That's A lot of blind faith you got in the corporations that make sluice boxes there Goldwasher
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Let me tell you what really happens. The first 4 or 5 shovels it does what it is suppose to do with the little particles dancing behind the riffles. Then the black sand and the heavys pack up behinds those riffles. After that All fine gold is swept out. They know this but sell them anyway!!!! Dave McCracken and other pros know this as well and spent large sums of money developing oscillating sluices, pulse jigs and the like trying to save that lost gold!!! How bad is the problem? Well McCracken found that if he got $1000 in his box, he threw out $8000 that same day!!!!! That is a right pricy piece of equipment that looses you $240,000 a month!!!!! They finally solved it with a centrifigual concentrator that caught gold down to 300 mesh. That also allowed them to work deposits that otherwise wouldn't pay. That was back in the 80s! You seen one on the market here? Not likely to either as they don't want you mining. They won't even sell you a decent gold pan. The super sluice is the best they offer. But a batea? Try to buy one in the US. Why won't they sell you one? Because they work!! Now if you got confidence in your sluice that it doesn't loose fine gold, wonderful! The rest of you better pan your tailings! As to the oldtimers, they were using quicksilver here (Georgia) in the 1820s. 40 years before they went to California!!! California and Nevada is full of cinibar. Why are all those old cinibar mines still listed if only the Chinese were using mercury? What was the point of hunting and mining cinibar if only a few Chinese were interested in it? The old timers used it in their pans, their sluices, and their stamp mills. If you don't like mercury, that is perfectly alright. That sluice is not going to capture any fine gold where you would need it anyway