ACQUISITION OF EL PILAR MINE (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
Jul. 06, 2015	Sep. 30, 2016	Dec. 31, 2015
El Pilar
Recognized amounts of identifiable assets acquired and liabilities assumed
Goodwill		$ 25.0
Stingray
Acquisition of El Pilar mine
Percentage of interest acquired	100.00%
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash		0.1	$ 0.1
Trade accounts receivable		0.3	0.3
Mining assets		57.2	93.0
Value beyond proven and probable mineral reserves		29.5
Exploration cost		7.5	10.5
Deferred income tax asset		5.5
Deferred income tax liability		(25.0)	(24.7)
Trade accounts payable		(0.1)	(3.6)
Total identifiable net assets		75.0	75.6
Goodwill		25.0	24.4
Total paid	$ 100.0	$ 100.0	$ 100.0
Stingray \| El Pilar
Acquisition of El Pilar mine
Percentage of interest in mine concession	100.00%

Amount of exploration costs recorded as asset acquired at the acquisition date.

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Amount of legal right to explore, extract, and retain some or all portions of the benefits from mining or mineral deposits and properties used for mining acquired at the acquisition date.

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Amount of value beyond proven and probable mineral reserves (VBPP) acquired at the acquisition date.

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- Definition

Represents the percentage of ownership interests in the mine concessions.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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Amount, after allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date, classified as noncurrent.

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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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