Gwin Mine, Paloma, and Lower Rich Gulch were mined for placer in 1849. Quartz was discovered by J. Alexander in 1851. Property acquired by Wm. M. Gwin, California's first U.S. Senator, in 1851. The Gwin Mine closed, in 1908, yielded millions.

Marker is at the intersection of Paloma Road and Edster Street, on the right when traveling south on Paloma Road.

Courtesy hmdb.org

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