The amount of future capital expenditures that the entity is committed to make.

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The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

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Reference 1: 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 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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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Represents the number of lawsuits.

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COMMITMENTS AND CONTINGENCIES (Details)	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details)	Dec. 31, 2013 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 02, 2016 lawsuit
Commitments and contingencies
Future capital expenditures		$ 192,700,000	$ 108,900,000
Compania Minera Maricunga \| Legal Proceedings Contingent Liability
Commitments and contingencies
Regulatory fine	$ 40,000
Number of lawsuits \| lawsuit				2
2018
Commitments and contingencies
Future minimum lease payments		25,900,000
2019
Commitments and contingencies
Future minimum lease payments		12,500,000
2020
Commitments and contingencies
Future minimum lease payments		4,900,000
2021
Commitments and contingencies
Future minimum lease payments		2,900,000
2022
Commitments and contingencies
Future minimum lease payments		2,900,000
2023 and thereafter
Commitments and contingencies
Future minimum lease payments		$ 800,000