California State Historical Landmark #298
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This site is located at the Empire Mine State Historic Park, 10791 Empire Street, 1.2 miles east of Grass Valley, California. There are 20 other California State Historical Landmarks in Nevada County. The GPS coordinates for this location are N 39° 12.423 W 121° 02.807.
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The Empire Mine was originally located by George D. Roberts in October 1850. In the spring of 1854, the Empire Mining Company was incorporated and in 1865 new works, including a 30-stamp mill, were erected. In 1869 Wm. B. Bourn, Sr. purchased the Empire, when he died, Wm. B. Bourn, Jr. took over its management. The Empire was in constant operation from 1850 to the late 1950s.