Local Meaford resident Trevor Hesselink never thought that his margin notes in an environmental reporting document would turn into an eight-year struggle for accountability in Ontario’s mining sector. But after months of painstaking research, publishing an exhaustive investigative report, and launching a private prosecution, Hesselink’s case against the diamond giant finally came to a successful resolution in the Timmins Ontario Court of Justice last week. De Beers Canada Inc. pleaded guilty to failing to provide mercury monitoring data relating to the operation of its Victor Diamond Mine in Northern Ontario.