Wilfley Tables—Repair, Rebuild & Set Up
September 2014 by Roger NeuschelerI researched the Internet and found a number of table makers, but technology has changed in the last 25 years. No one could sell me a kit for a new deck with wooden riffles...
I thought it might be worthwhile to take a look at the basics of this important mineral separation technique and how a miner can use it to recover the values out of an ore.
My partner had the contacts and it wasn’t long before we had an agreement in place and the company had a geologist on site. I recall a time when he was getting the lay of the land, so to speak, and he broke off a rock sample and inspected it with his magnifier.
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.
Because quartz and gold may be deposited together across a considerable range of temperatures, not all quartz veins are the same, and there are several different types of gold-quartz deposits.
The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.
Each specimen is carefully examined to determine if it would be beneficial or not to use an acid treatment to reveal more of the gold.
The Bawl Mill • Ask the Experts • Ask the Experts • Taking on the EPA, Sasquatch, Ratchilla and Gold Dredging • Gully Prospecting and Mining • Designing and Evaluating Placer Gold Recovery Plants • Finding Streams of Gold • This is Why You Check Your Tailings • Lode or Placer: What Difference Does It Make? • New Rules to Impact the Lease/Buy Decision • There's a First Time for Everyone • Appeals Court OKs Permits for Upper Peninsula Mine • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices