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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]  
Summary of Property, Plant and Equipment
 
Land and buildings

Plant and equipment

Capital works in progress

Mineral properties

Capitalized Evaluation

Total

Cost
 
 
 
 
 
 
Balance at January 1, 2018
$
185,923

$
1,531,640

$
56,821

$
4,485,599

$
87,031

$
6,347,014

Additions/transfers
6,203

119,712

1,646

193,550

6,202

327,313

Proceeds on pre-commercial production sales, net
—

(2,906
)
—

(3,566
)
—

(6,472
)
Commercial production transfers (1)
387

458,976

53,858

(506,206
)
—

7,015

Other movements/transfers
(240
)
13,011

1,769

(200
)
226

14,566

Disposals
(29
)
(8,400
)
—

(20
)
—

(8,449
)
Balance at December 31, 2018
$
192,244

$
2,112,033

$
114,094

$
4,169,157

$
93,459

$
6,680,987

 
 
 
 
 
 
 
Additions/transfers
$
17,379

$
85,929

$
19,735

$
68,794

$
3,393

$
195,230

IFRS 16 transition adjustment
7,555

1,734

90

—

—

9,379

Proceeds on pre-commercial production sales, net
—

—

—

(12,159
)
—

(12,159
)
Commercial production transfers (2)
27,070

92,791

—

(119,861
)
—

—

(Impairment) reversal (note 32)
—

11,690

(15,268
)
—

—

(3,578
)
Write-down of assets
—

(1,979
)
—

—

(16
)
(1,995
)
Other movements/transfers
(1,715
)
33,335

(30,103
)
(505
)
(129
)
883

Transfer to assets held for sale
—

(11,690
)
—

—

—

(11,690
)
Disposals
(22
)
(4,455
)
(737
)
(2,421
)
—

(7,635
)
Balance at December 31, 2019
$
242,511

$
2,319,388

$
87,811

$
4,103,005

$
96,707

$
6,849,422

 
 
 
 
 
 
 
Accumulated depreciation
 
 
 
 
 
 
Balance at January 1, 2018
$
(43,426
)
$
(786,050
)
$
(4,733
)
$
(1,285,408
)
$
—

$
(2,119,617
)
Depreciation for the year
(3,125
)
(88,649
)
—

(3,774
)
—

(95,548
)
Commercial production transfers (1)
—

(13,288
)
—

—

—

(13,288
)
Other movements
(1,060
)
(15,485
)
—

(346
)
—

(16,891
)
Impairment
(363
)
(105,932
)
—

(341,513
)
—

(447,808
)
Disposals
—

641

—

—

—

641

Balance at December 31, 2018
$
(47,974
)
$
(1,008,763
)
$
(4,733
)
$
(1,631,041
)
$
—

$
(2,692,511
)
 
 
 
 
 
 
 
Depreciation for the year
$
(10,605
)
$
(107,654
)
$
—

$
(51,965
)
$
—

$
(170,224
)
Impairment reversal
—

90,825

—

9,667

—

100,492

Other movements
(206
)
(1,049
)
—

213

—

(1,042
)
Disposals
7

2,058

—

—

—

2,065

Balance at December 31, 2019
$
(58,778
)
$
(1,024,583
)
$
(4,733
)
$
(1,673,126
)
$
—

$
(2,761,220
)
 
 
 
 
 
 
 
Carrying amounts
 
 
 
 
 
 
At January 1, 2018
$
142,497

$
745,590

$
52,088

$
3,200,191

$
87,031

$
4,227,397

At December 31, 2018
144,270

1,103,270

109,361

2,538,116

93,459

3,988,476

Balance at December 31, 2019
$
183,733

$
1,294,805

$
83,078

$
2,429,879

$
96,707

$
4,088,202
Summary of Key Assumptions Used for Assessing Recoverable Amount of Company's CGUs Versus Carrying Values
 
2019

2018

Gold price ($/oz)

$1,400

$1,275 - 1,300

Silver price ($/oz)

$18

$17 - 18

Lead price ($/t)

$2,100

$2,200 - 2,300

Zinc price ($/t)

$2,400

$2,800 - 2,900

Discount rate
6.0
%
7.0
%
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations
27
%
27
%
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves
$130
$100
 
2019

2018

Gold price ($/oz)

$1,400


$1,250

Silver price ($/oz)

$18


$17

Discount rate
5.0
%
6.5
%
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations
69
%
32
%
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves

$110


$50