Industrial mineral site no. 1530, known as "B & R Coal Co" is a site in King County, Washington. This site has been associated with sandstone. A notation found in DGER Bulletin 37 on page 122 says "Light-gray sandstone, containing 74.1 percent silica and 1.4 percent ferric oxide, fused at cone 8 minus", and designates the value as "Uncertain".