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Property, Plant, Equipment and Mineral Interests
 3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
6.
Property, Plant, Equipment and Mineral Interests
 
Property, plant and equipment and mineral interests, are depreciated and depleted using either the units-of-production or straight-line method over the shorter of the estimated useful life of the asset or the expected life of mine. Assets under construction in progress are recorded at cost and re-allocated to its corresponding category when they become available for use.
 
 
 
Land
 
 
Mineral

property

interest and

claims
 
 
Mine

development
 
 
Machinery

and

equipment
 
 
Buildings and

infrastructure
 
 
Construction

in progress
 
 
Interest

capitalized
 
 
Total
 
Cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
$
3,969
 
 
$
5,280
 
 
$
50,773
 
 
$
70,066
 
 
$
28,397
 
 
$
54
 
 
$
5,886
 
 
$
164,425
 
Additions
 
 
173
 
 
 
5
 
 
 
492
 
 
 
-
 
 
 
-
 
 
 
6,902
 
 
 
-
 
 
 
7,572
 
Transfers
 
 
(5
)
 
 
550
 
 
 
711
 
 
 
5,375
 
 
 
48
 
 
 
(6,679
)
 
 
-
 
 
 
-
 
Disposals
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(213
)
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(213
)
At December 31, 2018
 
$
4,137
 
 
$
5,835
 
 
$
51,976
 
 
$
75,228
 
 
$
28,445
 
 
$
277
 
 
$
5,886
 
 
$
171,784
 
Additions
 
 
132
 
 
 
-
 
 
 
416
 
 
 
89
 
 
 
-
 
 
 
1,862
 
 
 
-
 
 
 
2,499
 
Disposals
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(50
)
 
 
-
 
 
 
-
 
 
 
(50
)
At March 31, 2019
 
$
4,269
 
 
$
5,835
 
 
$
52,392
 
 
$
75,317
 
 
$
28,395
 
 
$
2,139
 
 
$
5,886
 
 
$
174,233
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated depreciation and depletion
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 
$
-
 
 
$
328
 
 
$
3,415
 
 
$
13,353
 
 
$
5,010
 
 
$
-
 
 
$
471
 
 
$
22,577
 
Additions
 
 
-
 
 
 
278
 
 
 
2,682
 
 
 
7,789
 
 
 
2,357
 
 
 
-
 
 
 
430
 
 
 
13,536
 
Disposals
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(147
)
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(147
)
At December 31, 2018
 
$
-
 
 
$
606
 
 
$
6,097
 
 
$
20,995
 
 
$
7,367
 
 
$
-
 
 
$
901
 
 
$
35,966
 
Additions
 
 
-
 
 
 
55
 
 
 
772
 
 
 
1,981
 
 
 
582
 
 
 
-
 
 
 
108
 
 
 
3,498
 
At March 31, 2019
 
$
-
 
 
$
661
 
 
$
6,869
 
 
$
22,976
 
 
$
7,949
 
 
$
-
 
 
$
1,009
 
 
$
39,464
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Carrying values
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2018
 
$
4,137
 
 
$
5,229
 
 
$
45,879
 
 
$
54,233
 
 
$
21,078
 
 
$
277
 
 
$
4,985
 
 
$
135,818
 
At March 31, 2019
 
$
4,269
 
 
$
5,174
 
 
$
45,523
 
 
$
52,341
 
 
$
20,446
 
 
$
2,139
 
 
$
4,877
 
 
$
134,769