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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in the carrying amounts of the ARO
The changes in the carrying amount of the ARO during the years ended December 31, 2012, and December 31, 2011, are as follows:
 
For the years ended
December 31,
 
2012
 
2011
Beginning balance
$
33,880

 
$
44,952

Accretion expense
2,816

 
3,845

Additions and changes in estimates
3,620

 
11,978

Cost of reclamation work performed
(6,203
)
 
(26,895
)
Balance at December 31
$
34,113

 
$
33,880

 
 
 
 
Current portion
$
9,943

 
$
8,996

Long term portion
$
24,170

 
$
24,884