In 1970, Anschutz bought the 250,000-acre (1,000 km²) Baughman Farms, one of the country's largest farming corporations, in Liberal, Kansas, for $10 million. The following year, he acquired 9 million acres (36,000 km²) along the Utah-Wyoming border. This produced his first fortune in the oil business. In the early 1980s, the Anschutz Ranch, with its billion-barrel (160,000,000 m³) oil pocket, became the largest oil field discovery in the United States since Prudhoe Bay in Alaska in 1968. In 1982 Anschutz sold an interest in it to Mobil Oil for $500 million.