Small amounts of gold have been mined in the Shadow Mountains in northeastern San Bernardino County. Gold was discovered here in 1894, and there was some activity for a few years following. There are several quartz veins in granitic gneiss that are associated with aplitic dikes. The ore deposits contain nature gold and varying amounts of copper.
Crawford, J. J., Shadow Mountain district: California Min. Bur. Rept. 13, p.328.