R v Central Reference Board; Ex parte Thiess (Repairs) Pty Ltd

The case involved an application for prohibition by Thiess (Repairs) Pty Ltd against the Central Reference Board. The dispute arose when the Board ordered the reinstatement of an employee, Leon Anthony Belmar, who had been dismissed from his position as a fitter with Thiess (Repairs) Pty Ltd. The prosecutor argued that the Board lacked jurisdiction because Belmar was not employed in the coal-mining industry, and therefore the matter was outside the scope of the National Security (Coal Mining Industry Employment) Regulations under which the Board operated.

The legal issue before the High Court was whether the Central Reference Board had jurisdiction to make the reinstatement order. Specifically, the Court had to determine whether Thiess (Repairs) Pty Ltd, and by extension its employee Belmar, were engaged in the coal-mining industry for the purposes of the National Security (Coal Mining Industry Employment) Regulations. This involved considering the nature of the work performed by Thiess (Repairs) Pty Ltd, its relationship with Thiess Bros Pty Ltd (which conducted open-cut coal mining operations), and the definition of the "coal-mining industry" within the context of the regulations.

A majority of the High Court, comprising Latham C.J., Rich and Starke JJ., held that the Central Reference Board did not have jurisdiction. Their reasoning was that Thiess (Repairs) Pty Ltd was an engineering company whose principal business was the repair of machinery, and this work, even though it was predominantly for a coal-mining company, did not constitute engagement in the coal-mining industry itself. The Court distinguished between an industry and a business that provides services to that industry. While the repair work was essential for the coal-mining operations, the substantial character of the enterprise carried on by Thiess (Repairs) Pty Ltd was engineering, not coal mining. The Court also affirmed that Regulation 17 of the National Security (Coal Mining Industry Employment) Regulations, which purported to prevent challenge to the Board's orders, did not confer jurisdiction where none existed and did not preclude the High Court's power to issue prohibition under Section 75(v) of the Constitution.

The order nisi for prohibition was made absolute.