Question: The Belle Ayr mine is a coal mine located 18 miles southeast of Gillette, Wyoming currently owned and operated by Alpha Natural Resources, a large American producer of metallurgical coal for the industrial production of steel and iron and low-sulfur thermal coal to fuel steam boilers for the production of what type of power?
{'answer': 'electrical', 'supporting_facts': [['Belle Ayr Mine', 0], ['Belle Ayr Mine', 3], ['Alpha Natural Resources', 0]]}