Once I built a sluice to evaluate some concentrate from a copper mine.
I processed about 600 pounds of mud through the sluice and its density changed.
Going in it was about 11 pounds per gallon.
The weight of the intermediate concentrate after going through my sluice was 30 pounds per gallon.
It is wierd lifting up, heavier than it looks.
I paid one place to do a fire assay, and one other semi-retired geologist/ metallurgist volunteered to do
his standard battery of chemical assays.
Long story short, there's copper in the sand.
I may end up selling the sluice. It is 6 1/2 feet long and about 15 inches wide.
It didn't bring me good luck, but it helped me learn some mining.
I have a friend who does river mining, and he uses a metal detector to help him figure out where to dig. Then he goes in with a dredge and a sluice on a back pack, sets it all up, and processes 2 to 10 cubic yards of river sand. It will yield 1/4 ounce to an ounce plus, of gold, per outing (hard working bust your ass 4 to 8 hours).
Key to his process is his metal detector. He is not having good luck, he is performing journeyman geological and metallurgical analyses in the field ... and it all starts with his metal detector.
I asked him if I could rent it, but he said no. Other than that he is very helpful. I could understand not wanting to loan out a tool you depend on.
So what is a good kind of metal detector to get ?
I'm also curious about 'hot rocks', what a local mining supply lady calls 'false positives', e.g. the thing rings or responds, but it's iron or copper instead of silver or gold.
I have Limited Tolerance for Zero-Tolerance.
Stoned Thinking is my Specialty.