 Unimin has over 2,400 employees located in 19 states in the U.S., Canada and Mexico.Founded in 1970, Unimin is one of North America’s largest producers of non-metallic industrial minerals.Unimin is the world’s leading producer of quartz proppants (frac sand) and a major producer of resin coated sand proppants for oil and natural gas stimulation and recovery, and the largest producer of low-iron nepheline syenite for glass, ceramic, paint and plastic applications.