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Expenses and Other Income - Summary of Expenses and Other Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Employee benefits expense: |  |  |
Wages, salaries and redundancies | $ 3,653,000 | $ 3,392,000 | $ 3,324,000
Employee share awards | 123,313 | 106,214 | 140,445
Social security costs | 4,000 | 3,000 | 2,000
Pension and other post-retirement obligations | 292,000 | 273,000 | 221,000
Less employee benefits expense classified as exploration and evaluation expenditure | (82,000) | (79,000) | (82,000)
Changes in inventories of finished goods and work in progress | (142,000) | (743,000) | 287,000
Raw materials and consumables used | 4,389,000 | 3,830,000 | 3,985,000
Freight and transportation | 2,294,000 | 1,786,000 | 1,648,000
External services | 5,217,000 | 4,341,000 | 4,370,000
Third party commodity purchases | 1,452,000 | 1,151,000 | 994,000
Net foreign exchange (gains)/losses | (93,000) | 103,000 | (153,000)
Government royalties paid and payable | 2,168,000 | 1,986,000 | 1,349,000
Exploration and evaluation expenditure incurred and expensed in the current period | 641,000 | 610,000 | 419,000
Depreciation and amortisation expense | 6,288,000 | 6,184,000 | 6,210,000
Net impairments: |  |  |
Property, plant and equipment | 838,000 | 160,000 |
Goodwill and other intangible assets | 2,353,000 | 33,000 |
Available for sale financial assets | 1,000 |  |
Operating lease rentals | 421,000 | 391,000 | 372,000
All other operating expenses | 1,078,000 | 989,000 | 819,000
Total expenses | 28,036,000 | 24,515,000 | 24,091,000
Losses/(Gains) on disposal of property, plant and equipment | 10,000 | (286,000) | 20,000
Other income | (257,000) | (376,000) | (452,000)
Total other income | (247,000) | (662,000) | (432,000)
Continuing operations [member] |  |  |
Net impairments: |  |  |
Property, plant and equipment | 318,000 | 160,000 | 170,000
Goodwill and other intangible assets | $ 14,000 | $ 33,000 | $ 16,000

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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_23_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_28_e&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_102&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_104&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_24_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_9&doctype=Standard -URIDate 2017-03-09 + Details
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