Although the Mano River States (Liberia, Guinea and Sierra Leone) currently produce no Hydrocarbons, sporadic exploration activity is taking place. In 2005, Liberia held its first licensing round since the cessation of its civil war in 2003. Liberia awarded exploration concessions to UK-based Regal Petroleum, Repsol, Woodside, Broadway Consolidated and Oranto Petroleum. In addition, Canadian-based Ona Exploration signed a Memorandum of Understanding (MoU) with the Liberian government for Oil and Natural Gas drilling rights in two offshore concessions. In Guinea, Houstons HyperDynamics has been meeting with government officials to discuss hydrocarbon development plans in the country. The company has exploration and data marketing rights for the entire continental margin of Guinea, which covers 210 miles of coastline and up to 150 miles offshore. In October 2005, Sierra Leone signed an agreement with Nigerians oil and natural gas company, Frazimex, allowing the company to explore for oil in Block 3 for seven years. Several test wells drilled in the 1970s on Sierra Leones continental shelf produced shows of oil. To date, no proven hydrocarbon reserves have been found in Mali. However, many oil companies are currently exploring for oil, with focused exploration on the Taoudeni basin and the Graben de Gao in the northwest of the country. In Niger, the China National Petroleum Corporation (CNPC) is choosing three sites to drill exploration wells in its Tenere Block. CNPCs contract states that the drilling must be completed by 2008. In Petronas and ExxonMobils Agadem Block, the companies discovered an estimated 350 million barrels of oil equivalent. Oil exploration has been carried out for more than 20 years in Nigers Djado region on the border with Libya, but no commercial finds have been discovered.