of Quartz Gold in California
California State Historical Landmark #297
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This plaque is located at the southwest corner of Jenkins Streets and Hocking Avenue, Grass Valley, California. There are 20 other California State Historical Landmarks in Nevada County. The GPS coordinates for this location are N 39° 12.760 W 121° 04.302.
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This tablet commemorates the discovery of gold-bearing quartz and the beginning of quartz mining in California. The discovery was made on Gold Hill by George Knight in October 1850. The occurrence of gold-bearing quartz was undoubtedly noted here and elsewhere about the same time or even earlier, but this discovery created the great excitement that started the development of quartz mining into a great industry. The Gold Hill Mine is credited with a total production of $4,000,000 between 1850 and 1857.