Ask the Experts
September 2014 by Chris Ralph• Using drywashers to work desert gravels
Within a few minutes I got my first signal and dug out a small flake about three grains.
The type of mine dump that is best for metal detecting are the ones that consist of mixed sizes of rock and are located near some sort of excavation, commonly a shaft or adit. Sometimes the piles located along a trench dug by the miners can be productive as well.
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.
In some places valuable ores can be found within the waste material of mine dumps, sorted ore piles, and detrital vein matter at the surface. Though many of these old mine sites can be an excellent source of gold, not all are created equal.
I recently found myself wondering what would be the ultimate prospecting adventure. What would be the most amazing thing if I had no restrictions or limitations?
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.
On our fourth trip, we finally reached the top edge of the old hydraulic pit, and it was monstrous.
The Bawl Mill • Ask the Experts • Taking on the EPA, Sasquatch, Ratchilla and Gold Dredging • Gully Prospecting and Mining • Wilfley Tables—Repair, Rebuild & Set Up • 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