105 Westgold Resources Limited Annual Report 2023 A member firm of Ernst & Young Global Limited Liability limited by a scheme approved under Professional Standards Legislation 3 Why significant How our audit addressed the key audit matter assumptions were consistent with those used elsewhere in the financial report. ► Assessed the impact of a range of sensitivities to the economic assumptions underpinning the Group's impairment assessment. ► Evaluated the adequacy of the Group's disclosures in the financial report relating to impairment. 2. Rehabilitation and restoration provisions Why significant How our audit addressed the key audit matter As a consequence of its operations, the Group incurs obligations to restore and rehabilitate the environment at its mine sites. Rehabilitation activities are governed by local legislative requirements. As at 30 June 2023 the Group’s consolidated statement of financial position includes provisions of $62.6m in respect of such obligations (refer to Note 22 of the financial report). Estimating the costs associated with these future activities requires considerable judgment in relation to factors such as timing of the rehabilitation, the costs associated with the rehabilitation activities and economic assumptions such as discount rates and inflation rates. Accordingly, this was considered to be a key audit matter. We evaluated the assumptions and methodologies used by the Group in determining their rehabilitation obligations. Our audit procedures included the following: ► Assessed the qualifications, competence and objectivity of the Group’s internal experts, the work of whom, formed the basis of the Group’s rehabilitation cost estimates. ► With the assistance of our subject matter specialists, we assessed the appropriateness of the rehabilitation cost estimates. ► Tested the mathematical accuracy of the rehabilitation models and assessed the appropriateness of the assumed timing of cashflows, inflation and discount rate assumptions. ► Assessed the adequacy of the Group's disclosures in the financial report relating to rehabilitation obligations. Information other than the financial report and auditor’s report thereon The directors are responsible for the other information. The other information comprises the information included in the Company’s 20X1 annual report other than the financial report and our auditor’s report thereon. We obtained the corporate directory, the directors’ report and the letter from the chair that are to be included in the annual report, prior to the date of this auditor’s report, and we expect to obtain the remaining sections of the annual report after the date of this auditor’s report. Our opinion on the financial report does not cover the other information and we do not and will not express any form of assurance conclusion thereon, with the exception of the Remuneration Report and our related assurance opinion.
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