Ask the Experts
January 2015 by Chris Ralph• How do I clean up gold encrusted with iron-sulfides?
The excavator or backhoe has become the tool of choice for testing placer ground. These machines are the best way to explore and sample a placer deposit if the ground is not too wet or frozen and bedrock is not beyond the reach of the machine.
This is the point where you might ask, “What do these types of contracts typically look like and how are they negotiated?” Well, that is the topic of this month’s article.
Ore testing and other advice for starting up a mining operation.
Q: I am looking for a “trommel machine” that doesn’t separate anything but clay slurry from rock hard clay.
• Two questions: Is fool's gold magnetic? And how do you go about filing a miing claim?
The whole purpose of sampling mineralized ground is to measure the values in a small volume of material that would be representative of a much larger volume of similar material. The key word is representative. Chemical and fire assaying will not accurately represent placer deposits by themselves.
The technique I will describe is a much safer alternative and it works. It’s a fine-gold panning technique that eliminates the need for mercury amalgamation of most placer samples.
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