McArthur River Mining Pty Ltd v Lansen & Ors

McArthur River Mining Pty Ltd, the appellant, sought to appeal a decision by Angel J that had declared invalid the authorisation permitting the conversion of a coal mine. The respondents, Lansen and others, contested the appeal. The matter was before the court on appeal by way of re-hearing, after the legislation had been amended to validate the authorisation both retrospectively and prospectively. The dispute centred on the validity of the authorisation under the Mining Act 1978 (NSW) and the subsequent retrospective amendment to the legislation. The court had to decide whether the retrospective legislation was valid and, if so, whether it justified substituting the original decision by Angel J.

The court examined the legal principles governing appeals by way of re-hearing and the retrospective application of legislation. The court noted that when an appeal is heard by way of re-hearing, the court is empowered to substitute its decision based on the law and facts as they stood at the time of the re-hearing. The court held that the retrospective amendment to the Mining Act was valid as it did not contravene any constitutional or statutory prohibitions on retrospective legislation. The court found that the amendment was justified given the circumstances, including the significant public interest in the mining industry and the need for legislative certainty.

Consequently, the appeal was allowed, and the declarations and orders made by Angel J were set aside. The originating motion filed by the respondents was dismissed. The court determined that the costs of the hearing at first instance should remain undisturbed, as the appeal was allowed based on the amending legislation and not on any error by the trial judge. Regarding the costs of the appeal, the court ordered that each party bear their own costs.