You are hereGravity Division with the Sluice Box
Gravity Division with the Sluice Box
Gravity Division with the Sluice Box
Successful gravity division of gold on the sluice box happen only when the feed pitch of the sluice width of the sluice and the quantity of water approaching onto the sluice are at optimum conditions. The only way to find these optimum conditions it to make research .Normally the rate of pitch of the sluice should be at least one and one half inches drop to the foot. If too steep gold will be washed off the sluice, if too flat sanding will happen. If the sluice is too wide for the volume of water presented, sanding will happen and the material will move down the sluice in conduit cut in the sand. If the sluice is too narrow the gold may not have a change to drop to the base and be saved. Too little water will cause sanding. Too much water will avoid the gold from settling to the base of the sluice and being catch. The quantity of material fed on to the sluice must be regular .Varying feed will cause the floors of the sluice to alternately sand up and then be washed clean, and a poor gravity division will happen.
A good gravity division on the sluice need regular quantity of material being carried down the sluice by a certain quantity of water, and the pitch of this sluice is such that the heavier gold flakes have a chance to drop to base and be captured. But the lighter material will not be carried off the end of the sluice. By altering these variables these optimum conditions can be found. Riffles are used on the flat base of the sluice to cause turbulence in the water, which drop the gold particles, and trap these particles once they are dropped. As indicate earlier steel punch plate riffling with indoor outdoor carpet under it works well on fine gold (10 meshes and less). If crude gold is present, extra riffling may have to be added to guarantee that it s saved. Over again this is a case of trial and error, so make your riffling so it is easy to put and eliminate. If the sluice will save the crude gold or the fine gold but not both, it may be required to use 2 sluice boxes. The 1 will have stricter riffling and will be used to save the coarse gold. The tails from the 1 sluice will then be re-screened to a smaller size and put over the 2 sluice. This sluice will have a compliment pitch and be adjusted to save the fine gold.
The concentrate made on the sluice box is not a clean concentrate. It should hold all of the gold, but also black iron and small quantity of sand. If the placer operations large enough to defend it a clean up mill as illustrate earlier, may be built .Minor operations may want to send their concentrates out to a mill to be cleaned. The mill will make pure placer gold, or sponge buttons or gold bars from the concentrates. The pure placer gold can be sold to the smelter. If you want to procedure your gold into bars or sponge buttons manually, a concentrating table amalgamator, retort and liquefy furnace will be required. The concentrates from the table are put into the amalgamator and amalgamated, retorted and melted, as explain earlier. If bullion is to be made a gold dissolve, authorize is essential. No authorize is required to make sponge buttons as long as one does not have more than 200 troy ounces of gold in sponge button form sat any one time.
