Industrial mineral site no. 320, known as "Nookachamp Creek" is a site in Skagit County, Washington. This site has been associated with diatomite. A notation found in DGER Bulletin 37 on page 35 says "A 6 to 12-ft. bed underlies 6 in. to 1 ft. of soil over an area of 15 to 20 acres", and designates the value as "Size sufficient for commercial operation".