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Gold at Ragged Top, Arizona
April 1999 by Edgar B. Heylmun, PhD
Ragged Top is a jagged mountain which rises to an elevation of 3,907 feet near the Silver Bell open-pit copper mine, some 34 airline miles northwest of downtown Tucson. It is an outlier of the Silver Bell Mountains...Gold in Gossan
Gossan is defined as being an iron-bearing capping over a sulfide deposit. It is formed by the oxidation and leaching of sulfide minerals, leaving hydrated iron oxides such as limonite and goethite, along with manganese oxides.
The Bawl Mill
• Let's see what goes on behind closed doors
• Nothing but the best, make that most expensive, for the US
• No exception for taxpayers
• Speaking of waste...
• Trimming the fat
• Uncle Sam needs you...to snitch!
Ask The Experts: Could you expand on your previous blasting article?
Q: Could you write more about the last two methods that you mentioned—the expanding chemical mixtures and the micro blasters, how and when to use them, and when not to use them?
Legislative and Regulatory Update
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Legislative and Regulatory Update
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All About Hard Rock Drills
There are three basic power sources for rock drills—electricity, gasoline and compressed air. Before we go into big pneumatic drills, we’ll start with a quick rundown of each.
The Bawl Mill
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• Don’t call us; we’ll call you...
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• Our Readers Say
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