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Gold Prospecting
Do It Yourself (DIY) Projects
Thinking of Building my own Sluice
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<blockquote data-quote="WalnLiz" data-source="post: 17674" data-attributes="member: 147"><p>Drop riffle sluices are great on gold but will not trap gemstones. Ironstone / Spinel /Sapphires / Garnets / Zircons, ie most material of similar specific gravity need a raised riffle to slow their progress through a sluice. </p><p></p><p>Once a drop riffle is full of this material, (usually only takes one bucket) then all the rest of the material (Heavies),minus the gold, will run over the sluice. This is where the displacement theory comes into effect. Ironstone makes up the majority of the heavies and this will be the first trapped. 90% of the subsequent heavies (including the gems) will now have too small a vortex to hold them up....hence back to the stream they go.</p><p></p><p>Cheers Wal.</p></blockquote><p></p>
[QUOTE="WalnLiz, post: 17674, member: 147"] Drop riffle sluices are great on gold but will not trap gemstones. Ironstone / Spinel /Sapphires / Garnets / Zircons, ie most material of similar specific gravity need a raised riffle to slow their progress through a sluice. Once a drop riffle is full of this material, (usually only takes one bucket) then all the rest of the material (Heavies),minus the gold, will run over the sluice. This is where the displacement theory comes into effect. Ironstone makes up the majority of the heavies and this will be the first trapped. 90% of the subsequent heavies (including the gems) will now have too small a vortex to hold them up....hence back to the stream they go. Cheers Wal. [/QUOTE]
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Gold Prospecting
Do It Yourself (DIY) Projects
Thinking of Building my own Sluice
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