Here's My Take On Drop Riffle Units/Battery Operated Highbankers After 3 Years

John-Edmonton

Silver Member
Mar 21, 2005
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Canada
Detector(s) used
Garrett- Master Hunter CX,Infinium, 1350, 2500, ACE 150-water converted 250, GTA 500,1500 Scorpion, AT Pro
A couple of things to bring to your attention. Drop riffle highbankers require less water flow then your standard riffles. Drop riffles allow the gold to drop out of the water flow, like it happens in nature. Standard riffles require more water flow, to create a low pressure zone, hopefully capturing gold. Larger stones can knock flour gold out of standard riffles, but just roll over drop riffles, where the gold has already dropped out of sight. Because of less water flow, drop riffles run very well on bilge pumps. The California Mini runs nicely using a 1100 gallons per hour pump. The Geo Sluice runs well on a 2000 gallons per hour pump.
12 volt lithium ion batteries are really coming down in prices, and bilge pumps are not a great expense. The lithium ion batteries can purchaced on Amazon or Ebay.
I did the math and pricing for running either the Californiaa Mini or the Geo Highbanker with different batteries. You could also run a 6" standard riffle unit on a 1100gallons per hour unit. These are in Canadian prices. US prices will be less.
Using a bilge pump is quiet, no gasoline, no oil, no tune-ups, no oil changes and the whole complete system is so light that you can carry it on your back and go just about anywhere. And drop riffles have excellent retention rates for flour gold.

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Below is a comparison about lead battery's vs. Lithium Ion Batteries. The talk about E-bikes, as the batteries also run a motor like a bilge pump.
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And, the retention rate is so good for flour gold. Below is an actual comparison using the eye of a sewing needle and size of gold caught in the riffles.
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