Natural Deposits
Trona is found at Owens Lake and Searles Lake, California; the Green River Formation of Wyoming and Utah; the Makgadikgadi Pans in Botswana and in the Nile Valley in Egypt. The trona near Green River, Wyoming is the largest known deposit in the world and lies in layered evaporite deposits from 800 to 1,600 feet (240 to 490 m) below ground, where the trona was deposited in a lake during the Paleogene period. Trona has also been mined at Lake Magadi in the Kenyan Rift Valley for nearly 100 years, and occurs in 'salt' pans in the Etosha National Park in Namibia.
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