Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

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Mineral Properties (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2005
Aggregate consideration $ 6,700          
Revenue, Net, Total   $ 5,115 $ 3 $ 21,406 $ 23,482  
Estimated asset reclamation obligation $ 5,700          
Write off of equity investments   $ 11,000        
Nfu Wyoming LLC            
Percentage of asset acquired           100.00%
Aggregate consideration           $ 20,000