![]() ![]() The exhaust air must not contain more than 0.005 of the material. Air tank partway through the circuit supplies a constant volume or air, regulates the feed, and is an emergency supply if the compressor fails. Learn about the technical aspects of vacuum cleaners such as: suction power, air flow. Suction nozzle works better in shallow water Power jet Creates a stronger suction Fewer hoses at the “working end”ġ4 Clean-up Coarse pieces are picked out of the sluice on a daily basis.Ĭoncentrates are washed out of the sluice on a daily or weekly basis Exams: sluice is cleaned after each sampleġ5 Clean-up Concentrates (black sands) are processed by panning or using a concentrating device such as a gold screw or gold wheel Very fine gold will require mercury amalgamationġ6 AIR Hooka – low pressure air system using an air compressor feeding air lines and delivering air to the diver through a regulator. Pump drafts (pulls) water and forces it into a pressure hose Pressure hose is a direct path to the intake hose and causes a suction (venturi effect) 2 different configurations Suction nozzle Power jet Production based on experience 4 inch dredge 5 yards/hour 1.6 yards/hour 5 inch dredge 10 yards/hour 3 yards/hour 6 inch dredge 15 yards/hour _ 8 inch dredge 25 yards/hourĩ HOW IT WORKS Engine drives a centrifugal pump and air compressor ![]() Sniping along banks of larger streams and rivers 5 hp engines 20 – 35 foot intake hose 150 – 200 lbsĦ 4 inch dredge Common size 1 to 2 person operationġ person can haul once partially disassembled 5 – 8 hp engine 20 – 30 foot intake 200 – 250 lbsħ 5 inch dredge Common size Single 8 – 11 hp engine, orĭual 5 hp engines Disassemble to transport 30 – 40 ft hose Assembly time: ½ to 1 hour 300 – 400 lbsĨ Dredge Production Manufacturer estimated production Small drainages Poor access 2.5 hp engine 50-90 lbs. Sometimes, its just not possible to make provision for a sufficient settling distance in the pipework before the pump. Range: 2 inch to 10 inch diameter intake.Ĥ 2 and 2 ½ inch dredges “Backpack” dredge Carried by 1 person An Act To Amend the Law Regarding Recreational Gold ProspectingĮmergency preamble.2 Suction Dredging is… The activity of sucking material with a gas propelled pump and depositing it on a sluice to collect the heavy material, or… Underwater vacuum cleaner.ģ Dredge Size Rated by the size of the intake nozzle. ![]()
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