US-based mineral exploration company High Power Exploration (HPX) has signed a letter of intent with the Liberian government and pan-African investment group Guma Africa to negotiate the ownership, design, financing, development, and operation of the Liberty Corridor. The Liberty Corridor is intended to be a multi-user infrastructure corridor connecting Guinea and Liberia, which will include a new railroad from Guinea’s mining-rich Nimba region to a deepwater port in Liberia, alongside an extension of the hydropower network from Côte d’Ivoire into the Nimba districts. It is estimated to cost b…