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Copperopolis, Foothill Copper Belt, Calaveras Co., California, USA

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From its beginnings in 1860 to the end of World War II, Copperopolis has been directly related to and affected by the extraction and production of copper ore. Copper was first discovered in the area in 1860 by Hiram Hughes on Gopher Ridge at Quail Hill, and a few months later at the Napoleon Mine on Hog Hill, about six miles southwest of Copperopolis. Shortly thereafter a copper-bearing “gossan” was discovered by W.K. Reed and Thomas McCarty in the Copper Cañon Mining District, on the Union Copper Claim, and a short time later a second strike was made on the Keystone Claim. Other important claims included the Calaveras and the Empire. One year later the community that developed around the strikes became known as Copperopolis, the name derived from the word “copper,” plus the Greek word “polis” meaning city.

Mineral List

Mineral list contains entries from the region specified including sub-localities

32 entries listed. 28 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 381.

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