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OPERATING SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Operating Segment Reporting
Revenue from gold and silver sales	$ 36,383	$ 33,806	$ 51,966	$ 74,847
Revision of estimates and accretion of reclamation obligations	(427)	(288)	(888)	(582)
Depreciation and depletion	(7,007)	(4,099)	(10,013)	(7,189)
Loss from investment in Minera Santa Cruz S.A.	(4,137)	(2,265)	(6,447)	(2,477)
Advanced projects	(2,095)	(2,756)	(4,741)	(5,760)
Segment income (loss)	(7,427)	(5,538)	(15,105)	(6,401)
General and Administrative and other	(6,088)	(1,982)	(8,428)	(7,468)
Gross profit	4,677	9,092	6,105	23,320
Interest and other expense	(2,783)	354	(3,296)	220
Revision of estimates and accretion of reclamation obligations	(427)	(288)	(888)	(582)
Foreign currency (loss) gain	(537)	1,482	(374)	2,409
Net (loss) income before tax	(13,515)	(7,520)	(23,533)	(13,869)
Long-Lived Assets	558,031		558,031		$ 557,565
Investment in MSC	119,347		119,347		127,814
Mexico
Operating Segment Reporting
Depreciation and depletion	(218)	(573)	(362)	(1,405)
Advanced projects	(1,705)	(1,165)	(4,155)	(3,127)
Segment income (loss)	664	3,680	(637)	12,160
Gross profit	2,369	5,174	3,518	16,587
MSC
Operating Segment Reporting
Loss from investment in Minera Santa Cruz S.A.	(4,137)	(2,265)	(6,447)	(2,477)
Segment income (loss)	(4,137)	(2,265)	(6,447)	(2,477)
Los Azules
Operating Segment Reporting
Segment income (loss)	(518)	(2,341)	(1,637)	(5,866)
U.S.
Operating Segment Reporting
Depreciation and depletion	(2,568)		(2,720)
Advanced projects	(390)	(1,591)	(586)	(2,633)
Segment income (loss)	(563)	(2,742)	(1,487)	(5,784)
Gross profit	1,119		1,001
Canada
Operating Segment Reporting
Depreciation and depletion	(4,221)	(3,526)	(6,931)	(5,784)
Segment income (loss)	(2,873)	(1,870)	(4,897)	(4,434)
Gross profit	1,189	3,918	1,586	6,733
MSC
Operating Segment Reporting
Loss from investment in Minera Santa Cruz S.A.	(4,137)	(2,265)	(6,447)	(2,477)
Investment in MSC	119,347		119,347		127,814	$ 150,064
Canada
Operating Segment Reporting
Revenue from gold and silver sales	16,049	19,425	24,992	35,049
Long-Lived Assets	85,437		85,437		84,119
Mexico
Operating Segment Reporting
Revenue from gold and silver sales	8,812	14,381	14,610	39,798
Long-Lived Assets	23,783		23,783		26,524
United States
Operating Segment Reporting
Revenue from gold and silver sales	11,522		12,364
Long-Lived Assets	137,974		137,974		127,617
Argentina
Operating Segment Reporting
Long-Lived Assets	310,837		310,837		319,305
Argentina | MSC
Operating Segment Reporting
Investment in MSC	119,300		119,300		$ 127,800
Gold and silver sales
Operating Segment Reporting
Revenue from gold and silver sales	36,383	33,806	51,966	74,847
Gold and silver sales | Mexico
Operating Segment Reporting
Revenue from gold and silver sales	8,812	14,381	14,610	39,798
Gold and silver sales | U.S.
Operating Segment Reporting
Revenue from gold and silver sales	11,522		12,364
Gold and silver sales | Canada
Operating Segment Reporting
Revenue from gold and silver sales	16,049	19,425	24,992	35,049
Production costs applicable to sales
Operating Segment Reporting
Production costs applicable to sales	(24,699)	(20,615)	(35,848)	(44,338)
Production costs applicable to sales | Mexico
Operating Segment Reporting
Production costs applicable to sales	(6,225)	(8,634)	(10,730)	(21,806)
Production costs applicable to sales | U.S.
Operating Segment Reporting
Production costs applicable to sales	(7,835)		(8,643)
Production costs applicable to sales | Canada
Operating Segment Reporting
Production costs applicable to sales	(10,639)	(11,981)	(16,475)	(22,532)
Exploration
Operating Segment Reporting
Production costs applicable to sales	(5,872)	(9,609)	(10,022)	(21,484)
Exploration | Mexico
Operating Segment Reporting
Production costs applicable to sales		(329)		(1,300)
Exploration | Los Azules
Operating Segment Reporting
Production costs applicable to sales	(518)	(2,341)	(1,637)	(5,866)
Exploration | U.S.
Operating Segment Reporting
Production costs applicable to sales	(1,292)	(1,151)	(1,902)	(3,151)
Exploration | Canada
Operating Segment Reporting
Production costs applicable to sales	$ (4,062)	$ (5,788)	$ (6,483)	$ (11,167)

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