The Other Minerals of Mt. Diablo
January 2000 by Richard H. Peterson, PhDAlthough 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.
California Wilderness Coalition and The Nature Conservancy Recruit Government Employees to Carry Out Huge Land Grab
US Geological Survey, US Forest Service, Bureau of Land Management, and California State Employees Attend Environmental Extremist Conference.
The known iolite deposits are accessed at Palmer Canyon and Grizzly Creek in the central Laramie Mountains 15 to 18 miles west of Wheatland and 60 to 70 miles northwest of Cheyenne.
A number of crevices were still waiting to be cleaned out. A lot of the gold remaining in the pit was very fine sized, but a few small nuggets were also recovered.
Even with my favorite top-of-the-line gold detector there were several false digs. Many of the hot rocks gave a solid signal that was too much like a nugget to ignore. After trying several tests I just dug everything because it is better to be safe than leave a big, deep nugget for a more diligent gold hunter.
As we approached the river the view was outstanding and the sight was encouraging. A ravine coming down on the right side had been worked heavily, with rock piled back on each side. That surely meant there was gold somewhere close.
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If developed with metal detecting in mind, this virgin ground could be a bonanza for nugget hunting.
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