Deferred tax liability (9,385) (5,412)  
Net deferred tax asset (liability) (7,840) [1] (4,147) [1] $ (3,066)
Property, plant, and equipment deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (9,328) (5,380)  
Net deferred tax asset (liability) (9,328) (5,380) (4,117)
Evaluation and exploration assets [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (47) (29)  
Net deferred tax asset (liability) (47) (29) (78)
Allowance for obsolete stock deferred tax asset [member]      
Statement Line Items [Line Items]      
Deferred tax asset 3 13  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 3 13 22
Prepayments deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (10) (3)  
Net deferred tax asset (liability) (10) (3) (4)
Unrealised foreign exchange gains (losses) [member]      
Statement Line Items [Line Items]      
Deferred tax asset 499 530  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 499 530 309
Trade and Other Payables 1 [Member]      
Statement Line Items [Line Items]      
Deferred tax asset 989 636  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 989 636  
Cash-settled awards [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 8  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 0 8 5
Provisions [member]      
Statement Line Items [Line Items]      
Deferred tax asset 54 60  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 54 60 $ 58
Other Temporary Differences 1 [Member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 18  
Deferred tax liability 0 0  
Net deferred tax asset (liability) $ 0 $ 18  
[1] The net deferred tax liability consists of a deferred tax asset of $194 (2020: $87, January 1, 2020: $63) from the South African operation and a net deferred tax liability of $8,034 (2020: $4,234, January 1, 2020: $3,129) due to the Zimbabwean 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.