The Bureau of Land Management, an agency within the United States Department of the Interior, administers more than 250 million surface acres of America's public lands, located primarily in nearly 15 Western states. The agency sustains the health, diversity and productivity of the public lands for the use and enjoyment of present and future generations. The agency also manages an additional 300 million acres of below ground mineral estate located throughout the country. It maintains cadastral survey and historical data on lands patented, along with information on the mineral estate, resource conditions and permits or leases on federal lands. Bureau of Land Management is also responsible for maintaining viable national policies and processes for solid minerals resources under federal jurisdiction. Solid minerals include coal and non-energy leasable minerals, hardrock minerals on acquired lands, locatable minerals and salable minerals. Headquartered in Washington, D.C., the agency has a location in Boise, Idaho.