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Segmented and geographic information, and major customers (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of operating segments [abstract]  
Schedule of Operating Segments
The following segmented information is presented as at and during the years ended December 31, 2017 and 2016.

 
  
As at December 31, 2017
    
As at December 31, 2016
  
 
  
Mexican Operations
    
U.S.
Operations
    
Corporate and Other
    
Total
    
Mexican Operations
    
U.S.
Operations
    
Corporate and Other
    
Total
  
 
                                                
Cash and cash equivalents
  
$
5,963
    
$
1,791
    
$
1,571
    
$
9,325
    
$
1,875
    
$
3,511
    
$
18,669
    
$
24,055
  
Trade and other receivables
    
4,901
      
1,711
      
19
      
6,631
      
2,855
      
1,106
      
41
      
4,002
  
Inventories
    
6,301
      
3,065
      
-
      
9,366
      
3,738
      
2,880
      
-
      
6,618
  
Prepaid expenses
    
346
      
305
      
218
      
869
      
840
      
353
      
192
      
1,385
  
Available-for-sale investment
    
-
      
-
      
-
      
-
      
-
      
-
      
503
      
503
  
Restricted cash
    
160
      
171
      
-
      
331
      
-
      
151
      
-
      
151
  
Long-term investments
    
-
      
-
      
4
      
4
      
-
      
-
      
28
      
28
  
Property, plant and equipment
    
59,686
      
40,570
      
45
      
100,301
      
42,474
      
38,022
      
52
      
80,548
  
Total assets
  
$
77,357
    
$
47,613
    
$
1,857
    
$
126,827
    
$
51,782
    
$
46,023
    
$
19,485
    
$
117,290
  
 
                                                                
Trade and other payables
  
$
5,893
    
$
2,608
    
$
1,892
    
$
10,393
    
$
4,144
    
$
2,422
    
$
2,161
    
$
8,727
  
Other long-term liabilities
    
-
      
469
      
95
      
564
      
-
      
448
      
434
      
882
  
Credit facilities
    
-
      
-
      
-
      
-
      
-
      
-
      
7,758
      
7,758
  
Pre-payment facility
    
15,000
      
-
      
-
      
15,000
      
-
      
-
      
-
      
-
  
Post-employment benefit obligations
    
-
      
8,618
      
-
      
8,618
      
-
      
8,116
      
-
      
8,116
  
Decommissioning provision
    
1,904
      
2,044
      
-
      
3,948
      
1,834
      
1,995
      
-
      
3,829
  
Deferred tax liabilities (assets)
    
872
      
(626
)
    
-
      
246
      
834
      
-
      
-
      
834
  
Total liabilities
  
$
23,669
    
$
13,113
    
$
1,987
    
$
38,769
    
$
6,812
    
$
12,981
    
$
10,353
    
$
30,146
  

 
 
  
Year ended December 31, 2017
    
Year ended December 31, 2016
  
 
  
Mexican Operations
    
U.S.
Operations
    
Corporate and Other
    
Total
    
Mexican Operations
    
U.S.
Operations
    
Corporate and Other
    
Total
  
 
                                                
Revenue
  
$
21,512
    
$
32,768
    
$
-
    
$
54,280
    
$
23,322
    
$
35,544
    
$
-
    
$
58,866
  
Cost of sales
    
(10,195
)
    
(29,843
)
    
-
      
(40,038
)
    
(17,679
)
    
(28,466
)
    
-
      
(46,145
)
Depletion and amortization
    
(3,247
)
    
(3,452
)
    
(10
)
    
(6,709
)
    
(3,534
)
    
(3,839
)
    
(15
)
    
(7,388
)
Care, maintenance and restructuring costs
    
(60
)
    
(473
)
    
(168
)
    
(701
)
    
(399
)
    
(495
)
    
(99
)
    
(993
)
Corporate general and administrative
    
-
      
-
      
(6,651
)
    
(6,651
)
    
-
      
-
      
(5,355
)
    
(5,355
)
Exploration costs
    
(2,407
)
    
(319
)
    
-
      
(2,726
)
    
(690
)
    
(991
)
    
-
      
(1,681
)
Accretion on decommissioning provision
    
(144
)
    
(41
)
    
-
      
(185
)
    
(112
)
    
(40
)
    
-
      
(152
)
Interest and financing income (expense)
    
(35
)
    
-
      
(688
)
    
(723
)
    
2
      
-
      
(2,339
)
    
(2,337
)
Foreign exchange gain (loss)
    
(308
)
    
-
      
83
      
(225
)
    
384
      
-
      
(44
)
    
340
  
Loss on disposal of assets
    
-
      
-
      
-
      
-
      
-
      
-
      
(20
)
    
(20
)
Loss on available-for-sale investment
    
-
      
-
      
(11
)
    
(11
)
    
-
      
-
      
-
      
-
  
Write-down of equipment
    
-
      
(204
)
    
-
      
(204
)
    
-
      
-
      
(132
)
    
(132
)
Income (loss) before income taxes
    
5,116
      
(1,564
)
    
(7,445
)
    
(3,893
)
    
1,294
      
1,713
      
(8,004
)
    
(4,997
)
Income tax recovery (expense)
    
(219
)
    
646
      
-
      
427
      
(210
)
    
-
      
-
      
(210
)
Net income (loss) for the year
  
$
4,897
    
$
(918
)
  
$
(7,445
)
  
$
(3,466
)
  
$
1,084
    
$
1,713
    
$
(8,004
)
  
$
(5,207
)