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Mineral Property, Pland and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
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
2-20 years
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, 2016
$983.6

$1,343.0

$66.2

$285.3

$2,678.1

Additions
66.4

56.7

14.3

41.6

179.0

Acquisition of Richmont Mines (note 5)
55.7

718.6

—

—

774.3

Disposals
(2.7
)
—

—

—

(2.7
)
At December 31, 2017
$1,103.0

$2,118.3

$80.5

$326.9

$3,628.7

Additions
123.4

73.4

15.3

14.4

226.5

Transfer (i)
—

98.6

—

(98.6
)
—

Disposals
(8.8
)
—

—

—

(8.8
)
At December 31, 2018
$1,217.6

$2,290.3

$95.8

$242.7

$3,846.4

 
 
 
 
 
 
Accumulated amortization and impairment charges
 
 
 
At December 31, 2016
$273.4

$475.1

$5.1

$6.3

$759.9

Amortization
61.6

54.9

—

—

116.5

Disposals
(1.1
)
—

—

—

(1.1
)
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

 
 
 
 
 
 
Net carrying value
 
 
 
 
 
At December 31, 2017
$769.1

$1,588.3

$75.4

$320.6

$2,753.4

At December 31, 2018
$814.0

$1,672.2

$90.7

$236.4

$2,813.3

The net carrying values by segment (note 15) are as follows:
 
 
Mineral property
 
 
 
Plant and equipment
Depletable
Non-depletable
Exploration and evaluation
Total
Young-Davidson
$608.9

$744.7

$90.7

—

$1,444.3

Mulatos
115.6

95.8

—

—

211.4

Island Gold
79.5

720.6

—

—

800.1

El Chanate
1.5

0.8

—

—

2.3

Kirazlı (i)
3.2

110.3

—

—

113.5

Corporate and other
5.3

—

—

236.4

241.7

At December 31, 2018
$814.0

$1,672.2

$90.7

$236.4

$2,813.3

 
 
 
 
 
 
Young-Davidson
$589.5

$767.1

$75.4

—

$1,432.0

Mulatos
112.9

99.1

—

—

212.0

Island Gold
54.8

720.1

—

—

774.9

El Chanate
4.1

2.0

—

—

6.1

Corporate and other
7.8

—

—

320.6

328.4

At December 31, 2017
$769.1

$1,588.3

$75.4

$320.6

$2,753.4