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Supplemental cash flow information (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Changes In Non Cash Working Capital
Accounts receivable	$ (44,353)	$ (174,613)
Inventories	241,496	299,980
Supplies and prepaid expenses	52,192	15,436
Accounts payable and accrued liabilities	(39,616)	(64,689)
Reclamation payments	(31,311)	(14,334)
Other	4,654	25,277
Other operating items	$ 183,062	$ 87,057

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Adjustments for decrease (increase) in supplies and prepaid to reconcile profit (loss) to net cash flow from (used in) operating activities.

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The amount of payments for costs related to decommissioning, restoration and rehabilitation.

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Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]

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Adjustments for decrease (increase) in other assets to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other assets; Profit (loss)]

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Adjustments for increase (decrease) in trade and other payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other payables; Profit (loss)]

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Inflows (outflows) of cash, classified as operating activities, that the entity does not separately disclose in the same statement or note.

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