Old Eureka Mine, Central Eureka Mine, Sutter Creek, Jackson-Plymouth Mining District, Amador County, California, USA
Gold crystals (mounted as a pin) Ex. Gil Benoit Collection #1934 Doug Scott Collection
© JRMontgomery
Surface workings and old headframe of the Old Eureka Mine, c. 1920. Photo from Engineering & Mining Journal, 1920. (Internet Archive Public Domain photo).