Industrial mineral site no. 346, known as "Dia-Cousti-Lite deposit" is a site in Grant County, Washington. This site has been associated with diatomite. A notation found in DGER Bulletin 37 on page 36 says "Deposit from a few feet to 18 ft. thick contains an esti-mated 100,000 tons", and designates the value as "Formerly operated by Dia-Cousti-Lite Co., Quincy; now operated by the Quincy Corporation of New York".