These gentlemen have approached me twice about doing a demonstration of their product, and I must say I am not only impressed but a few hundred dollars richer from just 2 gallons of material that had already been panned, and I just classified it down to 20 micron and below.
The name of the company is goldstrikemicrongold.com. You can buy one of their machines or send them buckets of cons for them to process. The price is either 1/3 the gold recovered or $100 per 5 gallon bucket, or you can buy the machine for $600.
It has 6 valves or dumps, the last being waste and the first being the largest gold, each one down is finer and finer gold, not to mention the platinum and every other heavy metal. Out of the material I just normally throw away after going through panning, a gold screw, then followed by a black magic they were able to run 2 gallons of already run material and pull a few hundred in gold out of stuff I would normally pitch.
2 gallons usually takes me several hours to run, here in Colorado the gold is mostly so fine that a blue bowl and gold screw just don't work well and you lose more then half of your gold because it is so fine and flaky. Even the Black Magic floats it away. This is the first device I have ever seen that retrieves all your gold, down to 250 micron in size plus picks up Platinum. What would have taken me half a day they did in 40 minutes and retrieved what none of us can do with a pan, blue bowl, or even the finest gold screw.
Please just take a look, ask for a demo if in the area. I am not affiliated with this company in any way but am considering buying one for the club to save all of us time and money. IT WORKS LIKE NOTHING ELSE.