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SEGMENT INFORMATION - Reconciliation of total segment gross profit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
SEGMENT INFORMATION        
Total segment gross profit $ 62,510 $ 50,381 $ 183,012 $ 129,812
Costs and expenses        
General and administrative expenses 9,551 6,798 23,658 24,147
Exploration costs 565 330 4,705 5,534
Depreciation and amortization 113 52 280 146
Operating income 52,281 43,201 154,369 99,985
Fair value changes in equity securities (3,819) 1,781 (4,972) (3,318)
Interest and other income 620 499 1,621 1,089
Interest and other expense (2,088) (7,499) (7,139) (22,786)
Income before income taxes $ 46,994 $ 37,982 $ 143,879 $ 74,970