A New Method for Handling Stubborn Gravity Middlings
July 2016 by Gavin & Randy ClarksonThe solution focused on the relative difference in malleability between gold and waste, rather than the difference in density exploited by gravity circuits.
In processing gold, silver and other valuable ores, the minerals containing the values, such as metallic gold, silver-bearing sulfides or other minerals, must be freed from the surrounding host rock before those valuable minerals can be captured.
My partner had the contacts and it wasn’t long before we had an agreement in place and the company had a geologist on site. I recall a time when he was getting the lay of the land, so to speak, and he broke off a rock sample and inspected it with his magnifier.
Everyone has heard of the golden beach at Nome, but Nome did not have the richest beach.
The excavator or backhoe has become the tool of choice for testing placer ground. These machines are the best way to explore and sample a placer deposit if the ground is not too wet or frozen and bedrock is not beyond the reach of the machine.
The biggest obstacle is that like many streams on the Kenai Peninsula, high water during the summer months from snow melt and rain can make dredging nearly impossible. The best dredging is in the colder months of the year.
Carbon, activated charcoal, or “char,” as some old timers refer to it, can be an assayer’s nightmare.
I had never run an impact mill before, but anything involving rocks, water and a big electric motor sounded great.
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