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OPERATING SEGMENT REPORTING - Reportable Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Segment Reporting      
Revenue $ 128,822 $ 67,724 $ 60,388
Revision of estimates and accretion of reclamation obligations (3,464) (2,061) (595)
Property holding costs (3,896) (3,879) (3,536)
Impairment of mineral property interests and property and equipment   (711)  
General and administrative expenses (23,163) (18,872) (12,734)
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization) (11,865) (44) 12,951
Depreciation 9,169 3,378 1,169
Interest and other expense (1,619) (938) 835
Revision of estimates and accretion of reclamation obligations (3,464) (2,061) (595)
Impairment of mineral property interests and property and equipment   (711)  
Gain on sale of assets (77) 11 24
Unrealized (loss) gain on derivative instrument (700) (200) 1,400
Foreign currency gain 3,922 694 581
Net loss before income and mining taxes (47,640) (26,003) 17,306
Mexico      
Operating Segment Reporting      
Property holding costs (2,264) (2,131) (1,642)
Impairment of mineral property interests and property and equipment   (711)  
General and administrative expenses (3,770) (3,772) (2,688)
Segment income (loss) 16,780 7,584 22,651
Impairment of mineral property interests and property and equipment   (711)  
MSC      
Operating Segment Reporting      
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization) (11,865) (44) 12,951
Segment income (loss) (11,865) (44) 12,951
Los Azules      
Operating Segment Reporting      
Property holding costs (68) (56) (405)
General and administrative expenses (1,046) (1,242) (646)
Segment income (loss) (7,129) (9,221) (2,700)
U.S.      
Operating Segment Reporting      
Property holding costs (1,397) (1,667) (1,489)
General and administrative expenses (6,562) (1,927) (228)
Segment income (loss) (13,103) (8,818) (6,382)
Canada      
Operating Segment Reporting      
Property holding costs (167) (25)  
General and administrative expenses (665) (92)  
Segment income (loss) (15,463) 330  
Total Segment      
Operating Segment Reporting      
Property holding costs (3,896) (3,879) (3,536)
Impairment of mineral property interests and property and equipment   (711)  
General and administrative expenses (12,043) (7,033) (3,562)
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization) (11,865) (44) 12,951
Segment income (loss) (30,780) (10,169) 26,520
Impairment of mineral property interests and property and equipment   (711)  
Corporate & Other      
Operating Segment Reporting      
Revision of estimates and accretion of reclamation obligations (3,464) (2,061) (595)
General and administrative expenses (11,120) (11,839) (9,172)
Depreciation (1,178) (1,453) (1,169)
Interest and other expense (1,619) (938)  
Revision of estimates and accretion of reclamation obligations (3,464) (2,061) (595)
Interest income and other income     835
Gain on sale of assets (77) 11 24
Loss on sale of marketable securities (3,324) 257 519
Foreign currency gain 3,922 694 581
Net loss before income and mining taxes (47,640)    
Gold and silver sales      
Operating Segment Reporting      
Revenue 128,175 67,465 60,388
Gold and silver sales | Mexico      
Operating Segment Reporting      
Revenue 66,151 55,845 60,388
Gold and silver sales | Canada      
Operating Segment Reporting      
Revenue 62,024 11,620  
Gold and silver sales | Total Segment      
Operating Segment Reporting      
Revenue 128,175 67,465 60,388
Other revenue      
Operating Segment Reporting      
Revenue 647 259  
Other revenue | U.S.      
Operating Segment Reporting      
Revenue 30    
Other revenue | Canada      
Operating Segment Reporting      
Revenue 617 259  
Other revenue | Total Segment      
Operating Segment Reporting      
Revenue 647 259  
Production costs applicable to sales      
Operating Segment Reporting      
Cost of goods and services sold (93,329) (45,180) (28,133)
Production costs applicable to sales | Mexico      
Operating Segment Reporting      
Cost of goods and services sold (37,429) (35,292) (28,133)
Production costs applicable to sales | Canada      
Operating Segment Reporting      
Cost of goods and services sold (55,900) (9,888)  
Production costs applicable to sales | Total Segment      
Operating Segment Reporting      
Cost of goods and services sold (93,329) (45,180) (28,133)
Mine development      
Operating Segment Reporting      
Cost of goods and services sold (3,667) (3,837) (3,866)
Mine development | Mexico      
Operating Segment Reporting      
Cost of goods and services sold (3,667) (745) (1,174)
Mine development | U.S.      
Operating Segment Reporting      
Cost of goods and services sold   (3,092) (2,692)
Mine development | Total Segment      
Operating Segment Reporting      
Cost of goods and services sold (3,667) (3,837) (3,866)
Exploration      
Operating Segment Reporting      
Cost of goods and services sold (34,802) (17,714) (7,959)
Exploration | Mexico      
Operating Segment Reporting      
Cost of goods and services sold (2,241) (5,610) (4,100)
Exploration | Los Azules      
Operating Segment Reporting      
Cost of goods and services sold (6,015) (7,923) (1,649)
Exploration | U.S.      
Operating Segment Reporting      
Cost of goods and services sold (5,174) (2,132) (1,973)
Exploration | Canada      
Operating Segment Reporting      
Cost of goods and services sold (21,372) (1,544)  
Exploration | Total Segment      
Operating Segment Reporting      
Cost of goods and services sold $ (34,802) (17,209) (7,722)
Other exploration costs | Corporate & Other      
Operating Segment Reporting      
Cost of goods and services sold   $ (505) $ (237)