Commitments and Contigencies (Details Textual)		3 Months Ended		9 Months Ended
	Oct. 02, 2014 USD ($)	Sep. 30, 2015 USD ($) oz	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) oz	Oct. 14, 2009 m	Jan. 21, 2009
Business Acquisition [Line Items]
Price per ounce under agreement		$ 412		$ 412
Maximum Height for Temporary Restriction on Mining | m					4,400
NSR royalty percentage			3.40%
NSR royalty maximum amount			$ 39,400,000
Percentage of labor force covered by collective bargaining agreements		10.80%		10.80%
Purchased royalty						50.00%
Royalty agreement minimum obligation for the period | oz		400,000
Rochester [Member]
Business Acquisition [Line Items]
Royalty expenses				$ 0
Gold price per ounce for maximum royalty range		$ 24.50
Maximum royalty payable		$ 250,000		250,000
Maximum royalty range for gold price per ounce		5.00%
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
Deposits received under gold stream agreement		$ 4,000,000		$ 14,000,000
Rochester Royalty Obligation [Member] | Maximum [Member]
Business Acquisition [Line Items]
Remaining ounces under royalty obligation | oz		26,200,000		26,200,000