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.
The pit was a classic one—exposed shale bedrock with all the material being washed out one end of the pit. Within a few minutes I had a nice mellow signal that was in open ground.
Treasure hunters have been looking for the Lost Dutchman mine for more than a century.
Rocks and minerals associated with clay seam gold deposits in southern Oregon are often in sedimentary rock units at least partially metamorphosed into argillite. They are also associated with mafic volcanic rocks, basalts and gabbro that...
Q: How do I get gold out of a saturated solution of salt with nitric acid?
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Those who declared that our world would be forever changed after the events of September 11 certainly appear to have been right. Not only is the evening news filled with the events of the anti-terrorist war, but even our vocabulary has changed—along with our geographic knowledge. People who did not know Afghanistan from East Timor—and who could have cared less—can now recite at will facts about Kabul, Islamabad, Jalalabad and Uzbekistan.
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