Achieving Accurate Metal Detector Discrimination
December 2019 by Chris Ralph
Your odds of going home with gold will be higher using the discrimination mode, even if you might have misread one of the targets you rejected.
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.
Exposed veins and outcroppings can be a great source for gathering good gold ore for processing. Veins and outcroppings do require a lot of work to free the ore from its earthen grip, but this labor can be very rewarding.
It’s accepted knowledge that wet methods will recover more fine gold than dry methods and processing the gravel as a whole will get more gold than only using a metal detector. The question is how much more?
In Chicken I had my first experience with the famous Alaska blue clay, sometimes called the blue layer. The blue layer is where the best fine gold was to be found.
We panned out maybe three gold pans of the material and we were shocked at the gold that was there. This rock appeared to be rich.
When prospecting for lithium, after confirming for macro attributes through research and field work, including examination of surface geology, the main tool is an accurate lithium assay.
I like to think in terms of “conductive mass” because it is a combination of both the conductivity of the metal and the size of the target that determine how a detector sees conductivity.
The Bawl Mill • Ask The Experts - How do I obtain a map of Montana gold & sapphire gravel bars? • Ask The Experts - How do I process this white quartz with black striations? • Ask The Experts - Does gravel + bedrock = gold? • Back to Green Valley--With A Sluice • A Lesson In Underwater Sniping • More Fiddling While Forests Burn • My New Passion--Crystal Hunting • The Half-Mile Claim • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices • Gold Prospecting for Better or Worse: White Knuckle Mining