Robe River Mining Co Pty Ltd v The Commissioner of Taxation

Robe River Mining Co Pty Ltd (the taxpayer) appealed to the High Court of Australia against a decision of the Full Federal Court concerning the deductibility of exchange losses on borrowings. The taxpayer, a mining company, sought to amortise these losses under Division 10 of the *Income Tax Assessment Act* (the Act). The Commissioner of Taxation (the respondent) opposed this claim.

The central legal issue before the High Court was whether exchange losses incurred on borrowings constituted allowable capital expenditure that could be amortised by a mining company under Division 10 of the Act. This involved interpreting the phrase "in carrying on prescribed mining operations" within the context of section 122A of the Act, and determining the appropriate approach to the word "in" in that phrase.

The taxpayer argued that the word "in" in section 122A should be interpreted broadly, analogous to its meaning in section 51 of the Act, which allows deductions for expenses incurred "in the course of carrying on" business activities. The taxpayer contended that Division 10, which deals with capital expenditure for mining operations, serves a similar purpose to section 51 by allowing deductions for expenditure that is consumed or dissipated over the life of the income-earning endeavour. The taxpayer found support for this broader interpretation in the High Court's approach to the word "necessary" in the *BHP* case, suggesting a comparable, less restrictive meaning should be applied.