XML 39 R25.htm IDEA: XBRL DOCUMENT v3.4.0.3
Organization and Business (Details)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 46 Months Ended
Nov. 29, 2010
USD ($)
a
shares
Mar. 31, 2016
a
Mar. 31, 2016
a
Oct. 31, 2018
USD ($)
Jan. 08, 2015
USD ($)
Sep. 29, 2014
Sep. 01, 2012
a
Subsidiary shares issued | shares 1.6            
Acreage of Unpatented Mining Claims-Alaska             71,896
Royal Gold initial investment | $         $ 5.0    
Royal Gold percentage of interest in Joint Venture         0.00%    
Contango's percentage of interest in Joint Venture Company         100.00%    
royalgoldjointventure | $       $ 30.0      
joint adventure economic interest         40.00%    
additional new mining claims-state of Alaska   59 59        
unpatented mining claims-Eagle   9,439 9,439        
Native Village of Tetlin Land [Member]              
Percentage of Leasehold Interest 100.00%            
Leasehold Interest Acreage 675,000            
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage   10 years 10 years        
Contango [Member]              
Parent contribution | $ $ 3.5            
JEX [Member]              
Overriding royalty interest   3.00% 3.00%        
JEX [Member] | ALASKA              
the number of unpatented state of Alaska mining claims             474
Overriding royalty interest   2.00% 2.00%     2.00% 2.00%
Unpatented Mining Claims from the State of Alaska for Gold and Minerals [Member]              
Acreage of Unpatented Mining Claims 18,021