Duncan v The State of New South Wales; NuCoal Resources Limited v State of New South Wales; Cascade Coal Pty Limited & Ors v The State of New South Wales

The High Court of Australia considered appeals from the Supreme Court of New South Wales in three related proceedings brought by Duncan, NuCoal Resources Limited, and Cascade Coal Pty Limited and others against the State of New South Wales. The core of the dispute concerned the validity of certain decisions made by the Minister for Planning and Infrastructure in relation to the granting of mining exploration licences and the subsequent approval of a mining project. The appellants sought declarations that the Minister's decisions were invalid and that they were entitled to compensation.

The central legal issues before the High Court were whether the Minister's decisions to grant exploration licences and to approve the mining project were vitiated by apprehended bias, and consequently, whether those decisions were invalid. The appellants argued that the Minister's involvement in negotiations and communications with a third party, particularly in relation to the potential for future development and the acquisition of land, created a reasonable apprehension that the Minister was not impartial in considering the applications. This, they contended, rendered the decisions invalid for want of procedural fairness.

The High Court, by majority, held that there was no reasonable apprehension of bias. The Court reasoned that the Minister's conduct, including communications and negotiations, did not demonstrate a pre-judgment of the merits of the applications or an inability to bring an impartial mind to bear on the decision-making process. The principles applied focused on the test for apprehended bias, which requires an informed, objective observer to reasonably apprehend that the decision-maker might not bring an impartial mind to the question. The Court found that the evidence did not support such an apprehension, as the Minister's actions were consistent with the proper exercise of statutory powers and the discharge of public duties, including engaging in discussions about future land use and development.

Consequently, the High Court dismissed the appeals, upholding the validity of the Minister's decisions.