MINERAL PROPERTIES, PLANT AND EQUIPMENT - Disclosure of detailed information about property, plant and equipment (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
$ 87,955
|
|
| Impairments, net |
(16,791)
|
$ 424
|
| Mineral properties, plant and equipment at end of period |
122,197
|
87,955
|
| Carrying amount [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
766,417
|
740,999
|
| Additions |
62,270
|
30,090
|
| Disposals |
(106,473)
|
(4,672)
|
| Mineral properties, plant and equipment at end of period |
722,214
|
766,417
|
| Accumulated amortization and impairment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
(678,462)
|
(652,666)
|
| Amortization |
25,508
|
29,211
|
| Impairments, net |
|
424
|
| Disposals |
(103,953)
|
(3,839)
|
| Mineral properties, plant and equipment at end of period |
(600,017)
|
(678,462)
|
| Mineral properties [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
42,543
|
|
| Mineral properties, plant and equipment at end of period |
66,630
|
42,543
|
| Mineral properties [Member] | Carrying amount [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
552,878
|
534,222
|
| Additions |
40,261
|
18,656
|
| Disposals |
(81,740)
|
0
|
| Mineral properties, plant and equipment at end of period |
511,399
|
552,878
|
| Mineral properties [Member] | Accumulated amortization and impairment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
(510,335)
|
(489,763)
|
| Amortization |
15,614
|
18,676
|
| Impairments, net |
|
1,896
|
| Disposals |
(81,180)
|
0
|
| Mineral properties, plant and equipment at end of period |
(444,769)
|
(510,335)
|
| Plant [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
11,630
|
|
| Mineral properties, plant and equipment at end of period |
9,977
|
11,630
|
| Plant [Member] | Carrying amount [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
106,445
|
104,010
|
| Additions |
2,838
|
2,506
|
| Disposals |
(11,098)
|
(71)
|
| Mineral properties, plant and equipment at end of period |
98,185
|
106,445
|
| Plant [Member] | Accumulated amortization and impairment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
(94,815)
|
(92,196)
|
| Amortization |
3,393
|
4,472
|
| Impairments, net |
|
(1,782)
|
| Disposals |
(10,000)
|
(71)
|
| Mineral properties, plant and equipment at end of period |
(88,208)
|
(94,815)
|
| Machinery & equipment and assets under finance lease [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
27,881
|
|
| Mineral properties, plant and equipment at end of period |
37,695
|
27,881
|
| Machinery & equipment and assets under finance lease [Member] | Carrying amount [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
81,003
|
76,476
|
| Additions |
15,435
|
7,762
|
| Disposals |
(9,298)
|
(3,235)
|
| Mineral properties, plant and equipment at end of period |
87,140
|
81,003
|
| Machinery & equipment and assets under finance lease [Member] | Accumulated amortization and impairment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
(53,122)
|
(50,765)
|
| Amortization |
4,947
|
4,471
|
| Impairments, net |
|
310
|
| Disposals |
(8,624)
|
(2,424)
|
| Mineral properties, plant and equipment at end of period |
(49,445)
|
(53,122)
|
| Building [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
3,148
|
|
| Mineral properties, plant and equipment at end of period |
4,251
|
3,148
|
| Building [Member] | Carrying amount [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
13,314
|
12,956
|
| Additions |
1,623
|
358
|
| Disposals |
(1,492)
|
0
|
| Mineral properties, plant and equipment at end of period |
13,445
|
13,314
|
| Building [Member] | Accumulated amortization and impairment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
(10,166)
|
(9,860)
|
| Amortization |
352
|
306
|
| Impairments, net |
|
0
|
| Disposals |
(1,324)
|
0
|
| Mineral properties, plant and equipment at end of period |
(9,194)
|
(10,166)
|
| Transport & office equipment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
2,753
|
|
| Mineral properties, plant and equipment at end of period |
3,644
|
2,753
|
| Transport & office equipment [Member] | Carrying amount [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
12,777
|
13,335
|
| Additions |
2,113
|
808
|
| Disposals |
(2,845)
|
(1,366)
|
| Mineral properties, plant and equipment at end of period |
12,045
|
12,777
|
| Transport & office equipment [Member] | Accumulated amortization and impairment [Member] |
|
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
|
| Mineral properties, plant and equipment at beginning of period |
(10,024)
|
(10,082)
|
| Amortization |
1,202
|
1,286
|
| Disposals |
(2,825)
|
(1,344)
|
| Mineral properties, plant and equipment at end of period |
$ (8,401)
|
$ (10,024)
|