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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.Mining Stock Quotes and Mineral & Metal Prices
Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Options Narrowed for Managing Chugach National Forest
Planners are narrowing their options for managing the 5.3 million-acre area Chugach National Forest.
A Guide to Overlooked Gold Deposits—Part III
Most of the old large gold dredging operations used a trommel. The trommel consisted of a long metal cylinder made of heavy punch plate in which the small gravel, black sands, and gold would fall though holes and end up in banks of sluices.
The Bawl Mill
• Greenpeace goes down with the ship...
• Airing your dirty laundry...
The Bawl Mill
• Feeding at the government trough
• Environmental group tops the US domestic terroritst list
• Some towns will do anything for tourism...
The Essentials of Dry Washing
Most dry washers have a feed rate adjustment. It needs to be set so that the material flows evenly over the riffles and does not bury them.
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The Bawl Mill
• Higher Copper Price Brings Hope, Jobs
• Zeballos Gold Camp, British Columbia
• Agreement Allows Pogo Mine to Resume Construction
• Treasure Hawk Mine Back in Action
• 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
