Commonwealth of Australia v Northern Land Council

The Commonwealth of Australia sought special leave to appeal from a decision of the Full Federal Court concerning the discovery of documents. The Northern Land Council was the first respondent, and Energy Resources of Australia was the second respondent, though it did not wish to appear. The dispute centred on the extent to which the Commonwealth could claim public interest immunity over documents sought by the Northern Land Council.

The primary legal issue before the High Court was whether an applicant seeking inspection of documents, where public interest immunity is claimed, must demonstrate more than mere relevance to the matters in question. Specifically, the Commonwealth argued that the applicant must show a concrete ground for believing the documents contain material substantially useful for their case, rather than simply relying on the documents relating to the subject matter. A further issue concerned whether the principles of public interest immunity vary between different Australian forums based on their procedural rules, or if these immunities are matters of substance that apply uniformly.

The Commonwealth contended that established High Court authority, including *Sankey v Whitlam* and *Alister v Reg*, supported the proposition that a "balancing exercise" by the court is not warranted if the applicant only shows that the documents relate to the matters in question. It was argued that the approach approved in *Burmah Oil* and *Air Canada* cases, referred to with approval in *Alister*, requires the applicant to demonstrate a substantial ground for believing the documents contain material of significant utility. The Commonwealth also submitted that public interest immunity is a substantive right of the Crown or government, not a procedural matter to be determined by the specific rules of a particular court, such as Order 15 rule 15 of the Federal Court rules.