Northern Territory of Aust & Ors v Mengel

The High Court of Australia heard an appeal from the Supreme Court of the Northern Territory in *Northern Territory of Australia & Ors v Mengel*. The dispute concerned the validity of a notice issued by the Northern Territory Minister for Lands and Housing, which purported to resume land owned by Mr. Mengel for the purpose of constructing a public road. Mr. Mengel contended that the notice was invalid because the Minister had not genuinely formed the opinion required by the relevant legislation that the land was required for a public purpose.

The central legal issue before the High Court was whether the Minister's purported opinion that the land was required for a public purpose was a prerequisite for the valid exercise of the power to resume land under the *Lands Acquisition Act 1978* (NT). Specifically, the Court had to determine if the Minister's subjective belief was a question of fact that could be challenged, and if so, on what grounds. The Court also considered the implications of the Minister's stated reasons for the resumption, which included a desire to prevent Mr. Mengel from developing the land in a manner that would obstruct the proposed road.

The High Court held that the Minister's opinion was a jurisdictional fact, meaning that its existence was a condition precedent to the valid exercise of the power to resume land. The Court found that the Minister had not genuinely formed the opinion that the land was required for a public purpose, but rather had acted for an ulterior purpose – to prevent Mr. Mengel's development. This failure to form a genuine opinion rendered the notice of resumption invalid. The Court applied the principle that where a power is conferred for a specific purpose, it cannot be exercised for an improper or ulterior purpose.

The appeal was dismissed, and the notice of resumption was declared invalid.