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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.Fabled 1933 Gold Coin Up For Sale
A 1933 Double Eagle gold coin that never went into circulation—but triggered decades of intrigue—is being sold by the federal government at auction this summer. Experts predict it could sell for millions.
Placer Channel Sampling
Sampling gold placers can be rewarding, but remember to treat the samples so you are not high grading or low grading your results. Learn the rules and apply them so your samples are accurate.
Ask the Experts—What is barite used for?
Q: Could you inform me as to what “barite” is used for? Where can I locate a company that mines barite?
Prospecting With a Magnetometer
Swedes were the first to note variations in the Earth's magnetic field, circa 1640, and they were the first to use the dip needle. They made the first magnetometer in 1870.
Mines and Money
The “Mines and Money” gathering, held in Vancouver, BC, on May 20-21, was geared toward the upper levels of world mining executives. As such, the presentations were of a different nature than any of the gatherings covered in our publication earlier this year.
Piles of Gold
These gritty clay lines were only a quarter of an inch up to three inches wide. Once the line had been laid out, they would look at the wall of gritty clay material and seek more indicators.
How to Make a Rock Sled for Dredging
When my “anonymous” friend told me the rock tub was probably a hundred miles from where he safely stashed it, I decided to build another sled and improve on my old design.
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The Bawl Mill
• Over the Divide
• Our Readers Say
• Letter from the Editor to our Readers and Advertisers
• Administration Considers Bypassing Congress
• First Woman to Draw Mining Pension
• Small Mine Selective Blasting
• Mohave Mountain Placers, Arizona
• High Court to Reconsider Wilderness Water Rights
• Sixteen to One Takes on MSHA
• Picks & Pans: Gold Mining on Joie Osgood Ranch
• Gold
• Company Notes
• Millie's Tailings
• Placer PGMs in Alaska
• 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
