| Property, plant and equipment |
7. Property, plant and equipment | | | | | | | | | | | | | | Corporate | | | | | | | Mining | | | Non-producing | | | Plant and | | | Right-of-use | | | office | | | | | | | interests | | | properties | | | equipment | | | lease assets | | | equipment | | | Total | | | | | | | | | | | | | | | | | | | | | Cost | | | | | | | | | | | | | | | | | | | Balance at January 1, 2024 | | $ | 226,819 | | | $ | 12,469 | | | $ | 128,228 | | | $ | 11,685 | | | $ | 237 | | | $ | 379,438 | | Asset additions | | | 14,226 | | | | - | | | | 4,794 | | | | 789 | | | | - | | | | 19,809 | | Change in decommissioning provision | | | (1,420 | ) | | | - | | | | - | | | | - | | | | - | | | | (1,420 | ) | Balance at December 31, 2024 | | | 239,625 | | | | 12,469 | | | | 133,022 | | | | 12,474 | | | | 237 | | | | 397,827 | | Asset additions | | | 20,701 | | | | - | | | | 8,137 | | | | 2,084 | | | | 190 | | | | 31,112 | | Asset disposals | | | - | | | | - | | | | - | | | | (31 | ) | | | - | | | | (31 | ) | Change in decommissioning provision | | | 614 | | | | - | | | | - | | | | - | | | | - | | | | 614 | | Balance at September 30, 2025 | | $ | 260,940 | | | $ | 12,469 | | | $ | 141,159 | | | $ | 14,527 | | | $ | 427 | | | $ | 429,522 | | | | | | | | | | | | | | | | | | | | | | | | | | | Accumulated depreciation and depletion | | | | | | | | | | | | | | | | | | | | | | | | | Balance at January 1, 2024 | | $ | (132,474 | ) | | $ | - | | | $ | (85,440 | ) | | $ | (8,223 | ) | | $ | (200 | ) | | $ | (226,337 | ) | Depreciation/depletion for the year | | | (14,172 | ) | | | - | | | | (8,615 | ) | | | (1,278 | ) | | | (26 | ) | | | (24,091 | ) | Balance at December 31, 2024 | | | (146,646 | ) | | | - | | | | (94,055 | ) | | | (9,501 | ) | | | (226 | ) | | | (250,428 | ) | Depreciation/depletion for the period | | | (8,347 | ) | | | - | | | | (5,830 | ) | | | (1,522 | ) | | | (11 | ) | | | (15,710 | ) | Balance at September 30, 2025 | | $ | (154,993 | ) | | $ | - | | | $ | (99,885 | ) | | $ | (11,023 | ) | | $ | (237 | ) | | $ | (266,138 | ) | | | | | | | | | | | | | | | | | | | | | | | | | | Carrying value | | | | | | | | | | | | | | | | | | | | | | | | | at December 31, 2024 | | $ | 92,979 | | | $ | 12,469 | | | $ | 38,967 | | | $ | 2,973 | | | $ | 11 | | | $ | 147,399 | | at September 30, 2025 | | $ | 105,947 | | | $ | 12,469 | | | $ | 41,274 | | | $ | 3,504 | | | $ | 190 | | | $ | 163,384 | |
Non-current assets are tested for impairment or impairment reversals when events or changes in circumstances suggest that the carrying amount may not be recoverable. No impairment or impairment reversal were identified for the nine-month period ended September 30, 2025 for each of the Company’s cash-generating unit, including non-producing properties and properties placed under care and maintenance. The carrying amounts of mineral interests, plant and equipment, and right-of-use lease assets from the Relief Canyon Mine is approximately $16.0 million, $5.1 million, and $0.1 million, respectively, as at September 30, 2025 (December 31, 2024: $16.0 million, $7.0 million, and $0.7 million, respectively). The Company completed the acquisition of the San Felipe property located in Sonora, Mexico on October 8, 2020. As at September 30, 2025, the carrying amount of this property was $12.5 million included in non-producing properties. |