Been messing with this project on and off for a few years now. Finally got it where it was ready to be tested this past weekend.
Was originally a keene 3 inch with 4 hp motor and p160 pump i believe. I sold off most of the 3 inch parts and started building the components need to turn it into a 4 inch. From the 3 inch all that remains is the frame, floats and motor and pump combo. I bought a 4 inch flare from keene, since i have no good way to fabricate a lightweight flare. Everything else i have been working on fabricating, primarily being the sluice (16x40), riffle trays, and the power jet.
The power jet is were i diverged from most of the current designs that are widely used. I wanted to build a 4 inch as light as possible while still using the 4hp motor and pump combo, as most the streams i work are shallow and dont require huge amounts of suction for dredging at great depth. The problem was that the 4hp motor and p160 pump struggled in my mind to provide adequate suction to the 3 inch even when near full throttle. Based on this i decided to build a copy of a dahlke tri-jet which should allow a 4 inch to be run off of a smaller motor and pump when compared to a normal 4 inch, due to increased efficiency over a standard style of power-jet.
Pictures of the tri-jet in various stages of completion:
Picture of the sluice and riffle tray, first iteration with woven wire:
Testing day! Couple of issues were noticed while testing. There were a few leaks in the power jet, the woven wire was too open and large rocks would get stuck on it, the high pressure hose was way too long and since it was inch and quarter and so is the pump output , it was constricted to less than inch and quarter at the coupling areas, and the long high pressure hose probably caused a loss in pressure due to friction. The power jet should also be mounted not right at the flare but a few feet from it, so that the hose acts as a longer jet tube and helps increase suction, a 20 ft suction hose also didnt help.
But regardless i was able to dredge with moderate suction, with it. So the test was a success, and with the various refinements it should have greater suction and water flow.
Then the next day, the various refinements and fixes from the problems noted during testing. Replaced the woven wire with 3/8 inch 40% open punch plate, moved the jet so it is mounted about 3 feet from the flare, shortened the high pressure line and increased it to 1.5 inch so there are no restrictions, patched the holes in the power jet, and painted it. I do have a question or everyone, would increasing the size of the footvalve and intake hose from 2 inch to 2.5 inch help increase the gpm of the pump at all? The footvalve cage that came with the keene pump seems small to me. I have some pictures below showing the difference.
I look forward to hearing from everyone! It was a fun project!
Found this cool magnet while looking for other stuff. Thought I would throw it out there. Cheesy plunge magnets for black sand and what not always drove me nuts. But this is well built and for its size has impressive power 60lb pull and 17lb shear. Turn the switch to release the magnetic pull. Very cool.
Caught some info online today about an inventor named ..............He spoke of a patented a process that treated black sand concentrates with gamma rays. this was said to have greatly increased recoverable gold.
this ties in to a hypothosis i have abt "growing" gold.
does anyone know anything about this process?
Steve i tried to load this in the accessories forum but it is archived--- would you mind placing it in the correct place for me,,,thx paul
One of these is a little better than the other----pretty simple
I figured this forum is busy and a great place to throw this out.
It sells for $99.00, and the science behind it sounds reasonable. Screening your material and controlling the water flow should allow the user to tweak it up to a functional level. It's been out for about 5 years, yet has few videos, many good comments, but some not so good ones. I only have lots of flour gold where I live, and am looking for an affordable' simple tool to reduce my concentrates at the end of my season, to then run them through a second time, then through my miller table. Below is a link to the product:
Any comments would greatly be appreciated.