Thousands of workers continue striking at operations controlled by two of the world’s three biggest mining companies. In Canada, the United Steelworkers accused Rio Tinto of “major assault on workers and communities” as the UK-based giant planned for more contract labourers, allegedly at half the unionised rate. In Australia, around 3,500 workers at BHP Billiton’s coal mines in Queensland’s Bowen Basin announced a strike for better pay and conditions, starting this week.