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DERIVATIVE INSTRUMENTS - Additional information (Details) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2018 lb oz $ / oz	Dec. 31, 2019 item t	Dec. 31, 2019 lb	Dec. 31, 2019 oz	Dec. 31, 2019 USD ($)
Disclosure of derivative instruments
Strike price of put options at the time of purchasing | $ / oz	1,230
Strike price of call options at the time of selling | $ / oz	1,300
Foreign exchange forward contracts
Disclosure of derivative instruments
Amount hedged per month | $					$ 20.0
Average foreign exchange rate | item		1.34
Purchased put options [Member]
Disclosure of derivative instruments
Strike price of copper price option contracts | oz	2.50
Selling call options [Member]
Disclosure of derivative instruments
Strike price of copper price option contracts | lb	3.00
Copper price option contracts [Member]
Disclosure of derivative instruments
Quantity of production		21,600	47,600,000
Gold price option contracts [Member]
Disclosure of derivative instruments
Quantity of production | oz				192,000

X

- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
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- Definition

The amount hedged per month by the derivative instrument.

+ References

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- Definition

The strike price of call options at the time of selling a gold price option contracts.

+ References

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- Definition

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+ References

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- Definition

The strike price of put options at the time of purchasing a gold price option contracts.

+ References

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