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Consolidated Statements of Profit or Loss and Other Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Revenue $ 69,762 $ 61,992 $ 48,977
Royalties (3,498) (2,923) (2,455)
Production costs (36,180) (32,086) (30,019)
Depreciation (3,763) (3,491) (3,322)
Gross profit 26,321 23,492 13,181
Other income 2,594 1,330 110
Other expenses (195) (55)
Administrative expenses (5,911) (7,263) (7,622)
Equity-settled share-based payment expense (835) (170) (24)
Cash settled share-based payment expense (976) (618)
Sale of Blanket Mine treasury 3,202
Net Foreign exchange gain (380) (505) 2,850
Loss on settlement of hedge (435)
Operating profit 20,618 18,978 8,495
Finance income 38 16 1
Finance expense (69) (192) (536)
Profit before tax 20,587 18,802 7,960
Tax expense (8,691) (7,717) (2,370)
Profit for the year 11,896 11,085 5,590
Other comprehensive income      
Foreign currency translation differences of foreign operations 373 262 (3,291)
Tax on other comprehensive income 199
Total comprehensive income for the year 12,269 11,347 2,498
Profit attributable to:      
Owners of the Company 9,384 8,526 4,779
Non-controlling interests 2,512 2,559 811
Profit for the year 11,896 11,085 5,590
Total comprehensive income attributable to:      
Owners of the Company 9,757 8,788 1,687
Non-controlling interests 2,512 2,559 811
Total comprehensive income for the year $ 12,269 $ 11,347 $ 2,498
Earnings per share      
Basic earnings -per share ($) (in dollars per share) $ 0.86 $ 0.79 $ 0.45
Diluted earnings - per share ($) (in dollars per share) $ 0.86 $ 0.79 $ 0.45