Understanding Rock Formations: Petrology for Prospectors
February 2021 by Chris Ralph
There are times when being able to recognize a type of rock can make you a much more successful prospector.
This is the story of a nugget patch I’ve been working on that is a bit unusual. I won’t be telling you where it is located, but I will tell you how I found it and how I’ve worked it.
Once a seam is found it can be traced for miles in either direction. While you are tracing a clay line, you are looking for indicators. The indicators that I look for are ironstone, hematite, different color clays intermingled with the clay line, and a very iron-rich, brown gritty soil.
...day one was like watching the Gold Rush television show. He furiously worked the nozzle in an up and down fashion that resembled Jack Hoffman sitting on a backhoe.
After burning more than 350 square miles, the Carr Fire near Redding, California, was finally out. Luckily our home was spared, and I had the opportunity to go metal detecting in burned areas previously too overgrown to access.
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.
Some gems can potentially poison you, make you sterile and even make you forget who you are.
Within a few minutes I got my first signal and dug out a small flake about three grains.
The Bawl Mill • Ask The Experts - Where did the gold go? • Ask The Experts - True north or magnetic north? • Ask The Experts - How do I avoid claim jumping? • Ask The Experts - Are closed placer and lode claims worth my time? • Gold Geochemistry: Where Does Gold Come From? • Goal Setting and Rock Tossing • Principles of Designing Your Mill Production System, Part II: Mill Design • Gold Prospecting for Better or Worse: A Claim to Die For • Tips and Tricks: How to Make Your Own Gold Bars Without Burning the Place Down • Minnesota Lawmakers Move to Stop New Mines • Drywashing for Desert Gold—Part I • Seven Troy Ounces of Premonition? • I Was Looking for Gold But I Found Jade • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices