DBD16 v Minister for Immigration & Anor

This case concerned the validity of a purported appointment of a proclaimed port within the Territory of Ashmore and Cartier Islands under section 5(5)(a) of the *Migration Act 1958* (Cth). The applicant, DBD16, challenged the Minister for Immigration's delegate's decision to refuse to grant a visa, arguing that the proclaimed port, established by an instrument published in 2002, was invalid. The core dispute revolved around whether the Minister had the lawful power to appoint such a port and whether the instrument itself was validly constituted.

The court was required to determine several key legal issues. Primarily, it had to consider whether the Minister could lawfully appoint a port over waters within the Territory of Ashmore and Cartier Islands under section 5(5) of the *Migration Act*. This involved examining whether the appointment was for the "purposes" of the Act, and whether the term "port" in this context necessitated pre-existing infrastructure, regularity of trade, or the presence of immigration personnel. Further sub-issues included whether the appointment was a valid exercise of the Commonwealth's "trade or commerce" or "external affairs" powers, whether it constituted an unconstitutional exercise of legislative power, and whether it was a disproportionate exercise of the Minister's statutory powers. Additionally, the court had to assess the facial validity of the instrument of appointment, specifically concerning an alleged omission of a degree of longitude and the incorporation of a reference to "mean low water."

In its reasoning, the court analysed the definition of "migration zone" and "port" within section 5 of the *Migration Act*. It noted that a "proclaimed port" could be appointed by the Minister under subsection 5(5). The court considered the applicant's arguments regarding the interpretation of "port," including the necessity of infrastructure and trade. However, the applicant ultimately conceded that they had entered the area described in the instrument, thereby removing the need for the court to definitively rule on the factual question of entry. The court's judgment focused on the legal challenges to the validity of the proclaimed port appointment itself.

The court found that the instrument of appointment was invalid on its face due to an omission of a degree of longitude. Consequently, the purported appointment of the proclaimed port was held to be invalid. As a result, the court ordered that the appeal be allowed and the decision of the delegate of the Minister be set aside.