CGX Energy Inc. (CGX) and Frontera Energy Corporation (Frontera) have amended the letter agreement to extend the time by which CGX Resources Inc., a wholly owned subsidiary of CGX, and Frontera will enter into a farm-in joint venture agreement covering CGX's two shallow water offshore Petroleum Prospecting Licenses in Guyana, the Corentyne and Demerara Blocks as previously disclosed on December 4, 2018, to on or prior to February 6, 2019.