Ask the Experts
April 2014 by Chris RalphBismuth oxide for assaying?
Q: Aside from the softness scratch test and other methods of identification, what feedback would you have on identifying gold in hard rock that may be mixed with other metals that affect its color?
The technology used in these devices has advanced greatly in the last century. Many different types of physical effects are used to measure these magnetic fields and we will briefly look at some of these.
There are not a lot of tools needed to get out and take advantage of the situation. Other than my wetsuit, I typically travel light with a gold pan, maybe a pry bar and a few crevice cleaning tools.
Take a look at the picture—it’s pretty simple and you can build it yourself.
Q: I am looking for a “trommel machine” that doesn’t separate anything but clay slurry from rock hard clay.
• How to find info on a particular mining claim
How do mines and refiners deal with doré bars?
The Bawl Mill • Ask the Experts • Ask the Experts • Ask the Experts • Ask the Experts • Ask the Experts • Mining for Gold and Sapphires in Montana • Contrary to Rumors, Couple Will Keep the Saddle Ridge Hoard • Finding Gold with a VLF Detector—Part I • Creating Your Own Luck • Over the Divide—Robert Michael “Mike” Corbley • Continuing Hard Rock Exploration • Recovering Fine Gold with Oleophilic Adhesion • Detecting for Gold in Nevada • Using Structural Clues to Locate Buried Placer Channels • Gold Deposits of the Ivory Coast • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices