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Asset Retirement Obligation (Tables)
12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Total Reclamation Liability for Asset Retirement Obligations

The following is a reconciliation of the total reclamation liability for asset retirement obligations.

 

Balance at December 31, 2014

 

$

1,765

 

Additions to liabilities

 

 

105

 

Reductions to liabilities due to revision of estimates

 

 

(719

)

Accretion expenses

 

 

29

 

Balance at December 31, 2015

 

 

1,180

 

Additions to liabilities

 

 

399

 

Reductions to liabilities due to revision of estimates

 

 

(211

)

Accretion expenses

 

 

16

 

Balance at December 31, 2016

 

$

1,384