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Nature of activities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019
Canadian Malartic Mine [Member]
Nature Of Activities [Line Items]
Net smelter return	5.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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- Definition

Net smelter return

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No definition available.

+ Details

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