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Supplementary cash flow information (Tables)
 12 Months Ended
Dec. 31, 2018
Statement of cash flows [abstract]  
Disclosure Of Supplementary Cash Flow Information
Supplementary disclosure of cash flow information is provided in the table below:

Non-cash (credits) charges:
 
 
2018

 
2017

 
 
$

 
$

 
 
 
 
 
Depreciation and depletion
 
306,429

 
160,469

Delivery into prepaid sales (Note 13)
 
(60,000
)
 
(60,000
)
Share-based payments (Note 12)
 
21,693

 
18,127

Impairment of long-lived assets, net (Note 8)
 
55,353

 
—

Gain on sale of Lynn Lake royalty (Note 8)
 
—

 
(6,593
)
Write-down of mineral property interests (Note 8)
 
9,398

 
4,150

Provision for non-recoverable input taxes
 
1,646

 
2,180

Unrealized (gain) loss on fair value of convertible notes (Note 10)
 
(10,651
)
 
11,144

Interest and financing expense
 
28,589

 
9,728

Unrealized loss (gain) on derivative instruments (Note 14)
 
4,757

 
(9,684
)
Write-down of long-term investments
 
—

 
1,613

Deferred income tax expense (recovery) (Note 16)
 
38,392

 
(20,170
)
Other
 
657

 
(1,146
)
 
 
396,263

 
109,818


Changes in non-cash working capital:
 
 
2018

 
2017

 
 
$

 
$

 
 
 
 
 
Accounts receivable and prepaids
 
3,345

 
(6,768
)
Value-added and other tax receivables
 
4,272

 
(4,441
)
Inventories
 
(41,186
)
 
(58,059
)
Accounts payable and accrued liabilities
 
1,361

 
20,386

Current income and other taxes payable
 
40,838

 
9,201

 
 
8,630

 
(39,681
)

Other exploration and development:
 
 
2018

 
2017

 
 
$

 
$

 
 
 
 
 
Fekola Mine, exploration
 
(14,246
)
 
(8,441
)
Otjikoto Mine, exploration
 
(1,744
)
 
(1,220
)
Masbate Mine, exploration
 
(4,941
)
 
(4,668
)
Libertad Mine, exploration
 
(4,798
)
 
(6,751
)
Limon Mine, exploration
 
(6,247
)
 
(6,362
)
Toega Project, exploration
 
(8,688
)
 
(5,784
)
Fekola Regional, exploration
 
(6,291
)
 
(6,245
)
Ondundu Project, exploration
 
(3,027
)
 
(3,116
)
Finland Properties, exploration
 
(2,479
)
 
(1,341
)
Kiaka Project, exploration
 
(2,238
)
 
(4,512
)
Other
 
(5,439
)
 
(5,233
)
 
 
(60,138
)
 
(53,673
)

Non-cash investing and financing activities:
 
 
2018

 
2017

 
 
$

 
$

 
 
 
 
 
Non-controlling interest sold in exchange for loan receivable (Note 8)
 
47,000

 
—

Interest on loan to non-controlling interest
 
1,352

 
—

Share-based payments, capitalized to mineral property interests
 
2,507

 
3,622

Change in current liabilities relating to mineral property expenditures
 
(14,277
)
 
(6,759
)
Foreign exchange gain (loss) on Fekola equipment loan facility
 
3,312

 
(4,776
)
Interest expense, capitalized to mineral property interests
 
—

 
20,052

Common shares issued for purchase of non-controlling interest
 
—

 
(2,000
)