Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

These consolidated financial statements include the accounts of the Company and the following subsidiaries:


Company	Principal activity	Country of incorporation
AuRico Gold Chihuahua, S.A. de C.V., SOFOM E.N.R.	Administrative services	Mexico
AuRico Gold Holdings Inc.	Holding company	Canada
AuRico Gold (USA), Inc.	Administrative services	United States of America
Capital Gold Corporation	Holding company	United States of America
Leadville Mining & Milling Holding Corporation	Holding company	United States of America
Minera Santa Rita, S. de R.L. de C.V.	Gold and silver mining	Mexico
Nayarit Gold Inc.	Holding company	Canada
Oro de Altar, S.A. de C.V.	Holding company	Mexico
0975828 B.C. LTD.	Holding company	Canada
Orsa Ventures Corp.	Holding company	Canada
Minas de Oro Nacional, S.A. de C.V.	Gold and silver mining	Mexico
Operason S.A. de C.V.	Administrative services	Mexico
Sonora Gerencial S.A. de C.V.	Administrative services	Mexico
Esperanza Silver de Mexico SA de CV	Gold and silver mining	Mexico
Servicios Mineros Tetlama S.A. de C.V.	Administrative services	Mexico
Esperanza Silver Peru SAC	Gold and silver mining	Peru
Dogu Biga Madencilik Sanayi Ticaret AS	Gold and silver mining	Turkey
Quartz Mountain Gold Ltd.	Gold and silver mining	United States of America
Carlisle Goldfields Ltd.	Holding company	Canada
Patricia Mining Corp.	Holding company	Canada
Alamos Gold Holdings Inc.	Holding company	Canada
Alamos Gold Holdings Coöperatief U.A.	Holding company	Netherlands
Alamos Gold Holdings B.V.	Holding company	Netherlands
Host's Gold Incorporated	Holding company	Canada
Trillium Mining Corp.	Holding company	Canada
2663200 Ontario Inc.	Holding company	Canada

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, 2018	$1,194.6	$2,305.6	$95.8	$250.4	$3,846.4
Additions	125.2	131.9	9.1	11.6	277.8
Revisions to decommissioning liabilities	—	13.3	—	—	13.3
Right-of-use assets	2.4	—	—	—	2.4
Disposals	(1.9)	—	—	—	(1.9)
At December 31, 2019	$1,320.3	$2,450.8	$104.9	$262.0	$4,138.0
Additions	94.1	101.5	33.2	14.2	243.0
Acquisition of Trillium Mining Corp. (i)	—	—	—	19.3	19.3
Repurchase of Island Gold royalty (ii)	—	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	$2,624.2	$16.9	$295.5	$4,466.6

Accumulated amortization and impairment charges
At December 31, 2018	$502.9	$521.4	$—	$8.8	$1,033.1
Amortization	66.6	105.0	—	—	171.6
Amortization (right-of-use assets)	1.1	—	—	—	1.1
Disposals	(1.2)	—	—	—	(1.2)
At December 31, 2019	$569.4	$626.4	$—	$8.8	$1,204.6
Amortization	75.5	88.8	—	—	164.3
Amortization (right-of-use assets)	1.0	—	—	—	1.0
Disposals	(4.6)	—	—	—	(4.6)

At December 31, 2020	$641.3	$715.2	$—	$8.8	$1,365.3

Net carrying value
At December 31, 2019	$750.9	$1,824.4	$104.9	$253.2	$2,933.4
At December 31, 2020	$888.7	$1,909.0	$16.9	$286.7	$3,101.3

Note: Certain comparative balances have been restated to conform presentation adopted during the year.

The net carrying values by segment (note 14) are as follows:


Asset / Liability
Cash and cash equivalents						Amortized cost
Equity securities						Fair value through OCI
Amounts receivable						Amortized cost
Accounts payable and accrued liabilities						Amortized cost
Debt and financing obligations						Amortized cost
Non-hedged derivatives						Fair value through profit or loss
Hedging derivatives						Fair value through OCI

Standards issued, but not yet adopted include: