Another black day for China’s deadly coal mines. More than 40 miners have died and dozens remain trapped following a pre-dawn blast at a mine in Gujiao City in Shanxi province. Xinhua reports that 340 miners had escaped but some were badly hurt. Despite efforts to improve safety, China’s mining industry remains the world’s deadliest. Those efforts have concentrated on cracking down on and shutting down small operators, but this accident occurred at mine owned by Shanxi Jiaomei Group, the country’s largest producer of coking coal and which runs more than two dozen mines.