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Used gold dredge8/25/2023 ![]() Assembly or disassembly takes about half an hour. Stainless bolts and Nylock nuts ensure the unit is easily pulled apart and moved or transported by one person when required. It is designed for ease of assembly and disassembly with quick release camlock fittings used on all pipes and hoses. It has been designed and built by an experienced professional gold dredger with over ten years of full time professional dredging experience behind him, but has only been run for a short period to ensure the unit works the way it should. One of the PVC floats is a reservoir for the air which ensures up to three divers never run out of air at any time even when working hard. Air is supplied to the divers via a hi performance oil less compressor equipped with a Teflon cup which delivers over 150 litres of air per minute. Two by three inch suctions complete with strainers ensure maximum flow is delivered to the venturis on the suction 6”suction nozzle as well as the venturi which sends the undersized material to the hydraulic riffles in the sluice box.Įxhausts are water cooled on the motors and exit into the water at the rear of the dredge making this a very quiet machine heard no more than 100 metres away from where the unit is operating. The unit is powered by twin 6.5 HP motors equipped with pumps capable of 60,000 litres per hour each. No blockages equals much higher performance and more fine gold being caught. It’s a completely block free system which ensures maximum through put of gravel. The six inch venturi power jet is fed by three 1” hi pressure nozzles set at 11 degrees and is tapered so the six inch suction hose fits inside the wider end and delivery from the power jet fits inside the flexible hose fitted to the sub surface classifier. This ensures the black sand and tin concentrates never compact thereby markedly increasing the fine gold retention under the black sands. Gravel is reduced down to 12 mm which means only the productive pay dirt is processed.įrom the subsurface classifier the 12mm undersize material is fed via a venturi jet to a small 250 mm wide sluice equipped with hydraulic riffles complete with pressure gauge so the optimum pressure is always maintained through the hydraulic riffles. ![]() This is a very powerful production unit designed to move large quantities of material through the sub surface classifier which is equipped with tapered grizzly bars to ensure no blockage takes place. "Six Inch High Performance Sub Surface Classified to 12mm - Gold Dredge. I don't know the dragon dredge but here is something similar: If getting gold on your claims is your goal and not the challenge of building and testing equipment for several months then I recommend buying a surface dredge. It is not that hard to get fine gold in a subsurface unit, but it is very hard to get it while trying to move the unwanted large material through. Building a subsurface that will capture fine gold is a tough job and requires the understanding that pressure drives the flow of water/material unlike a surface unit which benefits from gravity flow and angle to help move material over the sluice. This type of system has been deployed on surface designs also but does require considerably more design than a standard subsurface dredge. This type of system will achieve much better recovery than a standard submersible because the flow rate to move the smaller material is much less than the requires flow to move the large rocks. The sump is then run as a separate system with it's own suction jet drawing from the sump and feeding the sluicebox. I believe material is brought to a screen separator which allows the larger material to be discarded and the smaller material is caught below the screen in a sump. It was hard to see much of the "Dragon" on the show to give a good description, but from what I saw I think he is running a 2 stage system.
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