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The Magazine: February 2011 (Vol. 80, No. 6)
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February 2011 (Vol. 80, No. 6)

Table of Contents

The Bawl Mill
• Unsustainable is an understatement
• Famous last words...
• Their good deed did not go unnoticed
• Truth in Advertising

by Staff
Our Readers Say
by Staff
The Basics of Crushing and Milling Operations
In processing gold, silver and other valuable ores, the minerals containing the values, such as metallic gold, silver-bearing sulfides or other minerals, must be freed from the surrounding host rock before those valuable minerals can be captured.
by Chris Ralph
Ask The Experts—What minerals are magnetic? Can rare earth magnets capture platinum?
What minerals are magnetic? I have heard that super magnets (rare earth magnets) can capture platinum. True?
by Chris Ralph
Ask The Experts—Jet nozzle or suction nozzle? Which is best for my highbanker?
I have a highbanker, and I am considering adding a suction piece to make it a combo.
by Chris Ralph
Ask The Experts—Precious metals in water?
How can I determine if there are precious metals in the groundwater?
by Chris Ralph
Rediscovering Placerville, California
Several areas came to mind, but each was eliminated for one reason or another. One that seemed to be hanging on was the old historic mining town called Placerville.
by Don Robinson
Eastern Arizona: Gold and Base Metal Deposits—Part I
Arizona is well-known for its copper-gold porphyries and massive base metal-gold sulfide deposits such that primary gold deposits in the state are often overshadowed.
by W. Dan Hausel
Over The Divide—Daryl J. Nelson
We were very sad to learn that Darryl J. Nelson, long-time owner and operator of Reno Prospectors Supply in Reno, Nevada, died December 18, 2010...
by Staff
Mud Men: Pocket Miners of Southwest Oregon—Part I
Rocks and minerals associated with clay seam gold deposits in southern Oregon are often in sedimentary rock units at least partially metamorphosed into argillite. They are also associated with mafic volcanic rocks, basalts and gabbro that...
by Tom Bohmker
Legislative and Regulatory Update
• Backdoor Wild Lands order
• PLP reports on latest dredge lawsuit
• Massive lands bill avoided
• No cap and trade for now
• RS-2477 rights affirmed
by Scott Harn
Cyanide-Free Gold Separation
Some ores—mostly those with a high free gold content—are very amenable to gravity concentration. Well oxidized ores containing coarse gold are usually best for non-cyanide processes. Ores with significant sulfide content may require the...
by Chris Ralph
Mining Stock Quotes & Mineral and Metal Prices
by Staff
Melman on Gold & Silver
I hope long-term readers would agree that while your columnist does occasionally carry some arguments to an extreme length, I usually stay within the bounds of reason. I am pointing this out because I was struck by an economic vision a few days ago that could test those bounds.
by Leonard Melman

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