1/13/2024 0 Comments Grass valley california mapThe gold-quartz mines of the Grass Valley-Nevada City district in Nevada County have been the most productive in the State, and the Empire mine in the same district was in continuous operation from 1850 to 1940, which at that time was the longest period of operation for any gold mine in the country (Logan, 1941, p. BERGENDAHL - USGS 1968Ĭlick here for the Principle Gold Producing Districts of the United States Index
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