McMahon v The Griffin Coal Mining Co Ltd

The applicant, McMahon, sought special leave to appeal to the High Court of Australia from a decision of the Full Court of the Supreme Court of Western Australia. The dispute concerned a claim for personal injuries sustained by McMahon during his employment at The Griffin Coal Mining Co Ltd. McMahon alleged he injured his left knee when he jumped from a utility vehicle onto uneven ground at the mine site.

The central legal issue before the High Court was whether the Full Court had erred in upholding the trial judge's findings of fact, particularly concerning the credibility of McMahon as a witness and the assessment of evidence regarding the cause of his injury. McMahon argued that the trial judge applied an incorrect legal standard by requiring proof that the injury did *not* occur during a badminton game, rather than considering whether the evidence raised a probability that it occurred at work. He contended that the Full Court should have critically analysed the remaining evidence after disregarding any potentially tainted by the trial judge's adverse assessment of his demeanour.

McMahon's submission was that the trial judge's reasoning was flawed because it placed an onus on the plaintiff to disprove alternative causes of injury, rather than on the defendant to establish them. He argued that the evidence presented, when properly considered, favoured the probability that the injury occurred at work, and that the Full Court should have intervened given this perceived departure from fundamental legal principles, drawing an analogy to the High Court's decision in *Goodwin's case*. The High Court, however, indicated that appeals based on findings of fact, particularly those involving witness credibility, are generally not granted special leave except in exceptional circumstances demonstrating a departure from fundamental principle.