Hey Yobs how are ya mate, itching to get out, but gotta move, so busy, oh I hate packing, throwing stuff out, so much stuff gone to tip. You can go as small as needed to get into the cracks.
One thing to note is that we reduced the 25mm suction hose at the tip to prevent blockages by using a small nozzle cut down to 12mm. Here's a before (left) and after (right) of a bedrock area done with our original first type of ground-based setup. Note: Just added the 30cm steel ruler for scale. Still some kinks to work out with this new design. I'm still debating on whether or not to add a small base to the pump to kneel or stand on. The pump itself is a Jabsco Manual Bilge Pump and they run around $130-ish. Our previous design was all used on the ground with the pump attached to a small separate stand. It can also be left on the ground in an upright position (to let gravity do the work). Just need to attach the main PVC section to a sturdy backpack. That's why this type of hand pump works so effectively I will be taking this pump out with me when my prospecting season starts in the coming weeks and hope to make some more videos to show how it works but if anyone wanted to make one as a project, I highly recommend it as it's a fun build with impressive results.We are under the same rules and regulations here in N.S.W. The cost to make one of these pumps is really minimal, especially if you can scavenge suitable parts because it doesn't have to look pretty as long as it works as its supposed to, I think this cost me about £15 in total to make ($25). One of these 4" manual gold pumps can fill a 1/4" classifier in just 3-4 draws depending on the material being worked, so they can save a lot of time compared to smaller versions of the pump which can take 5-10 minutes to fill the same classifier. These pumps are great to use where you are not allowed to use any mechanical processing to remove material from rivers & streams as this is a purely manual process. I have a previous build version of this 4" manual gold pump on my youtube channel but due to trial & error, I have improved upon the previous design to make my 4" manual gold pump lighter, lose less material and create a smoother suction vacuum.
Here's a video showing how I've redesigned and made my monster 4" manual gold pump/dredge.
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