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Note 9 - Production Costs - Components of Production Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Salaries and wages $ 13,905 $ 13,160 $ 13,440
Expense from cash-settled share-based payment transactions 107 43 311
Consumable materials 13,020 12,143 9,916
Electricity costs 6,383 9,313 8,701
Site restoration 84 58
Pre-feasibility exploration cost 301 411 410
Safety 525 592 323
On mine administration 2,159 3,569 3,004
Other production cost 17
$ 36,400 $ 39,315 [1] $ 36,180 [1]
[1] The Group initially applied IFRS 16 on January 1, 2019, using the modified retrospective approach. Under this approach, comparative information is not restated. There was no cumulative effect of initially applying IFRS 16 to recognise in retained earnings at the date of initial application.