Hetherington v Amalgamated Collieries of WA Ltd

The appellant, the widow of James Hetherington, sought compensation from the respondent, Amalgamated Collieries of W.A. Ltd., under the Workers' Compensation Act 1912-1934 (W.A.). Her claim arose from the death of her husband, a coal miner, who was found dead during his working hours in a mine roadway. The deceased suffered from advanced coronary arterio-sclerosis, and a post-mortem revealed that an occlusion of his coronary artery caused his death. The magistrate found that while the worker was likely to die at any time due to his disease, the exertion of his work and the conditions in the mine had contributed to hastening his death. The Full Court of the Supreme Court of Western Australia reversed this decision, finding no proof that the occlusion arose from the deceased's work. The widow appealed this reversal to the High Court.

The central legal issue before the High Court was whether the deceased's death constituted "personal injury by accident arising out of or in the course of his employment" within the meaning of section 6(1) of the Workers' Compensation Act. This required the court to determine if the exertion of the worker's ordinary duties, combined with his pre-existing disease, could be considered an accident, even in the absence of a specific, unusual incident. The court had to consider whether the employment was a contributing cause to the physiological injury that led to death.

The High Court, in allowing the appeal, reasoned that established principles from cases like *Fenton v. Thorley & Co. Ltd.* and *Clover Clayton & Co. Ltd. v. Hughes* indicated that an injury could be considered "by accident" if it was an untoward or unexpected event, even if it arose from the worker's ordinary work and was exacerbated by a pre-existing condition. The court adopted the principle that if the work done at or about the moment of a physiological injury contributes in any material degree to its occurrence, it is an injury by accident, even without evidence of strain or a specific cause other than ordinary work. The magistrate's finding that the exertion and conditions encountered by the deceased had hastened or contributed to his death was supported by evidence and was sufficient to establish that the employment was a contributing cause.

The High Court reversed the decision of the Supreme Court and restored the magistrate's order in favour of the appellant. The court held that the deceased had suffered personal injury by accident arising in the course of his employment, entitling his widow to compensation.