Commitments and Contigencies (Details Textual) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
	Jan. 21, 2009	Mar. 31, 2015 oz	Mar. 31, 2014	Oct. 02, 2014	Oct. 14, 2009 m
Business Acquisition [Line Items]
Price per ounce under agreement		$ 412
Maximum Height for Temporary Restriction on Mining					4,400
NSR royalty percentage			3.40%
NSR royalty maximum amount			39,400,000
Percentage of labor force covered by collective bargaining agreements		10.70%
Purchased royalty	50.00%
Royalty agreement minimum obligation for the period		400,000
Royalty Agreement Minimum Obligation for Per Month		4,167
Royalty Agreement Period	8 years
Rochester [Member]
Business Acquisition [Line Items]
Royalty expenses		0
Gold price per ounce for maximum royalty range		23.60
Maximum royalty payable		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		$ 5,000,000		$ 22,000,000
Rochester Royalty Obligation [Member] | Maximum [Member]
Business Acquisition [Line Items]
Payable ounces under royalty obligation		6,100,000
Remaining ounces under royalty obligation		33,300,000