Mining Properties Mining Properties (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Capitalization of Internal Costs, Policy [Policy Text Block]

The determination of commercial production (or ready for intended use) is based on many factors requiring the exercise of judgment.  Factors that are considered when determining if intended use has been achieved include achievement of continuous production or other output, mineral recoveries at or near expected levels, the absence of routine take-downs of the plant to address commissioning issues and fix problems, and the release of the commissioning team.

Prior to commercial production, costs related to mine development, construction of long-lived assets, and inventory are capitalized; all other costs are expensed in the period incurred. Amortization of mining properties will commence when the mine has been determined to be in commercial production.