Mining Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Mining rights, beginning	$ 16,475	$ 3,388
Additions		14,612
Amortization	(100)	(100)
Exchange differences	622	(1,425)
Mining rights, ending		16,475
Fomicruz Agreement
Mining rights, beginning	3,288	3,388
Additions		0
Amortization	(100)	(100)
Exchange differences	0	0
Mining rights, ending	3,188	3,288
Minera Aquiline Argentina
Mining rights, beginning	13,187	0
Additions		14,612
Amortization	0	0
Exchange differences	622	(1,425)
Mining rights, ending	$ 13,809	$ 13,187