Mercer Caverns are located one mile north of Murphys in Calaveras County California. They are named after the gold prospector Walter J. Mercer who discovered the caves around 1885 and filed a claim. They were later renamed as caverns. The caverns have a large number of speleothems, stalactites, and stalagmites. Under the limestone calcite are a range of aragonite minerals that are pure CaCO3.
- Fife The Endless Adventure in the California Outback (2009), p. 191
- Mercer Caverns (Near Murphys, on Sheep Ranch Road, Calaveras County) Discovered by a gold prospector in 1885, who found no gold but did find human bones (four adults,one child, and one infant). — Mary Hill, in Geology of the Sierra Nevada: Revised Edition (2006), p. 159
- "Mercer Caverns". Retrieved 2007-03-28.
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