Industrial mineral site no. 1723, known as "Three Mile Creek Area" is a site in Pend Oreille County, Washington. This site has been associated with limestone and marble. A notation found in DGER Bulletin 48 on page 41-42 says "The limestone is gray, fine grained, and slightly argillaceous. Beds strike N. 13 degrees E. and are overturned toward the west so that they dip 70 degrees eastward beneath the older Maitlen Phyllite", and designates the value as "The analysis shows the rock to be a high-calcium limestone of exceptional purity, chemically suitable for sugar refining and the manufacture of pulp and paper, whiting, filer, and finishing lime".