XML 54 R42.htm IDEA: XBRL DOCUMENT v3.8.0.1
Mineral Properties - Additional Information (Details)
Sep. 30, 2017
a
MiningClaim
Sleeper Gold Project | Nevada  
Mineral Properties [Line Items]  
Unpatented mining claims 2,322
Area covered by lode mining claims | a 38,300
Grassy Mountain Project | Oregon  
Mineral Properties [Line Items]  
Unpatented lode mining claims 418
Patented lode mining claims 3
Mill site mining claims 9
Association placer claims 6
Area covered by mining claims | a 9,300