The Stonewall Jackson Mine, San Diego County, California
July 2001 by Richard H. Peterson, PhDFor obvious reasons southern California is not known historically for its gold mines. Gold production was concentrated heavily in the Sierra Nevada foothills in the northern part of the state. However, the high mountainous region of eastern San Diego County was the site of a number of productive hardrock gold mines, notably in the late 19th century.
Over 200 panners competed in this two-day event to decide who was the best of the best.
Contacts, faults and zones of weak rock are all places that can act as a pipeline to convey gold-bearing fluids, leading to valuable deposits.
Some scattered reports say that gold may have been washed from streams here as early as the 1840s, but the undisputed major discovery came in 1870.
The technology used in these devices has advanced greatly in the last century. Many different types of physical effects are used to measure these magnetic fields and we will briefly look at some of these.
After many decades of closures, land-use restrictions, and over-regulation, miners and all other public land users may finally see some real relief due to the efforts of MMAC.
There is one special picnic table I fervently wish I had kept. This special table was literally on top of the world. Better yet, it was on the mine dump of the old, long-abandoned gold mines at Summitville, Colorado.
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