Riffle Wikipedia

A riffle is a shallow landform in a flowing channel and it has specific topographic sedimentary and hydraulic indicators These are almost always assessed at a very low discharge compared to the flow that fills the channel approximately 10–20 and as a result the water moving over a riffle appears shallow and fast with a wavy disturbed water surface

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Hydraulic riffles were first developed in New Zealand as far as I know I first encountered them on a floating wash plant when I was doing a job there in 1989 Hydraulic riffles are a system of riffles that have a built in manifold that injects water into the gold recovery mats and fluidizes the gravel that is retained in a specially designed deep riffle system for a fluidized bed that

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How to design hydraulic riffles sluices Gold Dredging Forum

Mar 14 2013· How to design hydraulic riffles sluices I have a simple fluid bed sluice plan but some information is missing The design has 3 pipes across the fluid bed Each pipe has two rows of holes The outside diameter of the tubues is 3 4 The hidraulic riffles need 5 GPM of water and 3 6 psi

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For fine gold recovery the use of riffles can actually be a negative design element and most boxes specifically built for this type of gold don t use any type of riffle system Good examples of this box type are the DFS Damn Fine Sluice and Steve Gaber s Pop and Son Sluice

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when purchasing any type of gold recovery equipment Processing rate thr ough put Accuracy of gold recovery for given processing rate Recovery style gravity hydraulic vortice etc Durability longevity of unit Resistance to riffle scouring C lassification size metho d Type size of material feed system hopper etc you are wanting

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Feb 07 2018· I like the drop riffle sluices and have built a number of them over the years They are very efficient and easy to build I continue to make changes to them to try to improve on the design and run

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2 Large drop centre and friction type surface help make separation of gold easier 3 Light in weight convenient to use and carry 4 Use is not restricted as long as there is water available 5 It is especially suitable for use in mountainous areas rivers creeks and other places where electricity is inconvenient and transportation is

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Dec 03 2009· The inclusion of hydraulic riffles on a dredge is the main way known to professional Kiwi dredgers to dramatically improve fine gold recovery when dredging in areas of abundant heavy black sands However hydraulic riffles are not a practical option to use on a portable dredge as the design would be complicated and the whole dredge would have to

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Since the majority of the available gold in the world is micro fine and ultrafine gold in the 30 micron 0011 inch range you want a sluice that can collect that gold and keep it from running out the end The Gold Well Vortex Drop Riffle Sluice works by creating a gentle vertically oriented vortex This vortex keeps material in the spiral

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Hydraulic riffles like any recovery system has its strengths and weaknesses pros and cons Hydraulic riffles are among the more complex riffle types out there There are a number of design factors to consider such as riffle size geometry spacing water pressure aperture size and spacing etc

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Rifles are typically available to the civilian market in several different actions Single shot bolt action lever action pump action and semi automatic

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