Gran Tierra Energy Inc. (Gran Tierra) is an independent international energy company engaged in oil and gas acquisition, exploration, development and production. Gran Tierra owns oil and gas properties in Colombia, Argentina, Peru and Brazil. During the year ended December 31, 2011, the Company focused on development of producing fields and generation of exploration prospects in Colombia, including the acquisition of three blocks in the Petrolifera acquisition and the acquisition of a working interest in the Llanos 22 Block. It delivers its oil to Ecopetrol S.A. (Ecopetrol) through its transportation facilities, which include pipelines, gathering systems and trucking. On March 18, 2011, the Company acquired of all the issued and outstanding common shares and warrants of Petrolifera Petroleum Limited (Petrolifera).