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SEGMENTED INFORMATION - Information about major customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
SEGMENTED INFORMATION
Revenue	$ 630.6	$ 604.5
Customer [Member]
SEGMENTED INFORMATION
Revenue	558.2	490.7
Rainy River
SEGMENTED INFORMATION
Revenue	358.9	274.4
Rainy River | Customers one [Member]
SEGMENTED INFORMATION
Revenue	128.9	137.9
Rainy River | Customers two [Member]
SEGMENTED INFORMATION
Revenue	126.7	78.0
Rainy River | Customers three [Member]
SEGMENTED INFORMATION
Revenue	102.5
New Afton
SEGMENTED INFORMATION
Revenue	271.7	314.1
New Afton | Customers one [Member]
SEGMENTED INFORMATION
Revenue	100.9	109.9
New Afton | Customers two [Member]
SEGMENTED INFORMATION
Revenue	$ 99.2	94.2
New Afton | Customers three [Member]
SEGMENTED INFORMATION
Revenue		$ 70.7

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- Definition

Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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