Premier Magnesia, LLC is a global market leader in magnesia-based products and solutions for dozens of applications ranging from agricultural to industrial and environmental markets. We are one of the world's principal manufacturers and suppliers of high purity calcined magnesium oxide and magnesium hydroxide products. For over 50 years, the Company and its predecessors have owned and operated a magnesia mine and processing plant located in Gabbs, Nevada that will continue to offer the only domestically-mined source of magnesia ore in the United States well into the future.​Our Giles Chemical Division is the largest producer of magnesium sulfate, commonly known as Epsom Salt, in North America. Premier Magnesia and Giles Chemical are your essential magnesia mineral source, assuring consistent quality, technical expertise, and long term reliable supply.