De Beers shelves diamond mine expansion in northern Ontario after failing to win Attawapiskat’s support TORONTO – De Beers is shelving immediate plans to study an expansion project at a remote northern Ontario diamond mine after failing to get support from a neighbouring aboriginal community, a ‘disappointing’ setback for the world’s top diamond producer, the mine’s manager said. The isolated Victor mine in the James Bay lowlands produces some 600 carats of diamonds annually and is scheduled to stop production in late 2018 and close in early 2019, De Beers Canada general manager James Kirby told Reuters late last week.