Industrial mineral site no. 1801, known as "Rosario Deposit" is a site in San Juan County, Washington. This site has been associated with limestone and marble. A notation found in DGER Bulletin 52 on page 195-196 says "The limestone bed is between 2 and 8 feet wide and pinches out at both ends", and designates the value as "The limestone is siliceous and slightly argillaceous".