Industrial mineral site no. 710, known as "Crumbacher Lake" is a site in Okanogan County, Washington. This site has been associated with marl. A notation found in DGER Bulletin 37 on page 58 says "Marl deposit 10 to 15 ft. Thick and covered by 1 to 3 ft. of overburden", and designates the value as "Worked at one time by Dan Graham".