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Post by chimpy on Jan 30, 2012 13:53:40 GMT 10
G'day Bobby As a rough guide 1/2" mesh should take care of classifying and if you are going to use drop riffles, put a couple of V riffles before the mesh to catch any large nugs so they don't go off the end(never seen one in there yet ) You may be better off using a 12v bilge pump for a small unit or a 1.5" petrol transer pump for larger units as you want a consistent and controllable water supply to get the right flow. As far as fall goes most people use 1" for every 12" but make it adjustable for up to 2" every 12" for tweaking your setup in the field. If you want to see how square drop riffles perform (seem do most of the work catching fine gold) there is a pic in a post called "it's alive" of a rig I built. On page 2 of this section. You can see clearly on the left side of the pic how the heavies have stratified and built up at the back of the riffles with lighter gravels on top. A lift-out bottom tray makes clean up so simple that a "lazy-L" seems like hard work. Goodluck with your build Cheers Chimpy
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Bobby
Super Sluicer
Posts: 316
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Post by Bobby on Jan 30, 2012 16:16:55 GMT 10
G'day Bobby As a rough guide 1/2" mesh should take care of classifying and if you are going to use drop riffles, put a couple of V riffles before the mesh to catch any large nugs so they don't go off the end(never seen one in there yet ) You may be better off using a 12v bilge pump for a small unit or a 1.5" petrol transer pump for larger units as you want a consistent and controllable water supply to get the right flow. As far as fall goes most people use 1" for every 12" but make it adjustable for up to 2" every 12" for tweaking your setup in the field. If you want to see how square drop riffles perform (seem do most of the work catching fine gold) there is a pic in a post called "it's alive" of a rig I built. On page 2 of this section. You can see clearly on the left side of the pic how the heavies have stratified and built up at the back of the riffles with lighter gravels on top. A lift-out bottom tray makes clean up so simple that a "lazy-L" seems like hard work. Goodluck with your build Cheers Chimpy Thanks Chimpy . The first unit will be a small quick sampler type with just gravity water supply then later a large one that's powered with a petrol generator running a 750watt dirty water submersible pump . Had a look at that ( Its Alive thread ) very nice build , yes I could see what"s happening with the heavies in the riffles . Those V riffles maybe place closer like this VVVV Like some more info on how you built the legs for it please ? Best Bobby.
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Post by jasonr on Jan 30, 2012 20:43:37 GMT 10
Classification Stratification Water speed Vibration Depth over riffles ? didnt come across those terms when i built my first, and only h-banker built out of scrap metal too Hasnt let me down yet. Had a rough plan, had seen other riffles in action, and built everything using my eye-ometer and a ruler. Riffles were L shape aluminum strips tapped a couple of times with a hammer to give a slight angle to allow water to "flow with slight turbulance" without turning each riffle into a small dam. I wanted to get something together that would work, and quickly, as i wanted to get out into the feild with it as soon as possible Others may argue that without the correct angle and the specific sized this and that, i would be losing soooo much gold. Well I am certainly happy with what i have got with it, and any that I may have "lost" well, too bad, the next guy can enjoy finding it. Hopefully the same enjoyment I get out of just doing it Bottom line, forget the so called "right way" and make it your own way. Have a look at the pictures on the forum that others have posted and their hints etc and use them as guides. Guarantee you will end up with something that you will find great pleasure in using, and once you see the gold in it, thats just one big bonus. jasonr
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Bobby
Super Sluicer
Posts: 316
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Post by Bobby on Jan 31, 2012 11:08:23 GMT 10
Classification Stratification Water speed Vibration Depth over riffles ? didnt come across those terms when i built my first, and only h-banker built out of scrap metal too Hasnt let me down yet. Had a rough plan, had seen other riffles in action, and built everything using my eye-ometer and a ruler. Riffles were L shape aluminum strips tapped a couple of times with a hammer to give a slight angle to allow water to "flow with slight turbulance" without turning each riffle into a small dam. I wanted to get something together that would work, and quickly, as i wanted to get out into the feild with it as soon as possible Others may argue that without the correct angle and the specific sized this and that, i would be losing soooo much gold. Well I am certainly happy with what i have got with it, and any that I may have "lost" well, too bad, the next guy can enjoy finding it. Hopefully the same enjoyment I get out of just doing it Bottom line, forget the so called "right way" and make it your own way. Have a look at the pictures on the forum that others have posted and their hints etc and use them as guides. Guarantee you will end up with something that you will find great pleasure in using, and once you see the gold in it, thats just one big bonus. jasonr Hello Jason , So you are saying I should not bother to make a more efficient unit , just slap something together copying others ideas & then rush out to get some & be happy to know I'm losing gold through it so the next person can find it . Well I guess I should thank you for your in-depth technical wisdom & expertise ;D Cheers Bobby.
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Post by Ric on Jan 31, 2012 13:01:17 GMT 10
G'day Jasonr & Bobby Re; Classification Stratification Water speed Vibration Depth over riffles Basically this is just the description of different phases of the process. Classification: separation of the oversize by sieving, or through the grizzly or perforated sheet in the top hopper. Stratification: This is what happens as the wash makes its way along the slick plate and down the riffles. The heavies hold back while the water washes the lighter layers of materials away. ( there's a few different definitions of Stratification but this is how I would relate it to processing gold bearing wash) Water Speed: This needs to be adjusted to suit the material and the angle of the sluice. Vibration: Vibration helps settle the heavies out of the lighter wash material. Generally the motion of the water and wash contributes to this but some people have a little vibrating mechanism driven by water or battery power to help settle the heavies out. The dumping of wash into the hopper and scraping with the shovel also contributes to vibration. Depth Over Riffles: Is the depth of water required running over the Riffles to process the wash efficiently. I hope this has explained things a little Cheers Ric
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Bobby
Super Sluicer
Posts: 316
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Post by Bobby on Jan 31, 2012 18:37:30 GMT 10
G'day Jasonr & Bobby Re; Classification Stratification Water speed Vibration Depth over riffles Basically this is just the description of different phases of the process. Classification: separation of the oversize by sieving, or through the grizzly or perforated sheet in the top hopper. Stratification: This is what happens as the wash makes its way along the slick plate and down the riffles. The heavies hold back while the water washes the lighter layers of materials away. ( there's a few different definitions of Stratification but this is how I would relate it to processing gold bearing wash) Water Speed: This needs to be adjusted to suit the material and the angle of the sluice. Vibration: Vibration helps settle the heavies out of the lighter wash material. Generally the motion of the water and wash contributes to this but some people have a little vibrating mechanism driven by water or battery power to help settle the heavies out. The dumping of wash into the hopper and scraping with the shovel also contributes to vibration. Depth Over Riffles: Is the depth of water required running over the Riffles to process the wash efficiently. I hope this has explained things a little Cheers Ric Hi Ric , Clearly explained , Thanks Bobby.
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Post by Ric on Feb 1, 2012 20:49:51 GMT 10
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Post by trommeldude on Feb 7, 2012 1:39:49 GMT 10
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Bobby
Super Sluicer
Posts: 316
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Post by Bobby on Feb 7, 2012 9:36:51 GMT 10
Wow what a site thanks Trommeldude , this should start some healthy debate ! Cheers Bobby.
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Post by trommeldude on Feb 7, 2012 15:26:32 GMT 10
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Bobby
Super Sluicer
Posts: 316
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Post by Bobby on Feb 7, 2012 16:47:18 GMT 10
Excellent information , will take some time to study but already enjoyed the section :- Common Gold Recovery misconceptions a real eye opener Thanks again Bobby.
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Post by darylr on Feb 8, 2012 8:46:55 GMT 10
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