North Antelope Rochelle Mine
WEBThe Powder River Basin of Wyoming and Montana is the largest lowsulfur coal source in the US. Eight of the ten largest mines in the United States are loed in the basin. ... The average grade of the coal shipped from the mine is 8,800 British thermal units per pound (20,000 kJ/kg), % sulfur, % ash, and % sodium (of the ash), ...