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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.Researchers Trace History of Hope Diamond
Researchers using computer analysis have traced the origin of the famed Hope Diamond, concluding that it was cut from a larger stone that was once part of the crown jewels of France.
The Subsurface Suction Dredge
The problems of the submersible dredge tube are addressed by the subsurface dredge, where the enclosed sluice recovery tube is suspended from a flotation assembly...
How to Recognize Hard Rock Gold Ores
I regularly get inquiries along the line of: “Hey, I found this rock, and I think it might be gold ore. How can I tell?” Prospectors are always on the lookout for gold-bearing rocks that may be the source of any nearby placer gold.
California State and US National Panning Championships
On Labor Day weekend, September 1st and 2nd, two days of furious, almost non-stop panning went on.
"Gold" Coin Debuts
For the first time, the Sacagawea Golden Dollar changed hands, intermingling with scuffed quarters and nickels, setting itself apart with its golden hue.
Gold in the Slate Creek Basin
In some areas these channels were thousands of feet wide, and just figuring out where you are in some of these diggings is a challenge.
Oregon Dredgers Receive Threats From Environmentalists
Oregon dredgers have been receiving notices of intent to sue for violations of the Clean Water Act (CWA) from the Northwest Environmental Defense Center (NEDC).
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