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As indicated in the diagram gravel is dredged into the suction hose and is delivered to the sluice box header.

A high velocity jet stream is created within the jet tube producing a powerful vacuum. A volume of water is pumped through a tapered orifice (jet), by a special designed water pump. The vacuum on a portable dredge is created by a "venturi principal". THE FOLLOWING INFORMATION SHOULD ENABLE YOU TO UNDERSTAND THE BASIC THEORY OF OPERATION OF A PORTABLE DREDGE.įor more complete understanding on this subject, we recommend you read any one of a variety of books available through the Library of Books, such as The Gold Miners Handbook, Dredging for Gold or Advanced Dredging Techniques. GOLD DREDGE OPERATING INSTRUCTIONS - courtesy of keene engineering. Home > Gold Mining Equipment > Black Sand Magnets (Gold Magnet) > Black Sand Gold Recovery - Part 2 > Black Sand Concentrates > Fine Gold Recovery Equipment > Gold Prospecting - FREE TIPS > Panning For Gold > Gold Prospecting EQUIPMENT (SEE ALL) > Proline Gold Dredges > Diving Equipment > Gold DREDGES for Sale - Keene > Dredge instructions Home > Gold Prospecting - FREE TIPS > Panning For Gold > Gold Prospecting EQUIPMENT (SEE ALL) > Proline Gold Dredges > Diving Equipment > Gold DREDGES for Sale - Keene > Dredge instructions