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Consolidated Statements of Profit or Loss and Other Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Revenue $ 68,399 $ 69,762 [1] $ 61,992
Royalties (3,426) (3,498) [1] (2,923)
Production costs (39,315) (36,180) [1] (32,086)
Depreciation (4,071) (3,763) [1] (3,491)
Gross profit 21,587 26,321 [1] 23,492
Other income 7,101 2,594 [1] 1,330
Other expenses (336) (14) [1] (55)
Impairment loss on trade receivables (181) [1]
Administrative expenses (6,465) (5,911) [1] (7,263)
Equity-settled share-based expense (14) (835) [1] (170)
Cash-settled share-based payment expense (315) (976) [1] (618)
Sale of Blanket Mine treasury [1] 3,202
Net Foreign exchange gain/(loss) 223 (380) [1] (505)
Margin call on hedge (360) [1] (435)
Operating profit 21,421 20,618 18,978
Finance income 53 38 16
Finance cost (273) (69) (192)
Profit before tax 21,201 20,587 18,802
Tax expense (7,445) (8,691) (7,717)
Profit for the year 13,756 11,896 11,085
Other comprehensive income      
Foreign currency translation differences of foreign operations (676) 373 262
Total comprehensive income for the year 13,080 12,269 11,347
Profit attributable to:      
Owners of the Company 10,766 9,384 8,526
Non-controlling interests 2,990 2,512 2,559
Profit for the year 13,756 11,896 11,085
Total comprehensive income attributable to:      
Owners of the Company 10,090 9,757 8,788
Non-controlling interests 2,990 2,512 2,559
Total comprehensive income for the year $ 13,080 $ 12,269 $ 11,347
Earnings per share      
Basic earnings - per share ($) (in dollars per share) $ 0.99 $ 0.86 $ 0.79
Diluted earnings per share ($) (in dollars per share) $ 0.99 $ 0.86 $ 0.79
[1] Restated, refer note 4(a).