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The Other Minerals of Mt. Diablo
January 2000 by Richard H. Peterson, PhD
Although it is now known that Mount Diablo, located in Contra Costa County in the East Bay region of the San Francisco Bay Area, was the site of the largest coal mining operation in the state during the last half of the 19th century... this majestic focal point... also was the source of other minerals.Prospecting With a Detector: Lessons Learned
That is the course and intention for this article—to wander through some of the lessons I have learned in my thirty-two years of metal detecting and prospecting.
Flat-Fault Gold
Gold and other valuable metals are often deposited in breccia and rubble formed by flat or gently-dipping faults. Such faults are commonly found in areas of crustal stretching caused by the movement of tectonic plates. Flat-faults are especially common in southeast California, southern Arizona, and northern Sonora, Mexico. However, they can be present anywhere that crustal stretching has occurred.
Ask The Experts
• Is there a standard contract for placer mining to use with a private property owner?
Melman on Gold & Silver
Not being a psychiatrist, this writer is not aware of the specific term for a condition laymen refer to as “split personality.” However, whatever that term might be, it would be wholly appropriate for the news background during the past month. We were first subjected to one news story after another that suggested that our economic world was on a truly shaky foundation—and then, suddenly, we were “blessed” with a barrage of positive developments.
Clinton Declares Three More National Monuments
President Clinton took a helicopter tour of the Grand Canyon yesterday, then put his pen to paper to designate three more areas as national monuments and expand several others.
The Madonna Nugget
It was down deeper than I expected for surface trash. It wasn't until I was down six inches that the target screamed from my scoop.
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• Small Mine Selective Blasting
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• Sixteen to One Takes on MSHA
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• Mogollon—New Mexico's Remote Gold Camp
• ICMJ 9th Annual Photo Contest Results
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
• Looking Back
