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SEGMENT INFORMATION - Reconciliation of total segment gross profit (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
SEGMENT INFORMATION        
Total segment gross profit $ 61,600 $ 39,762 $ 120,503 $ 79,431
Costs and expenses        
General and administrative expenses 6,665 7,423 14,108 17,349
Exploration costs 1,514 842 4,140 5,204
Depreciation 114 48 167 94
Operating income 53,307 31,449 102,088 56,784
Fair value changes in equity securities 222 (3,631) (1,153) (5,099)
Interest and other income 226 487 1,001 590
Interest and other expense (2,217) (7,410) (5,051) (15,287)
Income before income taxes $ 51,538 $ 20,895 $ 96,885 $ 36,988