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Mining interests (Tables)
 12 Months Ended
Dec. 31, 2019
Exploration And Evaluation Of Mineral Resources [Abstract]  
Disclosure of detailed information about property, plant and equipment
 
 
2019

 
2018

 
 
$

 
$

Property, plant and equipment (depletable)
 
 
 
 
Fekola Mine, Mali
 
 
 
 
Cost
 
1,322,865

 
1,168,491

Accumulated depreciation and depletion
 
(258,580
)
 
(144,335
)
 
 
1,064,285

 
1,024,156

Masbate Mine, Philippines
 
 
 
 
Cost, net of impairment
 
815,418

 
681,509

Accumulated depreciation and depletion
 
(295,616
)
 
(248,021
)
 
 
519,802

 
433,488

Otjikoto Mine, Namibia
 
 
 
 
Cost
 
638,664

 
575,127

Accumulated depreciation and depletion
 
(323,152
)
 
(238,579
)
 
 
315,512

 
336,548

Limon Mine, Nicaragua
 
 
 
 
Cost
 
—

 
217,263

Accumulated depreciation and depletion
 
—

 
(149,541
)
 
 
—

 
67,722

Libertad Mine, Nicaragua
 
 
 
 
Cost, net of impairment
 
—

 
315,569

Accumulated depreciation and depletion
 
—

 
(295,715
)
 
 
—

 
19,854

 
 
 
 
 
Exploration and evaluation properties (non-depletable)
 
 
 
 
Kiaka, Burkina Faso
 
76,807

 
73,173

Anaconda Regional, Mali
 
27,139

 
21,903

Toega, Burkina Faso
 
—

 
19,581

Mocoa Royalty, Colombia
 
10,230

 
10,230

Ondundu, Namibia
 
9,778

 
8,273

Finland Properties, Finland
 
6,697

 
5,947

Other
 
14,321

 
13,542

 
 
144,972

 
152,649

Corporate & other
 
 
 
 
Office, furniture and equipment, net
 
2,160

 
680

 
 
2,046,731

 
2,035,097

Investments in joint ventures and associates (accounted for using the equity method)
 
 
 
 
Gramalote, Colombia, net of impairment
 
77,265

 
72,078

Calibre, Nicaragua (Note 6)
 
53,471

 
—

 
 
130,736

 
72,078

 
 
2,177,467

 
2,107,175

 
Cost
 
Accumulated depreciation
 
Net carrying value
 
Balance at Dec. 31, 2018

Additions

Disposals / 
write-offs

Reclass / Impairment reversal

Balance at Dec. 31, 2019

 
Balance at Dec. 31, 2018

Depreciation

Disposals / 
write-offs

Balance at Dec. 31, 2019

 
As at Dec. 31, 2019

As at Dec. 31, 2018

 
$
$
$
$
$
 
$
$
$
$
 
$
$
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Property, plant and equipment (depletable)
 
 
 
 
 
 
 
 
 
 
 
 
 
Fekola
1,168,491

156,894

(2,520
)
—

1,322,865

 
(144,335
)
(115,676
)
1,431

(258,580
)
 
1,064,285

1,024,156

Masbate
681,509

40,867

(7,435
)
100,477

815,418

 
(248,021
)
(51,859
)
4,264

(295,616
)
 
519,802

433,488

Otjikoto
575,127

64,266

(729
)
—

638,664

 
(238,579
)
(85,288
)
715

(323,152
)
 
315,512

336,548

Limon
217,263

35,099

(252,362
)
—

—

 
(149,541
)
(10,608
)
160,149

—

 
—

67,722

Libertad
315,569

20,721

(336,290
)
—

—

 
(295,715
)
(5,712
)
301,427

—

 
—

19,854

 
2,957,959

317,847

(599,336
)
100,477

2,776,947

 
(1,076,191
)
(269,143
)
467,986

(877,348
)
 
1,899,599

1,881,768

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exploration & evaluation properties (non-depletable)
Kiaka
73,173

3,634

—

—

76,807

 
—

—

—

—

 
76,807

73,173

Anaconda Regional
21,903

5,236

—

—

27,139

 
—

—

—

—

 
27,139

21,903

Toega
19,581

2,440

—

(22,021
)
—

 
—

—

—

—

 
—

19,581

Mocoa Royalty
10,230

—

—

—

10,230

 
—

—

—

—

 
10,230

10,230

Ondundu
8,273

1,505

—

—

9,778

 
—

—

—

—

 
9,778

8,273

Finland
5,947

750

—

—

6,697

 
—

—

—

—

 
6,697

5,947

Other
13,542

8,557

(7,778
)
—

14,321

 
—

—

—

—

 
14,321

13,542

 
152,649

22,122

(7,778
)
(22,021
)
144,972

 
—

—

—

—

 
144,972

152,649

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate
 
 
 
 
 
 
 
 
 
 
 
 
 
Office, furniture & equipment
2,518

2,453

—

—

4,971

 
(1,838
)
(973
)
—

(2,811
)
 
2,160

680

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3,113,126

342,422

(607,114
)
78,456

2,926,890

 
(1,078,029
)
(270,116
)
467,986

(880,159
)
 
2,046,731

2,035,097

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investments in joint ventures and associates (accounted for using the equity method)
Gramalote
72,078

5,187

—

—

77,265

 
—

—

—

—

 
77,265

72,078

Calibre
—

51,050

—

2,421

53,471

 
—

—

—

—

 
53,471

—


72,078

56,237

—

2,421

130,736

 
—

—

—

—

 
130,736

72,078

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3,185,204

398,659

(607,114
)
80,877

3,057,626

 
(1,078,029
)
(270,116
)
467,986

(880,159
)
 
2,177,467

2,107,175

 
Cost
 
Accumulated depreciation
 
Net carrying value
 
Balance at Dec. 31, 2017
Additions
Disposals / 
write-offs / impairment
Reclass
Balance at Dec. 31, 2018
 
Balance at Dec. 31, 2017
Depreciation
Disposals / 
write-offs
Balance at Dec. 31, 2018
 
As at Dec. 31, 2018
As at Dec. 31, 2017
$
$
$
$
$
 
$
$
$
$
 
$
$
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Property, plant and equipment (depletable)
 
 
 
 
 
 
 
 
 
 
 
 
 
Fekola
1,094,784

71,767

(325
)
2,265

1,168,491

 
(35,477
)
(108,895
)
37

(144,335
)
 
1,024,156

1,059,307

Masbate
625,722

56,598

(811
)
—

681,509

 
(193,925
)
(54,907
)
811

(248,021
)
 
433,488

431,797

Otjikoto
527,069

52,386

(4,328
)
—

575,127

 
(163,153
)
(76,608
)
1,182

(238,579
)
 
336,548

363,916

Limon
173,358

30,836

13,069

—

217,263

 
(127,740
)
(22,124
)
323

(149,541
)
 
67,722

45,618

Libertad
335,651

31,544

(51,626
)
—

315,569

 
(263,838
)
(32,501
)
624

(295,715
)
 
19,854

71,813

 
2,756,584

243,131

(44,021
)
2,265

2,957,959

 
(784,133
)
(295,035
)
2,977

(1,076,191
)
 
1,881,768

1,972,451

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exploration & evaluation properties (non-depletable)
Kiaka
69,989

2,697

—

487

73,173

 
—

—

—

—

 
73,173

69,989

Anaconda Regional
17,211

4,692

—

—

21,903

 
—

—

—

—

 
21,903

17,211

Toega
10,603

8,978

—

—

19,581

 
—

—

—

—

 
19,581

10,603

Mocoa
29,041

7

(18,186
)
(632
)
10,230

 
—

—

—

—

 
10,230

29,041

Ondundu
5,246

3,027

—

—

8,273

 
—

—

—

—

 
8,273

5,246

Finland
2,991

2,956

—

—

5,947

 
—

—

—

—

 
5,947

2,991

Other
15,890

5,779

(7,640
)
(487
)
13,542

 
—

—

—

—

 
13,542

15,890

 
150,971

28,136

(25,826
)
(632
)
152,649

 
—

—

—

—

 
152,649

150,971

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate
 

 

 

 

 

 
 

 

 

 

 
 

 

Office, furniture & equipment
2,264

254

—

—

2,518

 
(1,553
)
(285
)
—

(1,838
)
 
680

711

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2,909,819

271,521

(69,847
)
1,633

3,113,126

 
(785,686
)
(295,320
)
2,977

(1,078,029
)
 
2,035,097

2,124,133

 

 
 
 
 
 
 
 
 
 
 
 
 
Investments in joint ventures and associates (accounted for using the equity method)
Gramalote
65,830

6,248

—

—

72,078

 
—

—

—

—

 
72,078

65,830

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2,975,649

277,769

(69,847
)
1,633

3,185,204

 
(785,686
)
(295,320
)
2,977

(1,078,029
)
 
2,107,175

2,189,963
Disclosure of significant unobservable inputs used in fair value measurement of assets
Key assumptions used for the impairment test at December 31, 2019 were:
Long-term gold price
$1,350/ounce

Silver price
$17/ounce

Mine life
2036

Discount rate
5
%
Disclosure of investments accounted for using equity method [text block]
The following table summarizes the change in the carrying amount of the Company's investment in associate:
 
 
2019

 
 
$

 
 
 
Balance, beginning of year
 
—

Transfers from long-term investments (Note 9)
 
2,421

Shares issued in consideration for Nicaraguan Group (Note 6)
 
39,997

Shares issued upon conversion of convertible debenture
 
9,939

Share of income for the period
 
1,114

Balance, end of year
 
53,471