INVESTMENT IN JOINT VENTURE (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investment in joint venture
Investment in joint venture	$ 7.1	$ 18.3
Sociedad Contractual Minera Puren
Investment in joint venture
Investment in joint venture	$ 7.1	$ 18.3

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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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