Acquisition of Joaquin Mineral Interests (Tables)

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The total consideration paid for the asset acquisition was as follows (in thousands):

Consideration:
Common shares issued (1,310,043 at $22.90)	$	30,000
Cash	30,000
Transaction advisory fees and other acquisition costs	1,224
Total purchase price	61,224
Current liabilities	80
Deferred income taxes	32,540
Total liabilities assumed	32,620
Total consideration	$	93,844

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following summarizes the estimated fair value of the assets acquired on December 21, 2012 (in thousands):    

Fair value of assets acquired:
Cash	$	42
Other current assets	353
Mineral interests (Note 13)	93,429
Other assets	20
Total assets acquired	$	93,844