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Historic Mining at Mount Diablo, CA
September 1999 by Richard H. Peterson, PhD
Located in Contra Costa County in the East Bay region of the San Francisco Bay Area, Mount Diablo was the site of the largest coal mining operation in the state in the last half of the nineteenth century. The northern foothills of the mountain produced nearly four million tons of coal.Proper Assaying of Placer Samples
The whole purpose of sampling mineralized ground is to measure the values in a small volume of material that would be representative of a much larger volume of similar material. The key word is representative. Chemical and fire assaying will not accurately represent placer deposits by themselves.
The Robinson Mine—Big Things Happen Here
When I’m traveling through the West, I sometimes take detours that lead me to places that I never knew exist
Mining Stock Quotes and Mineral & Metal Prices
Mining Stock Quotes and Mineral & Metal Prices
Picks & Pans: Miner Finds Heart of Gold
We started planning for this trip last year, after we left Ganes Creek, Alaska, and headed back to civilization. I found 4.75 ounces of very nice nuggets and the group had a total of 47.47 ounces for the week.
Mining Stock Quotes and Mineral & Metal Prices
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The Bawl Mill
• Over the Divide
• Our Readers Say
• Feds Eye Restrictions on AZ Archaeological Sites
• IMF Reconsidering Gold Sales to Finance Debt
• Governors Focus on Aid for Laid-off Miners
• Nevada Counties, Towns Get Forest Service Grants
• Labor Dept. Approves Aid to Laid-off Nevada Miners
• Company Notes
• ISEE Celebrates 25 Years
• Picks & Pans: Basic Dry Washing Operations in Gold Placer Mining
• Washington Miner Wins Poetry Contest
• Gold Coin Sales Boosted by Low Prices
• The Klamath Mountains
• Silver Posts Best Price in 11 Years—Strong Investment Interest and Steady Demand Cited
• Platinum—Group Metals
• Gold in the Drum Mountains
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
• Looking Back
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