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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

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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2019-en-r&anchor=para_24_b&doctype=Standard -URIDate 2019-03-27 + Details
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