Tri-Valley Corporation explores for and produces oil and natural gas in California. It has two exploration-stage gold properties and a calcium carbonate quarry in Alaska. The company also involves in drilling rig operations; operation of precious metal and industrial mineral prospects; and crude oil and natural gas drilling and development operations. As of December 31, 2009, Tri-Valley Corporations oil reserves included 3.0 million barrels of proved reserves, 0.8 million barrels of probable reserves, and 6.0 million barrels of possible reserves. The company was founded in 1971 and is headquartered in Bakersfield, California.