DJ's Detectors
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Blue Concentrating Bowl This bowl is very effective for separating the heavy black sands from the gold, and is easy to operate. Requires very little water. Couples to any garden hose so it can be used at home or in the field with the water from your dredge's pump.
Blue Bowl Instructions A few minutes spent reading these instructions will save you time and produce amazing results. Before getting started you will need to wash the interior surfaces with a mild dishwashing detergent such as Ivory, Joy, or Dawn to remove any oily residue. This should be repeated periodically to ensure the Bowl surfaces are clean and oil free. Never scrub the Bowl with an abrasive, ever! Using a self-contained method is the most efficient and recommended way for processing your prescreened concentrates. First, prescreen your concentrates to at least 30-mesh using a classifier sieve. Screen them into the pail you store your concentrates, with water until you are ready to process them. Keep the concentrates wet with water treated with an emergent such as "Jet Dry" to break the surface tension, and prevent fine Gold from floating over the top of the cone. Jet Dry and similar products are available at most grocery and discount department stores. A 12-V, 750-GPH submersible pump provides an ideal low-pressure water supply for the unit. Pre-rigged 12-V pumps are available at Pioneer-Motherlode Mining Supply. Level the Bowl so that the water is even with the top (outer rim) of the Bowl, the Bowl is equipped with adjustable folding legs that extend to level the Bowl on the bucket it rests on during operation. For optimal results, it is imperative to prescreen the concentrates using a 30-mesh sieve before adding them to the Bowl. Classifying the concentrates using nested sieves (30, 50, 100) will speed up the process considerably. For example, 100-mesh concentrates require more time to process than 50-mesh, etc.
To recover micro-fines, prescreen the concentrates using a 50, or 100 mesh sieve. After adding the concentrates to Bowl, adjust (increase) the water flow slowly until waste discharges over the center cone. Set the control valve to maintain a constant water level. Note: Maintain the water level 1/4" from the top of the outer rim of the Bowl when using 50 mesh pre-screened material; 1/2" from the outer rim if prescreening using 100 mesh pre-screened material. A good rule of thumb is, the higher the screen mesh number, run lower and slower. This isn't rocket science… If material flows over the edge of the Bowl, or the water flow is too great causing gold to be swept over the inner cone into the retention bucket, don't panic, the gold will remain in the bucket, or tub for that matter. The learning curve is about as steep as the mountains of Florida. If the water flow rate is to great, cut it back; too low, increase the flow. Watch the discharge over the rim of the inner cone; if you see micro Gold being swept over rim, slow it down a little. |
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Send mail to doug@djsdetectors.com with questions or to order products. Copyright © 2003 DJ's Detectors
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Fill the Bowl with treated water; shut off
the water supply, then add one cup of concentrates along the outer edge the Bowl
(inside). Always close the water supply valve before adding more concentrates.
We recommended adding no more than 1 ½ cups at a time. After placing the
concentrates in the Bowl, open the water control valve until the water level
reaches the top of the outer rim without spilling over the rim. When the water
reaches the top outer rim of the Bowl, adjust the flow to prevent it from
flowing over into the 18-gallon tub. 
