Commitments and Contigencies (Details Textual)		12 Months Ended
	Oct. 02, 2014 USD ($)	Dec. 31, 2016 USD ($) oz	Sep. 30, 2016 oz	Oct. 14, 2009 m	Jan. 21, 2009
Business Acquisition [Line Items]
Percentage of labor force covered by collective bargaining agreements			11.00%
NSR royalty percentage		3.40%
NSR royalty maximum amount		$ 39,400,000
Purchased royalty					50.00%
Royalty agreement minimum obligation for the period | oz		400,000
Price per ounce under agreement		$ 416
Maximum Height for Temporary Restriction on Mining | m				4,400
Palmarejo gold production royalty [Member]
Business Acquisition [Line Items]
Payment made for gold on the end of royalty obligation | oz		4,167	4,167
Production to be sold, percent					50.00%
Palmarejo gold production royalty [Member]
Business Acquisition [Line Items]
Termination payment	$ 2,000,000
Production to be sold, percent	50.00%
Price per ounce under agreement	$ 800
Aggregate deposit to be received	$ 22,000,000
Rochester Royalty Obligation [Member]
Business Acquisition [Line Items]
Payable ounces under royalty obligation | oz			18,000,000