Annual report pursuant to Section 13 and 15(d)

Restricted Cash (Details)

v3.6.0.2
Restricted Cash (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Restricted Cash    
Non-current restricted cash $ 7,557,000 $ 7,557,000
Reclamation bonding requirement 26,688  
Certificate of deposit [Member]    
Restricted Cash    
Non-current restricted cash 100,000 100,000
Money Market Funds [Member]    
Restricted Cash    
Non-current restricted cash 7,457,000 $ 7,457,000
Money Market Funds [Member] | Surety Bond [Member]    
Restricted Cash    
Restricted cash pledged as collateral $ 7,444,000