The Tomtor mine is a large mine located in the Sakha Republic (Yakutia). Tomtor represents one of the largest phosphates reserve in Russia having estimated reserves of 500 million tonnes of ore grading 35% P<sub>2</sub>O<sub>5</sub>.
Tomtor contains one of the world's largest concentration of rare earth minerals, estimated to be as high as 14.5%. the field remains undeveloped.