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Property, plant and equipment
 12 Months Ended
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [abstract]  
Property, plant and equipment [Text Block]

11. Property, plant and equipment

Dec. 31, 2021   Exploration and evaluation assets     Capital works in progress     Mining properties     Plant and equipment     Plant and equipment- ROU assets1     Total  
Balance, Jan. 1, 2021 $ 79,059   $ 957,162   $ 2,217,461   $ 2,793,719   $ 214,303   $ 6,261,704  
Additions   9,084     268,090     1,731     17,735     49,695     346,335  
Capitalized stripping and development   -     -     79,426     -     -     79,426  
Decommissioning and restoration   -     (525 )   4,630     139,911     -     144,016  
Transfers and other movements   -     (357,381 )   128,320     229,981     (920 )   -  
Disposals   -     (5,941 )   -     (10,803 )   (3,544 )   (20,288 )
Impairment   -     -     (1,054 )   (192,419 )   -     (193,473 )
Effects of movements in exchange rates   64     (3,175 )   3,486     5,795     192     6,362  
Balance, Dec. 31, 2021   88,207     858,230     2,434,000     2,983,919     259,726     6,624,082  
                                     
Accumulated depreciation                                    
Balance, Jan. 1, 2021   -     -     1,126,274     1,271,581     132,194     2,530,049  
Depreciation for the year   -     -     155,878     181,565     24,536     361,979  
Disposals   -     -     -     (8,525 )   (3,158 )   (11,683 )
Effects of movement in exchange rates   -     -     2,217     501     53     2,771  
Balance, Dec. 31, 2021   -     -     1,284,369     1,445,122     153,625     2,883,116  
Net book value $ 88,207   $ 858,230   $ 1,149,631   $ 1,538,797   $ 106,101   $ 3,740,966  

1 Includes $5,112 of capital works in progress - ROU assets (costs) that relate to the Arizona business unit (December 31, 2020 - $4,777, related to the Arizona and Manitoba business unit).

Dec. 31, 2020   Exploration and evaluation assets     Capital works in progress     Mining properties     Plant and equipment     Plant and equipment- ROU assets1     Total  
Balance, January 1, 2020 $ 69,903   $ 733,874   $ 2,146,583   $ 2,653,752   $ 201,972   $ 5,806,084  
Additions   809     256,251     311     28,523     17,759     303,653  
Capitalized stripping and development   -     -     83,137     -     -     83,137  
Decommissioning and restoration   -     263     6,849     39,680     -     46,792  
Transfers and other movements   8,040     (36,668 )   (41,256 )   70,777     (893 )   -  
Disposals   -     -     -     (19,681 )   (5,884 )   (25,565 )
Effects of movements in exchange rates   307     3,442     21,837     20,668     1,349     47,603  
Balance, Dec. 31, 2020   79,059     957,162     2,217,461     2,793,719     214,303     6,261,704  
                                     
Accumulated depreciation                                    
Balance, January 1, 2020   -     -     963,530     1,069,687     110,308     2,143,525  
Depreciation for the year   -     -     146,113     200,632     23,351     370,096  
Disposals   -     -     -     (14,038 )   (2,475 )   (16,513 )
Effects of movement in exchange rates   -     -     16,631     15,300     1,010     32,941  
Balance, Dec. 31, 2020   -     -     1,126,274     1,271,581     132,194     2,530,049  
Net book value $ 79,059   $ 957,162   $ 1,091,187   $ 1,522,138   $ 82,109   $ 3,731,655  

During the third quarter of 2021, an impairment indicator was identified in relation to a revised Flin Flon closure plan. The revised closure plan, reflecting higher cost estimates, led to a large increase in the environmental obligation (note 18) and a corresponding increase to Flin Flon PP&E. The increase in Flin Flon PP&E prompted an impairment test of these assets since the Flin Flon operation is expected to close mid-2022. Hudbay recorded an impairment to PP&E by comparing the carrying value of the Flin Flon operation to its recoverable amount using the value-in-use method for future cash flows associated with the operation until closure. The value-in-use recoverable amount is considered a level 3 valuation method. This resulted in an impairment loss of $147,305.

During the fourth quarter, as a result of declines in risk-free discount rates and with the Flin Flon operation being near closure, the same recoverability of assets test was performed. This resulted in an impairment loss of $46,168. Given the closure is expected to occur in less than 12 months, the impairment was charged to the consolidated income statements. For more information see note 5h.

Given the closure is expected to occur in less than 12 months, future adjustments to the Flin Flon environmental provision from fair value adjustments, or otherwise, may lead to future impairment tests of the Flin Flon operation and any resulting impairments or impairment reversals will be charged to the consolidated income statements.

Effective January 1, 2021, following a new NI 43-101 technical report for Peru, the Company made a change in estimate for the depreciation calculation of certain mineral property PP&E assets in Peru to utilize contained metal. This better reflects the systematic allocation of costs to inventory given the change in grade profile following the recently published NI 43-101. Since the change is in response to an updated life-of-mine plan, it is being treated in accordance with a change in estimate and will be applied prospectively. For the year ended December 31, 2021, depreciation expense is higher by $4,835 compared to the result under the previous depreciation calculation.