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Mining - Mining - Dredging: Dredging is the underwater excavation of a ... takes place—and the top end is lo ed near the centre of the dredge, at the feed ... The chain of buckets passes around the upper end of the ladder at a drive ... and traps heavy minerals such as gold or tin that might fall away from the standard cutter.
Placer dredges, rated according to bucket size, have ranged from 1-112 to 20 cubic feet, although larger equipment has been used in harbor work. Lines of 34-...
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using steel "buckets" on a circular, continuous "bucketline" at the front end of the dredge. The material is then sorted/sifted using water. On large gold dredges,...
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The stockpiling hole was always dug at a slightly higher elevation ... anchoring or manipulating gold dredges in rivers or ponds, or ... sold to claimholders, a charge was made at so much a head for ... pipe sections could be hot riveted into standard lengths hence ... the bucket-chain was discharged into the upper end of the.
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A bucket ladder dredger has a series of buckets mounted on an endless loop that ... and then carry the material in the upright buckets up the ladder to the top. ... gravel or for minerals such as gold and tin ores, bucket dredgers are still used.
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