Hard Rock 101: Breaking Rock—Part I
May 2020 by John Norman
What do you do when you’ve located a promising deposit of gold or gemstones, but it’s trapped in solid rock?
If you do the math, it equates to about $1,500 of heavy metal value per three-hour dive. This is good wages, and you are doing a service to the environment by removing this toxic metal.
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.
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.
Chances are better that both types of gold did not come from the same source. Let's look at the probable conditions to cause two types of gold in a placer.
Digging in the right spots will produce excellent results, like this group of nuggets taken by the author while metal detecting during the last few months. The biggest nugget is over an ounce.
When it was all setup and running, you had everything coming off the dredge riffles into the boil box. At the hole section, some of the water got sucked down and pulled a lot of black sand and over heavies…
These are just some of the ways I have been able to find new spots to metal detect for gold.
The Bawl Mill • Ask The Experts - What does a prospector look for when seeking ores? • Ask The Experts - Is a detector any good at discriminating pyrite or chalcopyrite in ferrous-reject mode? • Ask The Experts - Does the Journal know if any gold mining has been shut down over the Covid-19 virus? • Ask The Experts - Is this a promising assay? • Ask The Experts - How do you utilize magnets in your prospecting equipment? • Ask The Experts - Is using hydrogen peroxide a good indicator for PGMs? • A Note from the Editor • Going Over Old Ground With Newer Technology • Tips and Tricks • Prospecting in the Age of Covid-19 • Sharing Gold Fever with a Friend • Panning on North Fork American Yields Good Gold • Gold Prospecting for Better or Worse: Dum-Dum Dodges a Boom-Boom • 'Wormholes'—Reckless Adventure • All About Lead Minerals, Silver and Gold • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices