American River Through Auburn (Northeast of)

American River (north side of), El Dorado County, California - the California Slate Quarry (From The Structural and Industrial Materials of California, Bulletin No. 38, California, State Mining Bureau, San Francisco, California, 1906.)

“California Slate Quarry, in Secs. 23 and 25, T. 11 N., R. 10 E., M. D. M.; F. S. Chadbourne, 121 New Montgomery street, San Francisco, owner. It is located on the north side of the American River. The material contains much iron pyrites. The trimmed slabs left in the yard are nearly all iron-stained, and some of them crumbling by the disintegration of the pyrite since their exposure to the air. The pyrite appears to be much worse on the west side of the quarry opening than on the east side. It is probably confined largely to certain layers of the slate, and the quarry opening unfortunately struck one of these bad streaks. The quarry has not been operated in the last few years.”
Auburn (south of), El Dorado County, California – Alabaster Cave Lime Quarry

Alabaster Cave Limestone Quarry – See Rattlesnake Bridge south of Auburn.
Auburn (northeast of), El Dorado County, California – California Rock and Gravel Company (Limestone) (Excerpts from "The Cool-Cave Valley Limestone Deposits, El Dorado and Placer Counties, California," by William B. Clark, Junior Mining Geologist, California Division of Mines, California Journal of Mines and Geology, Vol. 50, Nos. 3 and 4, July-October 1954, pp. 439-466. Used with permission, California Department of Conservation, California Geological Survey.)

California Rock and Gravel Co. – See Mountain Quarries for history and photographs of the quarries
Auburn, El Dorado County, California – Cool Cave Valley Quarries
(Cool Cave Valley Quarries - See: Cool Cave Valley quarries section.)

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