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Expenses and Other Income - Summary of Expenses and Other Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Employee benefits expense:      
Wages, salaries and redundancies $ 3,706,000 $ 3,683,000 $ 3,653,000
Employee share awards 128,999 138,275 123,313
Social security costs 2,000 4,000 4,000
Pension and other post-retirement obligations 283,000 292,000 292,000
Less employee benefits expense classified as exploration and evaluation expenditure (65,000) (85,000) (82,000)
Changes in inventories of finished goods and work in progress (326,000) 496,000 (142,000)
Raw materials and consumables used 5,509,000 4,591,000 4,389,000
Freight and transportation 1,981,000 2,378,000 2,294,000
External services 4,404,000 4,745,000 4,786,000
Third party commodity purchases 1,139,000 1,069,000 1,374,000
Net foreign exchange gains (603,000) (147,000) (93,000)
Fair value change on derivatives 422,000 8,000 208,000
Government royalties paid and payable 2,362,000 2,538,000 2,168,000
Exploration and evaluation expenditure incurred and expensed in the current period 517,000 516,000 641,000
Depreciation and amortisation expense 6,112,000 5,829,000 6,288,000
Net impairments:      
Property, plant and equipment 494,000 250,000  
Goodwill and other intangible assets   14,000  
Available for sale financial assets     1,000
Lease costs 675,000 405,000 421,000
All other operating expenses 2,034,000 1,298,000 870,000
Total expenses 28,775,000 28,022,000 27,527,000
Insurance recoveries (489,000) (57,000)  
Other income (288,000) (336,000) (247,000)
Total other income (777,000) (393,000) (247,000)
Continuing operation [member]      
Net impairments:      
Property, plant and equipment $ 494,000 250,000 318,000
Goodwill and other intangible assets   $ 14,000 $ 14,000