This is a placer-mining district in south-western Placer County, two miles east of Rocklin and two miles south of Loomis. A gravel channel of the Tertiary American River trends southwestward through the area. There are actually two channels: an upper loosely consolidated intervoleanic channel that contains some gold and a lower well-cemented quartz-rich channel that in places was rich. The lower gravels yielded $1 or more per yard in gold. The gold is fine, flat, and sometimes rusty. The lower channel is as much as 1500 feet wide. Bedrock is granodiorite, and in places the gravels are capped by andesite. The Lee drift mine, one of the principal sources of gold in the district, has been prospected in recent years.
Lindgren, Waldemar, 1894, Sacramento folio: U. S. Geol. Survey Geol. Atlas of the U.S., folio 5, 3 pp.
Lindgren, Waldemar, 1911, Tertiary channels of the Sierra Nevada: U.S. Geo1. Survey Prof. Paper 73, pp. 163-164.
Waring, C. A., 1919, Placer County, The Rocklin district: California Min. Bur. Rept. 15, p. 319.