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INVESTMENTS IN JOINT VENTURES AND ASSOCIATE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Oct. 02, 2018
Investment in associates and joint ventures
Investment in equity method	$ 18.3	$ 23.7
Equity in losses of joint ventures and associate	(0.3)	(1.3)
Bald Mountain Exploration Joint Venture
Investment in associates and joint ventures
Percentage of equity interest acquired			50.00%
Puren
Investment in associates and joint ventures
Investment in equity method	18.3	18.2
Equity in losses of joint ventures and associate	0.1	(0.1)
Bald Mountain Exploration Joint Venture
Investment in associates and joint ventures
Investment in equity method		5.5
Equity in losses of joint ventures and associate	$ (0.4)	(0.7)
Cerro Casale
Investment in associates and joint ventures
Equity in losses of joint ventures and associate		$ (0.5)

X

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose of investment associates and joint venture.

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