If you want to learn more about how suction dredges work and how they find gold, check out our infographic below. It also requires a large investment upfront, with the cost of equipment averaging several thousand dollars. The process involves hauling heavy equipment, lifting and moving stones too wide for the suction nozzle, fighting against the water’s current, and lots of swimming. While it may sound easy, suction dredging is much more difficult than vacuuming coins out of your couch cushions (or gold flakes out of your carpeting). In a way, the process is like a combination of the best parts of gold panning and gold dredging. The 3D printed reduction/injection insert piece has a final reduction of 1/4' from 3/4' supply.
I figure the pump will produce about 10 - 12 psi. These materials pass into a floating sluice, which filters and recovers the gold. This is my 1 1/4' venturi suction nozzle for my electric micro dredge powered by a 24v 3700gph bilge pump. It sucks up rocks, gravel, silt, and anything else at the bottom of a streambed using a gas-powered pump and suction hose. Without getting into an explanation of friction loss of your ten foot, one inch diameter pressure hose, you will require 33.5 psi at the pump to provide the 30 psi at the eductor.For the amateur prospector who wants to take their hobby to the next level but doesn’t want to work in a mine, upgrading to suction dredge can be a great way to find more gold while still enjoying the great outdoors.Ī suction dredge essentially works like a heavy-duty underwater vacuum cleaner. Refer to a conversion chart to find conversion of decimal inched to "regular" inches which is fractionally larger than 1/2".Īt 30 psi the 1/2' eductor will require 41 g.p.m. Bathtub test of the two pumps in clean water picking up small bits of lead solder and air rifle pellets using the same suction nozzle. I like to have both a suction nozzle and a jet setup for my dredge, and use the one best for the area Im working, for 8' to 12' of depth I would use the suction nozzle. Suction nozzle is best for shallow water, especially if the end comes out of the water occasionally. Dredge works great as a bedrock cleaner upper and can be used to s. Jet will make more suction, and stronger lift. 264 IMPORTANT: this is the radius of the eductor size - NOT the bore size! Worked some clay bedrock and found some nice pieces. Now for the tricky part: convert backwards and finally come up with a bore diameter.Įductor size is. inchesĮxample: 2 inch jet Ģ inch jet = 3.14 x (1" (radius of jet) Squared)ģ.14 sq inches x 7% (.07) =.
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