Quarterly report pursuant to Section 13 or 15(d)

GENERAL (Details)

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GENERAL (Details) - Jun. 30, 2015 - Segment
Total
Noncontrolling Interest [Line Items]  
Number of operating segments 2
AMAK [Member]  
Noncontrolling Interest [Line Items]  
Percentage of ownership (in hundredths) 35.00%
Pioche Ely Valley Mines, Inc. ("PEVM) [Member]  
Noncontrolling Interest [Line Items]  
Percentage of ownership (in hundredths) 55.00%