Prospecting & Detecting
Piles of Gold
September 2015 by Ray Mills
These gritty clay lines were only a quarter of an inch up to three inches wide. Once the line had been laid out, they would look at the wall of gritty clay material and seek more indicators.
The Hunt for Remote Canyon Gold
A large, 8-pennyweight piece popped out of a very small crevice where the water had been extremely swift in the winter, leaving no visible gravel.
An Alaskan in the Lower 48
Our destination was some old hydraulic workings where the old miners had washed literally mountains of material away to expose gold in ancient river channels.
Panning on North Fork American Yields Good Gold
This second trip down was a challenge. It started in Colfax on the Stevens Trail, where the distance to the river is four miles with an elevation drop of about 1,000 feet.
Determining The Optimal Crushing Size for Gravity Recovery
It’s not easy to figure out what is best without testing, and so a certain level of confusion has developed about how small the ore ought to be crushed.
Ask The Experts
• Can I get advice on a hard rock property in Calaveras County, California?
Gold Detecting Strategies for Hydraulic Mines and Debris Flows
The old timers typically washed these areas down to bedrock, and some areas appear terraced. I would imagine this is because these hydraulic mines were generally where the miners found old Tertiary river channels on the sides of mountains that were gold-bearing.
Selenium, Mercury and Suction Dredging—Studies Contradict CA State Water Resources Board
Federal and state regulatory agencies often cite mercury and methyl mercury in our waterways as a major factor for further restrictions on placer mining, and on suction gold dredge mining, in particular. However, these regulatory agencies are minimizing selenium and its neutralizing effects.
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• Detecting Nuggets—Overcoming New Challenges
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• Retired Geologist Warned Public of Pending EPA Disaster
• AMRA Takes On USFS in Idaho
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• Two Men Claim Discovery of Nazi Treasure Train
• Melman on Gold & Silver
• Emergency Dredging Closures in Washington State
• More Gold Recovered Off Florida Coast
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