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Wall-Rock Alteration
April 2004 by Edgar B. Heylmun, PhD
Wall-rock (country rock) alteration is found in all hard-rock mining districts and has been caused by hydrothermal solutions in the past history of the region. The zones of alteration have a bearing on where one might drill for ore bodies. The weekend prospector does not have the tools nor knowledge to block out ore deposits, but he can narrow down his search dramatically by understanding the zones of wall-rock alteration that he sees.Hidden Treasure Mine—Foresthill Divide, California
One of the greatest and richest underground placer mines of California was the Hidden Treasure Mine of Placer County.
Green Returns And Opportunity Is Almost Gone
Many of you have read recent articles that include pictures of some of the nice nuggets that have come out of this area. I’m going to talk very briefly about a few of my friends and some of the nuggets they have been taking out of this area…
The Bawl Mill
• He's got a real ball and chain...
• Knee-deep...
• Win a .357 Smith & Wesson?
Landowners See Potential Gold Mine in Uranium Ore
A group of Pittsylvania County landowners sitting on 92 million pounds of uranium ore wants Virginia to end its 25-year ban on uranium mining.
Mongolia Tax May Chase Off Investment
The gold and copper deposits at Oyu Tolgoi, or “Turquoise Hill,” are among the largest ever found and could give impoverished Mongolia its biggest boost since it abandoned communism 15 years ago—if the Mongolians can figure out how to profit from it.
Calcite and Limestone
The other distinguishing feature of calcite has to do with its chemistry. Geologists sometimes take a small bottle of dilute hydrochloric acid out into the field with them because calcite reacts with acids to make a bubbly foam.
Melman on Gold & Silver
Most American markets greeted the first few trading days of the new year with substantial selling. Compared to their 2004 year-end levels, by January 11, the Dow Jones Industrial Average had declined almost 300 points, the NASDAQ Composite had fallen from 2,185 to near 2,080 while the S&P 500 had dropped from 1,217 to 1,183.
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The Bawl Mill
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