Searles Valley Minerals Inc. is a raw materials mining and production company with corporate offices in Overland Park, Kansas. It is owned by the Indian company Nirma. It has major operations in the Searles Valley and in Trona, California where it is the town's largest employer. The company produces borax, boric acid, soda ash, salt cake, and salt. It also owns the Trona Railway. The Trona facility extracts and ships 1.75 million tons of chemicals per year.