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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Recurring Measurements of Fair Value of Assets and Liabilities

Recurring measurements of the fair value of assets and liabilities as of June 30, 2018 and December 31, 2017 are as follows:

 

    June 30, 2018     December 31, 2017  
    Level 1     Level 2     Level 3     Total     Level 1     Level 2     Level 3     Total  
                                                 
Marketable equity securities:                                                                
Sutter Gold Mining Company   $ 10     $ -     $ -     $ 10     $ 8     $ -     $ -     $ 8  
Anfield Resources, Inc.     743       -       -       743       868       -       -       868  
Total   $ 753     $ -     $ -     $ 753     $ 878     $ -     $ -     $ 876  
                                                                 
Commodity price risk derivatives   $ -     $ 24       -     $ 24       -     $ 161       -     $ 161  
Outstanding warrant liability     -       -       1,010       1,010     $ -       -       1,200       1,200  
Total   $ -     $ 24     $ 1,010     $ 1,034             $ 161     $ 1,200     $ 1,361  

Schedule of Reconciliation of Changes in Assets and Liabilities Measured at Fair Value On a Recurring Basis

The following table presents a reconciliation of changes in liabilities measured at Level 3 fair value on a recurring basis for the period ended June 30, 2018 and the year ended December 31, 2017.

 

Liabilities            
Warrants            
(Level 3)   2018     2017  
             
Fair value, as of December 31, 2017 and 2016   $ 1,200     $ 1,030  
                 
Total net losses included in:                
Other comprehensive loss     -       -  
Fair value adjustments included in net loss:                
Net fair value adjustment     (190 )     170  
Fair value, June 30, 2018, and December 31, 2017   $ 1,010     $ 1,200