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Gold Prospecting
Do It Yourself (DIY) Projects
my first attempt at making a sluice need some advice
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<blockquote data-quote="Ag Man" data-source="post: 12086" data-attributes="member: 113"><p>The way I think of it is similar to the way air flows over a ute/truck cabin - the sudden drop of angle at the back of the cab creates a low pressure zone whilst driving at speed.</p><p>You can tuck most things there & they won't blow out, actually things from the back/middle of the tray get sucked forward to the back of the cab.</p><p></p><p>Quite often whilst driving, I'll put my apple core on the roof & watch it drop out behind the cabin rather than fly off the back.</p><p></p><p></p><p>With your sluice it's pretty well the same. gold drops out & gets sucked behind riffles <u>at the right water speeds.</u></p><p><u></u></p><p>Too fast a water flow & everything will blow over & out the sluice.</p><p>Too slow a water flow & everything will drop in behind & in front of the riffles & clog up.</p><p></p><p>If your riffles are too close together then you'll just be making one big lot of turbulance with water going in all sorts of direction.</p><p></p><p>Keep it simple - we're just working with gravity.</p><p></p><p>Sounds a bit complicated but my advice is go out & see someone else sluicing & see what the riffles do & how the gravels behave when the sluice is running right.</p><p></p><p>With some fairly clear & smooth water flow, it's quite mesmerizing how the gravels/sands dance in the riffle section - exchanging heavy particles from lighter ones. All whilst there's no motors running - very peaceful... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Ag Man, post: 12086, member: 113"] The way I think of it is similar to the way air flows over a ute/truck cabin - the sudden drop of angle at the back of the cab creates a low pressure zone whilst driving at speed. You can tuck most things there & they won't blow out, actually things from the back/middle of the tray get sucked forward to the back of the cab. Quite often whilst driving, I'll put my apple core on the roof & watch it drop out behind the cabin rather than fly off the back. With your sluice it's pretty well the same. gold drops out & gets sucked behind riffles [u]at the right water speeds. [/u] Too fast a water flow & everything will blow over & out the sluice. Too slow a water flow & everything will drop in behind & in front of the riffles & clog up. If your riffles are too close together then you'll just be making one big lot of turbulance with water going in all sorts of direction. Keep it simple - we're just working with gravity. Sounds a bit complicated but my advice is go out & see someone else sluicing & see what the riffles do & how the gravels behave when the sluice is running right. With some fairly clear & smooth water flow, it's quite mesmerizing how the gravels/sands dance in the riffle section - exchanging heavy particles from lighter ones. All whilst there's no motors running - very peaceful... :) [/QUOTE]
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Gold Prospecting
Do It Yourself (DIY) Projects
my first attempt at making a sluice need some advice
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