Gran Tierra Energy Inc., an independent energy company, engages in the acquisition, exploration, development, and production of oil and gas properties in Colombia, Argentina, Peru, and Brazil. As of December 31, 2012, the company's acreage included 4.5 million gross acres covering 23 exploration and production contracts in Colombia; 1.3 million gross acres covering 11 exploration and production contracts in Argentina; 6.4 million gross acres covering 5 exploration licenses in Peru; and 0.4 million gross acres covering 5 exploration blocks in Brazil. It also had proved plus probable plus possible reserves of 86.3 million barrels of oil equivalent. The company was incorporated in 2003 and is headquartered in Calgary, Canada.