Natural Resource Partners LP engages in the business of owning, managing, and leasing a diversified portfolio of mineral properties. It operates through the Coal Royalty and Other, and Soda Ash segments. The Coal Royalty and Other segment comprises of coal royalty properties and coal-related transportation and processing assets. The Soda Ash segment consists of non-controlling equity interest in a trona ore mining operation and soda ash refinery in the Green River Basin, Wyoming. The company was founded in April 2002 and is headquartered in Houston, TX.