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Gold Prospecting
Prospecting Equipment
riffle setup with expanded metal
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<blockquote data-quote="dwt" data-source="post: 144955" data-attributes="member: 428"><p>Howdy Next1, riffles are usually governed by your pump size/water flow, in a nutshell, you want the water to skip over your riffle, and at least start to flatten out and build up speed before it hits the next riffle, this helps keep the sluice box clear of lights, and assists in creating a few dead zones ( slow moving, low pressure areas) around the riffle enabling heavies to drop out, some of the better riffles I have seen and used are the Hungarian style riffle, </p><p>Personally, I have found using a 2 inch high pressure fire fighting pump, only a few rpm above idle, I usually keep my riffles in comparison with the width of the box, 400mm wide sluice box, 400mm between riffles, and of course riffle height is governed by screening size.</p><p></p><p>Ps, the above method is my personal choice, as for the 400mm x 400mm theory, well I blew that outa the water when I built a 100mm sluice for a mate, I then found that under 300mm wide, I added 100mm to the distance between riffles and that seemed to return the water back to its pressured/low pressure state <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="dwt, post: 144955, member: 428"] Howdy Next1, riffles are usually governed by your pump size/water flow, in a nutshell, you want the water to skip over your riffle, and at least start to flatten out and build up speed before it hits the next riffle, this helps keep the sluice box clear of lights, and assists in creating a few dead zones ( slow moving, low pressure areas) around the riffle enabling heavies to drop out, some of the better riffles I have seen and used are the Hungarian style riffle, Personally, I have found using a 2 inch high pressure fire fighting pump, only a few rpm above idle, I usually keep my riffles in comparison with the width of the box, 400mm wide sluice box, 400mm between riffles, and of course riffle height is governed by screening size. Ps, the above method is my personal choice, as for the 400mm x 400mm theory, well I blew that outa the water when I built a 100mm sluice for a mate, I then found that under 300mm wide, I added 100mm to the distance between riffles and that seemed to return the water back to its pressured/low pressure state ;) [/QUOTE]
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Gold Prospecting
Prospecting Equipment
riffle setup with expanded metal
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