Industrial mineral site no. 398, known as "Deposit 7" is a site in Okanogan County, Washington. This site has been associated with dolomite. A notation found in DGER Bulletin 37 on page 39 says "Triangular in outline. E. and W. sides 6,800 ft. long and S. side 1,600 ft. long", and designates the value as "Contains an estimated 176,000,000 tons. Undeveloped".