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Ask The Experts: How to remove precious metals from lead?
August 2010 by Thom Seal, PhD, PE
I have a large amount of precious metals, gold and silver, mixed in with lead. Cupelling is expensive. What method can I use to extract the gold and silver without cupelling?Additional articles that might interest you...
The Business of Mining—Home Office Tax Deduction
November 2009
It is not just a few small-scale prospectors who use a home office. An increasing number of miners, prospectors, and mining-related business owners are operating at least a portion of their business from a home office.
It is not just a few small-scale prospectors who use a home office. An increasing number of miners, prospectors, and mining-related business owners are operating at least a portion of their business from a home office.
Oil Seeps in Arizona
December 2003
Compared to California, Arizona has virtually no oil seeps. But, the great Permian Basin of West Texas has virtually none either. Arizona has something that neither California nor Texas have, and that is public lands that are open for leasing. The northern half of Arizona has more seeps and is thus of greater interest, but it would be foolish to disregard the southern half because giant oil and natural gas fields could underlie some of the broad desert valleys.
Compared to California, Arizona has virtually no oil seeps. But, the great Permian Basin of West Texas has virtually none either. Arizona has something that neither California nor Texas have, and that is public lands that are open for leasing. The northern half of Arizona has more seeps and is thus of greater interest, but it would be foolish to disregard the southern half because giant oil and natural gas fields could underlie some of the broad desert valleys.
Federal Court to Address Dredge Permits—The Tulloch Rule
April 2006
Congress passed Section 404 of the Clean Water Act (CWA), which was originally called the Federal Water Pollution Control Act, 33 USC 1344, in 1972. Section 404 authorized the US Army Corps of Engineers (the Corps) to issue permits “for the discharge of dredged or fill material into the navigable waters at specified disposal sites.”
Congress passed Section 404 of the Clean Water Act (CWA), which was originally called the Federal Water Pollution Control Act, 33 USC 1344, in 1972. Section 404 authorized the US Army Corps of Engineers (the Corps) to issue permits “for the discharge of dredged or fill material into the navigable waters at specified disposal sites.”
Commercial Placer Mining With Jigs
August 2010
During the upward stroke, water is pushed up through the shot layer causing it to open up and lifting the gravel particles above. The heavier particles settle faster based on Stokes law, and move down into the shot bed layer, while the lighter...
During the upward stroke, water is pushed up through the shot layer causing it to open up and lifting the gravel particles above. The heavier particles settle faster based on Stokes law, and move down into the shot bed layer, while the lighter...
The Montanore Copper and Silver Project
June 2015
This adit will be nearly 3.5 miles long when it reaches the ore zone.
This adit will be nearly 3.5 miles long when it reaches the ore zone.
Ask The Experts
July 2015
Q: Is there a correlation between fault zones and mineralization of economic metals?
Q: Is there a correlation between fault zones and mineralization of economic metals?
Evaluating a Placer Discovery
March 2000
Gold mineralization is usually first noted in an area by examining material weathered from the source and liberated or washed downhill from it.
Gold mineralization is usually first noted in an area by examining material weathered from the source and liberated or washed downhill from it.
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