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California’s streets paved of gold? Gold is the most famous and probably the most influential mineral found in California. First discovered at Sutter’s Mill in Coloma in 1848, the mineral sparked the Gold Rush of 1849 in California bringing droves of fortune seekers to the state. The population expanded rapidly—in San Francisco alone it increased from 1,000 in 1848 to over 20,000 by 1850. #ILoveYouCA Gold Au Amador County and Tuolomne County CAS 17, 19.2, 19.3 L2015.0708.052, 054, .055 This image was posted on October 09, 2015.