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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.Alaska: Large-Scale Mining Can Be Done Right
"As elected leaders of the State of Alaska, we want you to know that Alaska is open to investment from those who seek to develop our state's natural resources safely and responsibly..."
43 CFR 3809 Final Rule
I’d like to send out a big “Thank You” to all of our readers who submitted comments regarding the proposed changes to the mining regulations. While we certainly didn’t get everything we asked for, we do have...
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Las Médulas—The Gem of the Roman Gold Mines
This mine was a real wonder of engineering, and the water supply and drifts had to be carefully managed to keep it in operation. In fact, it didn’t close due to lack of gold, but instead closed with the fall of the Roman Empire.
Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Pay Attention to the Features and Landmarks
People always ask me what is so important about locating contact zones. The answer to that: Gold.
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