Handling Improvements with Trona Ore at FMC Wyoming FMC Wyoming - Green River, Wyoming The Need The world’s largest known source of natural sodium carbonate (trona) lies in the Green River formation in southwest Wyoming. FMC Wyoming is the largest of four companies operating in the region, which together mine roughly 15,000,000 metric tons of trona each year and produce over 8,000,000 metric tons of soda ash, which is roughly 80% of the soda ash produced worldwide from natural sodium carbonate. The primary deposits in the Green River formation are found at depths of 400 to 3,500 feet in beds that range from 4 to 12 feet in thickness. Approximately 500 square miles of deposits contain high quality ore, but occasional pockets of insoluble impurities are common even in high quality ore depo

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