Natural Resource Partners L.P.

Natural Resource Partners owns a 49 percent interest in Sisecam Wyoming LLC, the operator of a trona ore mining operation and a soda ash refinery in the Green River Basin of Wyoming.

Sisecam Wyoming is one of the largest and lowest cost producers of soda ash in the world. Trona, a naturally occurring soft mineral is processed into soda ash, which is used in a variety of consumer goods, including glass (48%), chemicals (30%), soap (5%), and paper. Soda ash consumption tends to increase in proportion to population and gross domestic product growth rates.

The Green River Basin in Wyoming holds the largest and one of the highest purity known deposits of trona ore in the world. Based upon current production rates and proven and probable reserves reported by Sisecam, the reserve life of Sisecam Wyoming LLC assets is over 50 years.