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Segmented Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
customer
country
Dec. 31, 2016
USD ($)
customer
Disclosure of operating segments [line items]    
Number of countries where company has operations | country 4  
Revenue $ 816,828 $ 774,775
Depreciation and amortization (Note 10) (122,888) (115,955)
Exploration and project development (19,755) (11,334)
Interest income (expense) 1,462 1,382
Interest and financing expenses (7,185) (9,551)
(Loss) gain on disposition of assets 191 25,100
Share of loss from associates and dilution gain 2,052 7,946
Gain on derivatives (Note 7) 64 0
Foreign exchange gains (losses) 1,823 (9,054)
Gain on commodity, fuel swaps and foreign currency contracts 606 (4,944)
Reversals of impairment 61,554 0
Earnings before income taxes 182,485 176,271
Income tax (expense) recovery (59,034) (74,446)
Net earnings for the year 123,451 101,825
Capital expenditures 142,232 202,661
Total assets 1,993,332 1,898,141
Total liabilities 472,281 499,137
Other [member]    
Disclosure of operating segments [line items]    
Revenue 0 0
Depreciation and amortization (Note 10) (199) (529)
Exploration and project development (1,807) (4,196)
Interest income (expense) 340 879
Interest and financing expenses (138) (3,732)
(Loss) gain on disposition of assets 626 8,297
Share of loss from associates and dilution gain 0 7,946
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) 962 (22,905)
Gain on commodity, fuel swaps and foreign currency contracts 0 (4,944)
Reversals of impairment 19,442  
Earnings before income taxes 24,978 2,795
Income tax (expense) recovery (8,604) (15,179)
Net earnings for the year 16,374 (12,384)
Capital expenditures 430 290
Total assets 48,819 210,194
Total liabilities 35,805 100,276
PERU | Huaron [member]    
Disclosure of operating segments [line items]    
Revenue 129,085 105,707
Depreciation and amortization (Note 10) (13,464) (12,668)
Exploration and project development (1,713) (837)
Interest income (expense) 63 27
Interest and financing expenses (855) (673)
(Loss) gain on disposition of assets (154) 5
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) (92) (64)
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes 36,650 24,062
Income tax (expense) recovery (12,818) (10,021)
Net earnings for the year 23,832 14,041
Capital expenditures 8,412 8,854
Total assets 116,138 134,579
Total liabilities 46,184 45,986
PERU | Morococha [member]    
Disclosure of operating segments [line items]    
Revenue 120,244 92,889
Depreciation and amortization (Note 10) (9,693) (11,225)
Exploration and project development (1,629) (1,053)
Interest income (expense) 58 67
Interest and financing expenses (578) (436)
(Loss) gain on disposition of assets (117) 144
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) (38) (57)
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 42,112  
Earnings before income taxes 86,476 21,497
Income tax (expense) recovery (16,663) (4,351)
Net earnings for the year 69,813 17,146
Capital expenditures 9,283 8,034
Total assets 131,180 65,386
Total liabilities 36,058 23,171
MEXICO | Dolores [member]    
Disclosure of operating segments [line items]    
Revenue 197,748 189,288
Depreciation and amortization (Note 10) (67,515) (60,414)
Exploration and project development (2,316) (1,685)
Interest income (expense) 0 0
Interest and financing expenses 1,613 (630)
(Loss) gain on disposition of assets (291) (22)
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) 642 1,539
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes (503) 8,222
Income tax (expense) recovery 11,719 (10,697)
Net earnings for the year 11,216 (2,475)
Capital expenditures 85,379 113,227
Total assets 833,397 827,858
Total liabilities 176,464 199,127
MEXICO | Alamo Dorado [member]    
Disclosure of operating segments [line items]    
Revenue 17,958 45,843
Depreciation and amortization (Note 10) (23) (2,336)
Exploration and project development 0 0
Interest income (expense) 4 0
Interest and financing expenses (359) (420)
(Loss) gain on disposition of assets 540 136
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) (29) (393)
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes (8,474) 3,269
Income tax (expense) recovery 1,033 (3,495)
Net earnings for the year (7,441) (226)
Capital expenditures 0 0
Total assets 17,125 35,853
Total liabilities 8,163 8,880
MEXICO | La Colorada [member]    
Disclosure of operating segments [line items]    
Revenue 171,654 118,292
Depreciation and amortization (Note 10) (19,381) (9,999)
Exploration and project development (2,149) (186)
Interest income (expense) 0 0
Interest and financing expenses (467) (307)
(Loss) gain on disposition of assets (319) 16,525
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) (143) 13,887
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes 79,307 61,178
Income tax (expense) recovery (20,843) (21,860)
Net earnings for the year 58,464 39,318
Capital expenditures 21,963 64,519
Total assets 231,205 227,923
Total liabilities 65,145 52,636
ARGENTINA | Manantial Espejo [member]    
Disclosure of operating segments [line items]    
Revenue 111,642 144,048
Depreciation and amortization (Note 10) (5,236) (9,190)
Exploration and project development (4,588) 0
Interest income (expense) 525 389
Interest and financing expenses (2,969) (3,069)
(Loss) gain on disposition of assets 0 (8)
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) (1,373) (2,780)
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes (24,404) 42,097
Income tax (expense) recovery (1,108) (431)
Net earnings for the year (25,512) 41,666
Capital expenditures 8,590 2,868
Total assets 125,088 111,260
Total liabilities 43,408 40,788
ARGENTINA | Navidad [member]    
Disclosure of operating segments [line items]    
Revenue 0 0
Depreciation and amortization (Note 10) (88) (120)
Exploration and project development (2,894) (3,377)
Interest income (expense) 0 19
Interest and financing expenses (99) (66)
(Loss) gain on disposition of assets 0 0
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) (644) 208
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes (3,570) (4,536)
Income tax (expense) recovery (85) (33)
Net earnings for the year (3,655) (4,569)
Capital expenditures 27 5
Total assets 194,225 193,195
Total liabilities 1,296 1,112
BOLIVIA | San Vicente [member]    
Disclosure of operating segments [line items]    
Revenue 68,497 78,708
Depreciation and amortization (Note 10) (7,181) (9,474)
Exploration and project development 0 0
Interest income (expense) 0 1
Interest and financing expenses (232) (218)
(Loss) gain on disposition of assets (455) 23
Share of loss from associates and dilution gain 0 0
Gain on derivatives (Note 7) 0  
Foreign exchange gains (losses) 1,045 1,511
Gain on commodity, fuel swaps and foreign currency contracts 0 0
Reversals of impairment 0  
Earnings before income taxes 14,592 17,687
Income tax (expense) recovery (5,305) (8,379)
Net earnings for the year 9,287 9,308
Capital expenditures 8,146 4,864
Total assets 85,869 91,893
Total liabilities 30,819 $ 27,161
CANADA | Pas Corp [member]    
Disclosure of operating segments [line items]    
Revenue 0  
Depreciation and amortization (Note 10) (108)  
Exploration and project development (2,659)  
Interest income (expense) 472  
Interest and financing expenses (3,101)  
(Loss) gain on disposition of assets 361  
Share of loss from associates and dilution gain 2,052  
Gain on derivatives (Note 7) 64  
Foreign exchange gains (losses) 1,493  
Gain on commodity, fuel swaps and foreign currency contracts 606  
Reversals of impairment 0  
Earnings before income taxes (22,567)  
Income tax (expense) recovery (6,360)  
Net earnings for the year (28,927)  
Capital expenditures 2  
Total assets 210,286  
Total liabilities $ 28,939  
100% of Concentrate and Silver and Gold Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Number of significant customers | customer 16  
Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Number of significant customers | customer 7 7
Customer A [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 23.00% 18.00%
Customer B [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 16.00% 16.00%
Customer C [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 15.00% 14.00%
Customer D [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 14.00% 10.00%
Customer E [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 8.00% 10.00%
Customer F [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 6.00% 9.00%
Customer G [member] | Sales Revenue [member] | Customer Concentration Risk [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 5.00% 7.00%