Ask the Experts
May 2014 by Chris RalphSetting up a gravity dredge
Besides the EPA issue, our major priority is to work on the proposed amendment to the National Strategic and Critical Minerals Production Act (S 145), a bill proposed in the Senate by US Senator Dean Heller (R-Nevada).
I had my heart set on finding a large nugget on this trip, and it seemed to me that pounding known patches was not likely to turn up a monster. Inevitably I would spend at least half my day wandering off...
The design of metal detectors well-suited for prospecting is an interesting process and not necessarily an easy one to achieve. It is a combination that blends the desires of what prospectors would like, the requirements of sales people and dealers, with the science and physics of what the electronics can achieve.
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?
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.
Anyone who has found a patch knows the difficulties involved. Those who haven’t can guess, and with any effort will soon realize it.
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