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Discovery of the Mountain Pass REO Deposit
May 2001 by Edgar B. Heylmun, PhD
How does one go about discovering a rare earth oxide (REO) deposit when he is not familiar with the rare and unusual rocks and minerals that are found in such deposits? That was the case at Mountain Pass, California, yet the deposit was eventually discovered and mined.Ask The Experts
• Reason for adits rather than shafts?
Melman on Gold & Silver
There was certainly no shortage of attention-grabbing headlines during the past month. First we had the successful initiation of a recall election in California, followed by enormous increases in the price of gasoline in the USA and Canada, then both nations suffered through the worst power blackout in decades, and finally we are witnessing what appears to be the unraveling of the “road map” to peace in the Middle East.
Silver City Prospecting Adventures
I got to Silver City late on a Friday night (OK, it was 2:30am Saturday morning), and the first few snowflakes began to fall as I pulled into the campsite.
Residual, Lateritic and Gossan "Soils" as Potential Nuggetshooting Sites
Nearly everyone who has drywashed or metal detected for placer gold within hardrock gold-mining areas is aware of "residual placers" (a.k.a. seam diggin's)...
Our Readers Say
Letters from our readers...
• "...around forever..."
• "A decision I never regretted."
Broomstick Gold
We found a fairly large boulder nestled in the shoreline close to the campsite within a well-known gold drop zone. I thought that it possibly was laying on bedrock, and could very likely hide some gold. We were going to move it and have a look.
The Other Minerals of Mt. Diablo
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.
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The Bawl Mill
• Original Sixteen to One Goes to Court—Challenges MSHA Citations Part II
• The Golden Triangle of Sonora, Mexico
• Using Legal Subdivision
• Placer vs. Lode Gold
• Gold Tellurides: Tellurium, an Assay Impurity
• Court Hears Arguments Over Rights to Shipwreck
• Picks & Pans: How to Succeed in a Small Mine, A Case History: 1990-2000
• Charcoal Crucible Recipe
• Romance of the Old Silver King
• Record-Breaking Alaskan Nugget for Sale
• Company Notes
• Nevada Gold Production Up Despite Lower Prices
• Gold in Guatemala
• Bush Taps Utah Resident for Labor Post
• Looking Back
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
• Honda Pares Down Use of Precious Metals in Autos
