Jemena Gas Networks (NSW) Limited v Mine Subsidence Board

Jemena Gas Networks (NSW) Limited (Jemena) and the Mine Subsidence Board (the Board) were parties to proceedings in the High Court of Australia concerning the interpretation and application of the *Mine Subsidence Compensation Act 1961* (NSW) (the Act). The dispute arose from Jemena's claim for compensation from the Board for damage to its gas mains caused by mine subsidence. Jemena sought to recover the costs of repairing and replacing its infrastructure, which it argued was a direct consequence of mining operations conducted under the Act.

The central legal issue before the High Court was whether Jemena was entitled to compensation under the Act for the damage sustained by its gas mains. Specifically, the Court had to determine whether the gas mains constituted "improvements" or "improvements to land" within the meaning of the Act, and whether the damage suffered by Jemena fell within the scope of compensable loss as defined by the legislation. This involved an examination of the statutory language and its application to underground infrastructure.

The High Court considered the definition of "improvements" in the Act, which included "any building or other erection on land". Their Honours concluded that Jemena's gas mains, being underground pipes laid for the conveyance of gas, did not constitute "improvements" or "improvements to land" as contemplated by the Act. The Court reasoned that the statutory language referred to structures erected on the surface of the land, not subterranean infrastructure. Consequently, Jemena's claim for compensation was not sustainable under the *Mine Subsidence Compensation Act 1961* (NSW).