Sampling Table

The concentrating table can be tilted to compensate for light or heavy materials and can be easily handle a 50 to 1 000 pound sample. The harvest of a gravity division on the concentrating table are the concentrate or “cons” ,the middling or mids, and the tails .sometimes the mids are include in the tails. Simply, a gravity division is to divide the heavy material from the light material. Rarely, still is it as simple as it sounds when working with placer material. If all of the grains in the sample were the same size, shape and thickness a very precise gravity division would be probable .Still, the different size and forms of the gold particles can make them complicated to concentrate. Thin flakey particles perform like material with a smaller density and may show up with lighter material at the end of the division. Considerable particles of iron and other heavy material can even pack these thin flakes out of the concentrate and into the mids or tail. These aspect help determine how the pitch of the table is set to guarantee a full recovery of the gold in the sample.

The sample is fed onto the high corner of the table and the division happen as the material moves to the converse end of the table .The back and forth progress of the table moves the material towards the contrary end and the pitch of the table moves the material at right angles near the base of the table. It is somewhat like walking across a steep snow cover of hillside. Each time you take a step ahead you slip down the hill a small space. By the time you get across the hillside you are lower than you started. By the point the material in the sample access the end of the table it is lower. The lightest material has dropped most and falls off the end of the table near the base corner. The heaviest material has fallen least as it moved across the trembling table and it falls off the end of the table over the other material .The lasting material falls off the table among the heavy and light material.

Pans are placed at the end of the table to grab the material. The heaviest material is the cons, the lightest the tails, and the middle material is the mids. Occasionally riffles are run the full length of the table close to, the top of the table to carry the concentrate. These high grade riffles maintain the heavy material divided from the lighter material as it falls off of the end of the table.