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The United States continues to be the world’s leading producer and consumer of diatomite. Production of diatomite in the United States during 2012 was estimated to be 820 kt (903,000 st), a slight increase compared with 2011 production. The unit value of diatomite varied widely by end use in 2012. Diatomite used as a lightweight aggregate was priced at $11/t ($9.98/st), while specialty-grade diatomite, used in art supplies, cosmetics, or biomedical applications, could be priced as high as $10,000/t ($9,000/st). Filter-grade diatomite had an average unit value of $330/t ($299/st). Seven companies operated 10 mines and nine processing facilities in California, Nevada, Oregon and Washington. U.S. diatomite exports totaled about 96 kt (106,000 st). Imports were much lower at approximately 3.07 kt (3,380 st).