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Gold Prospecting
Alluvial Gold Prospecting
North east vic
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<blockquote data-quote="CreviceSucker" data-source="post: 508769" data-attributes="member: 1804"><p>Dredges in the old days were very rough and couldnt catch the fine gold , probably anything smaller than 20 mesh would wash straight through the sluice boxes , they also mostly used bucket conveyors which missed the best gold which was in the bottom few inches of gravels on the bedrock.</p><p></p><p>If they had used suction dredges like you see these days being used to clean up shipping lanes and for beach reclamation they could have vacuumed the bedrock and crevices and would have put 95 % of the gold through the sluice boxes.</p><p></p><p>As an example to you , most of the dredges that worked the Shoalhaven river went bankrupt because the gold was so fine they had a LOSS RATE of 94 %..... yes they caught only 6 % of the gold :brokenh: </p><p></p><p>Modern professional sluice designs could now capture 99 % of gold put through them down to 200 - 400 micron.</p></blockquote><p></p>
[QUOTE="CreviceSucker, post: 508769, member: 1804"] Dredges in the old days were very rough and couldnt catch the fine gold , probably anything smaller than 20 mesh would wash straight through the sluice boxes , they also mostly used bucket conveyors which missed the best gold which was in the bottom few inches of gravels on the bedrock. If they had used suction dredges like you see these days being used to clean up shipping lanes and for beach reclamation they could have vacuumed the bedrock and crevices and would have put 95 % of the gold through the sluice boxes. As an example to you , most of the dredges that worked the Shoalhaven river went bankrupt because the gold was so fine they had a LOSS RATE of 94 %..... yes they caught only 6 % of the gold :brokenh: Modern professional sluice designs could now capture 99 % of gold put through them down to 200 - 400 micron. [/QUOTE]
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Gold Prospecting
Alluvial Gold Prospecting
North east vic
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