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Mineral Property, Pland and Equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]    
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