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v3.19.3.a.u2

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of significant accounting policies [Abstract] |  |
Schedule of Subsidiaries |  | 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
Disclosure of detailed information about property, plant and equipment | Amortization rates applicable to each category of property, plant and equipment, with the exception of land, are as follows:
Asset | Useful life
Leasehold improvements | 3 years
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
| Amortization rates applicable to each category of property, plant and equipment, with the exception of land, are as follows:
Asset | Useful life
Leasehold improvements | 3 years
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, 2017 | $1,103.0 |  | $2,118.3 |  | $80.5 |  | $326.9 |  | $3,628.7 |
Additions | 105.9 |  | 90.7 |  | 15.3 |  | 14.6 |  | 226.5 |
Transfer (i) | — |  | 90.7 |  | — |  | (90.7 | ) | — |
Disposals | (8.8 | ) | — |  | — |  | — |  | (8.8 | )
At December 31, 2018 | $1,200.1 |  | $2,299.7 |  | $95.8 |  | $250.8 |  | $3,846.4 |
Additions | 126.9 |  | 130.2 |  | 9.1 |  | 11.6 |  | 277.8 |
Revisions to decommissioning liabilities | — |  | 13.3 |  | — |  | — |  | 13.3 |
Right-of-use assets (note 16) | 2.4 |  | — |  | — |  | — |  | 2.4 |
Disposals | (1.9 | ) | — |  | — |  | — |  | (1.9 | )
At December 31, 2019 | $1,327.5 |  | $2,443.2 |  | $104.9 |  | $262.4 |  | $4,138.0 |
Accumulated amortization and impairment charges |  |  |
At December 31, 2017 | $333.9 |  | $530.0 |  | $5.1 |  | $6.3 |  | $875.3 |
Amortization | 72.4 |  | 88.1 |  | — |  | — |  | 160.5 |
Disposals | (2.7 | ) | — |  | — |  | — |  | (2.7 | )
At December 31, 2018 | $403.6 |  | $618.1 |  | $5.1 |  | $6.3 |  | $1,033.1 |
Amortization | 68.3 |  | 104.4 |  | — |  | — |  | 172.7 |
Disposals | (1.2 | ) | — |  | — |  | — |  | (1.2 | )
At December 31, 2019 | $470.7 |  | $722.5 |  | $5.1 |  | $6.3 |  | $1,204.6 |
Net carrying value |  |  |  |  |
At December 31, 2018 | $796.5 |  | $1,681.6 |  | $90.7 |  | $244.5 |  | $2,813.3 |
At December 31, 2019 | $856.8 |  | $1,720.7 |  | $99.8 |  | $256.1 |  | $2,933.4 |
The net carrying values by segment (note 14) are as follows:
|  | Mineral property |  |
| Plant and equipment | Depletable | Non-depletable | Exploration and evaluation | Total
Young-Davidson | $658.0 |  | $709.6 |  | $99.8 |  | — |  | $1,467.4 |
Mulatos | 82.6 |  | 161.4 |  | — |  | — |  | 244.0 |
Island Gold | 108.9 |  | 715.4 |  | — |  | — |  | 824.3 |
El Chanate | 0.2 |  | — |  | — |  | — |  | 0.2 |
Kirazlı | 0.3 |  | 134.3 |  | — |  | — |  | 134.6 |
Corporate and other | 6.8 |  | — |  | — |  | 256.1 |  | 262.9 |
At December 31, 2019 | $856.8 |  | $1,720.7 |  | $99.8 |  | $256.1 |  | $2,933.4 |
Young-Davidson | $608.9 |  | $744.7 |  | $90.7 |  | — |  | $1,444.3 |
Mulatos | 101.0 |  | 108.4 |  | — |  | — |  | 209.4 |
Island Gold | 79.5 |  | 720.6 |  | — |  | — |  | 800.1 |
El Chanate | 1.5 |  | 0.8 |  | — |  | — |  | 2.3 |
Kirazlı | 0.3 |  | 107.1 |  | — |  | — |  | 107.4 |
Corporate and other | 5.3 |  | — |  | — |  | 244.5 |  | 249.8 |
At December 31, 2018 | $796.5 |  | $1,681.6 |  | $90.7 |  | $244.5 |  | $2,813.3 |
Schedule of Investments By Classification |  |
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
Schedule of Recently Issued Standards, Not Yet Adopted |  | Standards issued, but not yet adopted include:

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