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PROPERTY, PLANT AND EQUIPMENT (Tables)
 9 Months Ended
Sep. 30, 2017
Property, plant and equipment [abstract]  
Disclosure of property, plant and equipment
 
Construction
in progress
Mining
properties
Plant and
equipment
Total
Cost
 
 
 
 
Balance, January 1, 2016
$
7.9

$
2,133.6

$
1,821.3

$
3,962.8

Additions
34.9

172.1

87.3

294.3

Changes in asset retirement obligations
—

11.7

—

11.7

Disposals
—

—

(42.6
)
(42.6
)
Transfers within Property, plant and equipment
(40.0
)
19.1

20.9

—

Balance, December 31, 2016
2.8

2,336.5

1,886.9

4,226.2

Additions
15.3

99.5

57.3

172.1

Changes in asset retirement obligations
—

(1.0
)
—

(1.0
)
Disposals
—

(0.2
)
(25.1
)
(25.3
)
Transfers within Property, plant and equipment
(12.7
)
12.9

(0.2
)
—

Transfers to Exploration and evaluation assets
—

—

(0.5
)
(0.5
)
Balance, September 30, 2017
$
5.4

$
2,447.7

$
1,918.4

$
4,371.5

 
Construction
in progress
Mining
properties
Plant and
equipment
Total
Accumulated Depreciation and Impairment
 
 
 
 
Balance, January 1, 2016
$
3.5

$
1,383.0

$
722.5

$
2,109.0

Depreciation expense1
—

98.5

187.5

286.0

Disposals
—

—

(37.0
)
(37.0
)
Transfers within Property, plant and equipment
(3.5
)
—

3.5

—

Balance, December 31, 2016
—

1,481.5

876.5

2,358.0

Depreciation expense1
—

79.8

132.6

212.4

Disposals
—

—

(22.8
)
(22.8
)
Reversal of impairment charges2
—

(124.1
)
—

(124.1
)
Balance, September 30, 2017
$
—

$
1,437.2

$
986.3

$
2,423.5

Carrying amount, December 31, 2016
$
2.8

$
855.0

$
1,010.4

$
1,868.2

Carrying amount, September 30, 2017
$
5.4

$
1,010.5

$
932.1

$
1,948.0

1
Excludes depreciation expense related to Corporate assets, which is included in General and administrative expenses.
2
Note 27.
 
Notes
September 30,
2017
December 31,
2016
Balance, beginning of the period
 
$
169.2

$
155.1

Exploration and evaluation expenditures
 
8.4

14.1

Acquired Merrex exploration and evaluation assets
4
36.6

—

Reversal of impairment charge
5, 27
400.0

—

Sale of a 30% interest in the Côté Gold Project
5
(167.3
)
—

Balance, end of the period
 
$
446.9

$
169.2