![]() Then you launch into a production program to recover the gold or other valuable minerals from the deposit. Greater speed is desired the larger the diameter is for larger jets to move the bigger cobble.How to outfit a suction dredging project, to a large degree, comes back to how you would answer the following questions:ġ) What am I trying to accomplish ( sampling, production, or both)?Ĥ) How much of a budget is available for acquisition of equipment and for operational start-up costs?Ī gold (and/or gemstone) mining project basically should to be looked at in two separate steps: First you sample to locate a viable deposit. Trajectory Methodsįlow velocity before the jet in the range of 8-10fps is good suction for jets in the 2-4" range. USBR Water Measurement Manual - Chapter 14 - MEASUREMENTS IN PRESSURE CONDUITS, Section 13. Here is link to a good way to measure volume. ![]() I also like to use volume measurements to determine efficiency and flow velocity up the hose under operational conditions. With a good working infinity jet and the pump running at 30-40psi range, you should be able to get lift in the range of 7-9ft in the hose. Expect to loose around 15" of suction for every 10ft of hose length added to the front of the jet in actual operation. This will provide a rough measurement of suction vacuum in inches of water (inh20). Run the jet and measure the lift (in inches) from the surface of the water to where the height of the water stops in the hose. ![]() If you do not have access to a vacuum gauge then you can attach 10ft of clear spiral hose to the outlet of the jet and raise the hose straight up out of the water. Was the 5lbs related to overall weight or PSI? A vacuum gauge is a good way to test if you have one. ![]() Mike, can you elaborate on your test setup. ![]()
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