Wardens of South West Mineral Field & Ors Ex parte Ctwealth of A

The applicants, the Wardens of the South West Mineral Field and others, sought a writ of certiorari to quash a decision of the Warden of the South West Mineral Field. The dispute concerned the validity of a mineral lease granted to the respondent, Ctwealth of A, over land that the applicants claimed was subject to a prior, validly registered mineral claim. The matter came before Gummow J in chambers.

The central legal issue before the Court was whether the Warden had erred in law by granting the mineral lease to Ctwealth of A when there was a pre-existing, registered mineral claim over the same land. This required the Court to consider the proper interpretation and application of the relevant provisions of the *Mining Act 1978* (WA), particularly those pertaining to the registration of claims and the granting of leases, and the effect of such registration on subsequent applications.

Gummow J reasoned that the *Mining Act* established a system where priority was determined by the order of registration of claims. The prior registration of the applicants' mineral claim created a statutory right that the Warden was bound to respect. The granting of a lease to Ctwealth of A over land already subject to a registered claim, without addressing or resolving the priority dispute, constituted an error of law. The principle applied was that a Warden's jurisdiction is circumscribed by the statutory framework, and failure to adhere to the established priority rules rendered the subsequent decision invalid.

The Court ordered that the decision of the Warden of the South West Mineral Field granting the mineral lease to Ctwealth of A be quashed.