Industrial mineral site no. 1909, known as "Skagit Limestone Deposit" is a site in Skagit County, Washington. This site has been associated with limestone and marble. A notation found in unpublished material says "There is every indication that the limestone of this deposit is of a very good grade and acceptable for the manufacture of Portland Cement", and designates the value as "The surface exposures of this deposit indicate that a probable 400,000 tons of good quality limestone can be extracted therefrom, by open quarrying, and delivered to the railroad at Rockport, Washington for about $1.35 per rock ton".