ASX-listed Aura Energy has received the last outstanding material permit to allow the construction and operation of the Tiris uranium project from the Mauritanian government. The company says the  authorisation to develop, mine and produce uranium oxide concentrate (UOC) was issued by the National Authority for Radiation Protection, Safety and Nuclear Security – L’Autorité Nationale de Radioprotection de Sûreté et de Sécurité Nucléaire (ARSN) – on July 12.