CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares
REVENUE:
Total Revenue	$ 34,179	$ 15,110	$ 75,464	$ 29,943
OTHER OPERATING EXPENSES:
Cost of goods and services sold	9,923	6,550	24,814	14,399
Property holding costs	189	423	1,600	1,611
General and administrative costs	5,814	4,078	11,001	8,371
Loss from investment in Minera Santa Cruz S.A. (note 5)	2,265	263	2,477	73
Depreciation	273	482	633	809
Accretion of asset reclamation obligations (note 6)	288	116	582	221
Total other operating expenses	18,646	9,168	37,944	24,450
Operating loss	(8,723)	(2,618)	(13,130)	(10,051)
OTHER INCOME (EXPENSE):
Interest and other expense	354	(109)	220	(175)
(Loss) gain on sale of assets	(99)		(99)	11
(Loss) gain on sale of marketable equity securities (note 2)	(33)	840	(767)	840
Unrealized fair value loss on marketable equity securities (note 2)	(500)		(1,637)
Unrealized (loss) gain on derivatives (note 2)	(1)	(722)	(865)	1,069
Foreign currency gain	1,482	1,050	2,409	1,075
Total other income (expense)	1,203	1,059	(739)	2,820
Loss before income and mining taxes	(7,520)	(1,559)	(13,869)	(7,231)
Deferred income and mining tax recovery (expense) (note 7)	2,140	(153)	3,278	2,503
Net loss	(5,380)	(1,712)	(10,591)	(4,728)
OTHER COMPREHENSIVE (LOSS) INCOME:
Reclassification of unrealized gain on marketable securities disposed of during the period, net of taxes (note 2)		(840)		(840)
Unrealized gain (loss) on marketable equity securities, net of taxes		(236)		3,639
Comprehensive (loss)	$ (5,380)	$ (2,788)	$ (10,591)	$ (1,929)
Net loss per share (note 10):
Basic (in dollars per share) | $ / shares	$ (0.02)	$ (0.01)	$ (0.03)	$ (0.02)
Diluted (in dollars per share) | $ / shares	$ (0.02)	$ (0.01)	$ (0.03)	$ (0.02)
Weighted average common shares outstanding (thousands) (note 10):
Basic (in shares) | shares	337,087	308,523	337,075	304,074
Diluted (in shares) | shares	337,087	308,523	337,075	304,074
Shareholders' distribution declared per common share (note 8) | $ / shares			0.005	0.005
Gold and silver sales
REVENUE:
Total Revenue	$ 33,806	$ 15,110	$ 74,847	$ 29,943
Other revenue
REVENUE:
Total Revenue	373		617
Production costs applicable to sales
OTHER OPERATING EXPENSES:
Cost of goods and services sold	24,256	8,560	50,650	15,544
Mine development costs
OTHER OPERATING EXPENSES:
Cost of goods and services sold	710	720	1,090	1,835
Exploration costs
OTHER OPERATING EXPENSES:
Cost of goods and services sold	$ 9,107	$ 3,086	$ 20,561	$ 11,530