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Open-File Report 2011–1188

Prepared in cooperation with the California Geological Survey

California Geological Survey Map Sheet 59

Reported Historic Asbestos Mines, Historic Asbestos Prospects, and Other Natural Occurrences of Asbestos in California

By Bradley S. Van Gosen, U.S. Geological Survey, Denver, Colorado and John P. Clinkenbeard, California Geological Survey, Sacramento, California

Thumbnail of an asbestos mine and link to report PDFsAbstract

The map (Plate.pdf), pamphlet (Pamphlet.pdf), and the accompanying datasets in this report provide information for 290 sites in California where asbestos occurs in natural settings, using descriptions found in the geologic literature. Data on location, mineralogy, geology, and relevant literature for each asbestos site are provided. Using the map and digital data in this report, the user can examine the distribution of previously reported asbestos and their geological characteristics in California. This report is part of an ongoing study by the U.S. Geological Survey to identify and map sites where asbestos mineralization occurs in the United States, which includes similar maps and datasets of natural asbestos localities within the Eastern United States (, the Central United States (, the Rocky Mountain States (, the Southwestern United States (, and the Northwestern United States (Oregon and Washington) ( These reports are intended to provide State and local government agencies and other stakeholders with geologic information on reported asbestos mineralization in the United States.

First posted August 22, 2011

For additional information contact:

USGS Central Mineral and Environmental Resources Science Center
Box 25046, Mail Stop 973
Denver, CO 80225

Part of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Van Gosen, B.S., and Clinkenbeard, J.P., 2011, Reported historic asbestos mines, historic asbestos prospects, and other natural occurrences of asbestos in California: U.S. Geological Survey Open-File Report 2011–1188, 22 p., 1 pl.

Pamphlet Table of Contents

What is Asbestos?

Natural Occurrences of Asbestos in California

The Geology of Asbestos in California

Asbestos-Bearing Talc Deposits of the Southern Death Valley Region

Fibrous Amphiboles in California

History of Asbestos Discovery and Mining in California

Studies by the California Geological Survey of Natural Occurrences of Asbestos in California

Digital Datasets

References Cited

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