Wardens of South West Mineral Fields & Ors- Ex parte Cwealth of A

This matter concerned an application for a writ of prohibition brought by the Commonwealth of Australia against the Wardens of the South West Mineral Fields and others. The Commonwealth sought to prohibit the Wardens from proceeding with an inquiry into the alleged contravention of the *Mining Act 1978* (WA) by the Commonwealth. The dispute arose from the Commonwealth's assertion of sovereign immunity in relation to certain activities conducted on Commonwealth land.

The central legal issue before McHugh J was whether the Wardens had jurisdiction to inquire into the alleged contravention of the *Mining Act 1978* (WA) by the Commonwealth, given the Commonwealth's claim of sovereign immunity. Specifically, the court had to determine if the Commonwealth's activities, which were the subject of the inquiry, were of a nature that attracted immunity from state legislation.

McHugh J reasoned that the *Mining Act 1978* (WA) was a law of a State and, as such, could not apply to the Commonwealth in a way that would impair its sovereign capacity. His Honour considered that the Commonwealth's activities, which involved the exploration and extraction of minerals on Commonwealth land, were intrinsically governmental functions. Therefore, the Commonwealth was entitled to sovereign immunity from the operation of the State's mining legislation in relation to these activities. The application for a writ of prohibition was granted.