hallador energy company, through its subsidiaries, engages in the mining, production, and sale of steam coal for the electric power generation industry in the united states. the company holds interests in the oaktown 1 mine underground mine located in knox county, indiana; the oaktown 2 mine located in knox county, indiana and lawrence county, illinois; carlisle underground coal mine located near the town of carlisle, indiana; and ace in the hole mine located near clay city, indiana. it is also involved in gas exploration activities in indiana. the company was founded in 1949 and is headquartered in terre haute, indiana.