SUMMARY OF ACCOUNTING POLICIES - Property, plant and equipment (Details)	12 Months Ended
Dec. 31, 2017
Mobile Mining Equipment
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment, useful life	5 years

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.

No definition available.

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Period Type:	duration