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Placer Platinum
June 2004 by Edgar B. Heylmun, PhD
The platinum group metals (PGMs) are divided into three that are “light,” about the same atomic weight as silver, and three that are “heavy,” about the same atomic weight as gold. The three light PGMs are ruthenium, rhodium, and palladium, and the three heavy PGMs are osmium, iridium, and platinum.21st Century American Gold Rush: Rare Earth Elements
The burning question I needed answered was why didn’t the deposit ever get mined of at least one of the valuable minerals? A couple of reasons have come to light.
Over the Divide
Charles L. Butler
1920 - 2014
Volume is the Key to Success
While recovery rates are important, they must necessarily be secondary to the volume of material processed. Running more material at lower recovery rates is generally preferable to increasing the efficiency of the system.
Mining Investment—Or Fraud?
The rapid fall of the stock market created a situation in which investors not only pulled back from traditional equities, assuming dot coms are traditional investments, but many recent arrivals in the world’s...
Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Where To Find Diamonds
Where to find diamonds in the United States: It is somewhat common for gold prospectors to find diamonds in black sand concentrates and not recognize them.
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The Bawl Mill
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• Zeballos Gold Camp, British Columbia
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• Oregon Dredgers Receive Threats From Environmentalists
• Understanding Hard Rock Mining: Terms and Methods—Part I
• Mood at Calgary Conference is Subdued, But Optomistic
• Reinventing the Wheel—The Infinity-Jet
• Company Notes
• Endangered Species Act is a Mess
• Here Come the MineBots
• Agency Gives Initial Backing to Kensington Mine
• Mining Stock Quotes and Mineral & Metal Prices
• Looking Back
• Melman on Gold & Silver
• Brits Thwart Robbery of Gold and Cash
