How To
Enrichment of Mineral Deposits by Weathering—Part I
March 2016 by Chris Ralph
The exact minerals formed in the concentrated supergene deposits depends much on the type of country rock around the deposit and the chemistry of the deposit itself, but if conditions are right, this process will form some rich patches of bonanza ore, in some places valued at thousands of dollars to the ton.
Care and Lubrication of a Model 13 Laboratory Wilfley Table
A Wilfley table works best when all of the mineral being run across it (the pulp) is about the same size. For this reason, I took a good look at each of the samples.
Tips & Tricks: How to Revive a Dredge Engine That’s Been Submerged
It rained over four inches that night and the creek flooded both my backyard and my workshop. When I opened the door to my workshop Christmas morning, an unwelcome sight greeted me.
All About Hard Rock Drills
There are three basic power sources for rock drills—electricity, gasoline and compressed air. Before we go into big pneumatic drills, we’ll start with a quick rundown of each.
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
How do I set up a small placer operation?
Finding Gold with a VLF Detector—Part II
It is this ability to hear and respond to the faintest of audio signals that I believe separates the best nugget hunters from everyone else.
Fine Gold Panning Without Using Mercury
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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