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SEGMENT INFORMATION - Reconciliation of total segment gross profit (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
SEGMENT INFORMATION    
Total segment gross profit $ 77,409 $ 58,903
Costs and expenses    
General and administrative expenses 7,454 7,443
Exploration costs 563 2,626
Depreciation and amortization 86 53
Gain on sale of Peak Gold JV interest 33,906  
Operating income 103,212 48,781
Fair value changes in equity securities 2,539 (1,375)
Interest and other income 421 775
Interest and other expense (1,875) (2,834)
Income before income taxes $ 104,297 $ 45,347