So, after playing around with a few ideas, I figure it's time to go ahead and make a larger scale sluice. No tiny 95GPH flow, this is going to be 500GPH. That's just over 5 times as powerful as my previous "pocket sluice". This is basically a small Gold Cube. Half the width, and scaled down in some areas. This one is designed to take real gold sluice rubber matting. I bought two types, one is generic "High-Low" matting that's 2.3mm tall. The other is "Vortex" matting, and it's 7mm tall.
The trays I have are designed to print with minimal supports and material, hence the honeycomb grid. There is a little angular lip at the top of the matting area that keeps the top of the mat in place, and places the water and material flow completely onto the mat. The little pegs at the bottom keep the mat from sliding down, and and small enough to not impede water flow in any meaningful capacity. The underflow section at the top is actually the exact same dimensionally as the Gold Cube, so that the water flow works correctly. Under the foot where the underflow is, is a cutout that fits into the raised pegs at the top of the bottom end, so they can stack neatly. There is only 0.3mm of play between the parts, so that it's a nice, tight fit.
The top tray, or "slick plate" is the same general idea, and has a 9 degree angle, just like the matting tray. The red lid slides into the slot around the top, and creates a tight sealed box that directs the water flow. It has only 0.3mm of clearance. The back of it will end up having a threaded tube, 3/4" to allow a bilge pump to be hooked up to it. What's not pictured here is an additional piece that directs water flow down to prevent excess splashing and uneven output.
This is a 3D printed blue bowl version 1, it worked amazing for doing my last big clean up and sucked the sand away very quickly. I didn’t want to pay an arm and a leg so I built my own, leave an e-mail if you want the file. The whole project cost me less than 30 bucks or so.
-172 GPH Pump
-12 #10-24x1in Screws
-9 #10 Washers
Well, as far as I can tell, it's the smallest FUNCTIONAL sluice box. This isn't a cute scale model to look like a neat paperweight. This thing actually WORKS! Let me know what you think! This has taken me well over 4 months to develop past where you saw it last time. I still have a few minor tweaks I want to do to it, but all in good time.
As long as you can spoon feed it small enough material, this will work for you. I guess this would be more suitable for processing concentrates, but it should still be a hefty worker!
* Self-contained power (4x AA rechargeable batteries @ 1350mAh each)
* 3x 120 LPH micro pumps @ 6volts each
* Self-recycling water system
* Can be used as a single or double tier system
* Sluice trays are set at 8 degrees
* Removable riffled drop-ins (currently printed in green) (upgradeable/swappable)
* Debris catch bin for removing excess material from the basin
* Scotchbrite scouring pad used as a particulate filter to prevent pump clogging
* Fully disassembles and packs into itself for painless transportation
* Watertight, isolated battery compartment won't get wet from splashes or overflow
* Drain holes to prevent water buildup around solder connections to pumps, and in storage area
* Spare storage area can be used for rubber mats, vials, filters, etc
* Riffled trays (3D printed) designed for use in this system with its specific flow rate/angle
* Quickly comes apart for cleaning of the trays or storage
* Currently takes 687.52 grams of PLA filament @ 1.75mm (52 hours to print on my settings)
Things I want to improve in my next version:
* Isolate the pumps better so they don't suck up material or silt
* Raise the edges to allow it to process larger piles of material without spilling over the sides of the trays
* Make a better trap to catch the waste material, rather than let it build up in the main basin
* Design riffle drop-ins that are more easily removable
* Possibly design different types of riffle drop-ins
This one was just before this 2-tier version, when it was at a single level.
Check out this point in the video, where a pretty good size nugget shows up!
My sister ran into a fossiker when out camping who was having an issue with tiny shot while finish panning. He was sucking the shot into his snuffer bottle when trying to collect the gold. Any suggestions? I have a feeling he's not the first person to be annoyed by this.