Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Revenue	$ 21,938	$ 47,441
Cost of sales	(16,430)	(36,361)
Gross profit	5,508	11,080
Operating Income (Expenses):
Other operating income	0	1,505
Exploration expenses	(3,758)	(1,802)
Administrative expense	(7,262)	(6,017)
Impairment of mineral properties	(1,996)	0
Share-based payments expense	(127)	(190)
Interest expense	(2,131)	(1,665)
Total operating expense	(15,274)	(8,169)
Other Income/(Expenses)
Interest income	191	142
Gain/(loss) on foreign exchange	377	(12,761)
Accretion expense	(179)	(578)
Total other income/(expenses)	389	(13,197)
Income (loss) - before income taxes	(9,377)	(10,286)
Income tax benefit (expense)	(298)	2,440
Net income (loss)	(9,675)	(7,846)
Attributable to non-controlling interest	(122)	(528)
Attributable to equity share owners of the parent	(9,553)	(7,318)
Other Comprehensive Income (Loss) net of tax
Change in fair value of investment	(28)	(13)
Foreign currency translation adjustment	(28)	(2,824)
Total other comprehensive income (loss)	(56)	(2,837)
Total comprehensive income (loss)	$ (9,731)	$ (10,683)
Weighted average shares outstanding - basic and diluted	282,306,312	254,387,482
Net income (loss) per share - basic and diluted	$ (0.03)	$ (0.03)