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Mineral Property, Pland and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Amortization rates applicable to each category of property, plant and equipment, with the exception of land, are as follows:


Asset			Useful life
Leasehold improvements			Lease term
Mobile equipment			2-10 years
Other equipment			2-20 years
Processing plant			Unit-of-production
Shaft, underground infrastructure and mineral properties			Unit-of-production
Vehicles			3-7 years
Buildings			7-20 years
Office equipment			2-8 years


		Mineral property
	Plant and equipment	Depletable	Non-depletable	Exploration and evaluation	Total
Cost
At December 31, 2019	$1,320.3	$2,316.5	$239.2	$262.0	$4,138.0
Additions	94.1	95.0	39.7	14.2	243.0
Acquisition of Trillium Mining Corp. (ii)	—	—	—	19.3	19.3
Repurchase of Island Gold royalty (i)	—	54.8	—	—	54.8
Revisions to decommissioning liabilities	—	17.1	—	—	17.1

Disposals	(5.6)	—	—	—	(5.6)
Transfers	121.2	—	(121.2)	—	—
At December 31, 2020	$1,530.0	$2,483.4	$157.7	$295.5	$4,466.6
Additions	105.3	113.7	116.5	23.8	359.3

Repurchase of Island Gold royalty (i)	—	15.7	—	—	15.7
Revisions to decommissioning liabilities (note 10)	—	18.4	11.4	—	29.8
Disposals	(6.0)	—	—	—	(6.0)

At December 31, 2021	$1,629.3	$2,631.2	$285.6	$319.3	$4,865.4

Accumulated amortization and impairment charges
At December 31, 2019	$569.4	$626.4	$—	$8.8	$1,204.6
Amortization	76.5	88.8	—	—	165.3

Disposals	(4.6)	—	—	—	(4.6)
At December 31, 2020	$641.3	$715.2	$—	$8.8	$1,365.3
Amortization	80.7	96.6	—	—	177.3
Disposals	(4.5)	—	—	—	(4.5)
Impairment charge (note 13)	0.3	—	142.4	76.1	218.8


At December 31, 2021	$717.8	$811.8	$142.4	$84.9	$1,756.9

Net carrying value
At December 31, 2020	$888.7	$1,768.2	$157.7	$286.7	$3,101.3
At December 31, 2021	$911.5	$1,819.4	$143.2	$234.4	$3,108.5

The net carrying values by segment (note 16) are as follows: