San Diego County is the twenty-third book in a series of books on Mines of the American West and the fourth on counties in California. This book contains over 1,350 entries covering mines, historic mining companies and associated lore in San Diego County. These include about 600 entries for Gold related properties, more than 150 entries for Gemstones of various types and more than 50 entries for Tungsten. The books are intended for the use of small miners, "rockhounds", metal-detector enthusiasts, hikers, campers, off-roaders and others. Modern GPS coordinates have been associated with most records to allow the reader to do a little "prospecting from their computer", using available on-line tools such as Google Earth. In this book a number of the locations have been reviewed using Google Earth and the results are included in a Comment section at the end of the entry. Tools like Google Earth allow the reader to pursue their interests and review locations when the weather is bad or they only have limited blocks of time. It also will allow the reader to maximize their use of time when they can physically visit the areas. Also, as a benefit to physical site visitors, many of the mines have been grouped by Mining District, where such existed.
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