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?
Fortunately, there are products on the market that can address these problems and make a small-scale mining operation feasible.
I could see lots of quartz, both loose on the hillsides and in the numerous small prospect diggings. There was a small gold rush here more than a century ago.
Setting up a gravity dredge
Some media outlets have speculated the hoard of coins came from a theft at the old US Mint in San Francisco that was reported in 1901.
There were iron stains all over and even a few places where I could see iron trash sticking out of the bedrock. These would be ideal spots to start with as the gold travels with the iron and lead.
Perhaps the most notable thing about skim placers is that they form on the top surface of gravel bars, as opposed to coarser gold placers where the weight of the gold particles allows the gold to settle down on or near bedrock.
The nugget was cast aside with larger rocks during the screening process, but it was found later by an employee...
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