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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: ogi who wrote (25822)	11/18/2006 6:38:45 PM
From: E. Charters	Read Replies (1) \| Respond to of 78410

These are a good type of table, (bump table) but I believe my rocker modification may get better recovery. The action of this spring throws it back sharply against a bumping block, which gives the shake to the table, the shake thus consisting of a series of sharp shocks. Each table is usually 8 feet long by 4 feet wide, and has an inclination of from 3 degrees to 6 degrees to the horizontal. The average number of blows is about 100 per minute, but in working very fine sands as many as 150 per minute are sometimes given, the length of each stroke being about 1 ¼ inches. Above the upper and of the table is fixed a head - board with the usual distributing pins. The pulp to be concentrated is delivered to one - fourth only of the head - board, the remainder being supplied with clear water. If the table were at rest all the particles achieving the journey more rapidly than the lighter ones. The impulse due to the shaking action acts in a direction at right angles to the line of flow, and hence the particles move down in a line, which is the resultant of these two motions; the heavier particles, however, moving more slowly, are exposed for a longer time to the action of the transverse impulses than the lighter ones, and hence are thrown further from the straight line of flow. It is thus possible to obtain a very complete separation of the pulp into concentrates and barren sands, the action being quite continuous.