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Expenses and Other Income - Summary of Expenses and Other Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Employee benefits expense:      
Wages, salaries and redundancies $ 4,399,000 $ 3,706,000 $ 3,683,000
Employee share awards 123,525 128,999 138,275
Social security costs 3,000 2,000 4,000
Pension and other post-retirement obligations 316,000 283,000 292,000
Less employee benefits expense classified as exploration and evaluation expenditure (119,000) (65,000) (85,000)
Changes in inventories of finished goods and work in progress (334,000) (326,000) 496,000
Raw materials and consumables used 4,940,000 5,509,000 4,591,000
Freight and transportation 2,037,000 1,981,000 2,378,000
External services 5,260,000 4,404,000 4,745,000
Third party commodity purchases 2,230,000 1,139,000 1,069,000
Net foreign exchange losses/(gains) 310,000 (603,000) (147,000)
Fair value change on derivatives 145,000 422,000 8,000
Government royalties paid and payable 3,217,000 2,362,000 2,538,000
Exploration and evaluation expenditure incurred and expensed in the current period 430,000 517,000 516,000
Depreciation and amortisation expense 6,824,000 6,112,000 5,829,000
Net impairments:      
Property, plant and equipment 2,583,000 494,000 250,000
Goodwill and other intangible assets 52,000   14,000
All other operating expenses 2,083,000 2,709,000 1,703,000
Total expenses 34,500,000 28,775,000 28,022,000
Insurance recoveries (46,000) (489,000) (57,000)
Other income (464,000) (288,000) (336,000)
Total other income $ (510,000) $ (777,000) $ (393,000)