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Ore Jig: a Power-Driven Movable-Sieve (Cornish) Jig at Mill 12 (Richards, 1903)
An ore jig sorts crushed ore by weight: a box with a screen bottom is jerked up and down in a tank of water, so the heavy mineral settles to the bottom of the bed and the light rock stays on top to be skimmed off.
Robert H. Richards' Ore Dressing (1903) gives the sizes of the movable-sieve Cornish jigs at his Mill 12: a box of 1-inch boards 22 by 46 inches with a 5-mesh screen, worked by a lever and an eccentric in a tank 7 feet deep, with 6-minute jigging charges skimmed by hand.
He does not say what the tank, lever and eccentric are made of; those are Unknown here.
Source: R. H. Richards, Ore Dressing vol. I (1903), § 383, p. 506. Picture: his Figs. 300a-300d, the hand jig at Mill 2.
中级
Several days to build
说明
1
1
Read Richards
Read Richards
"These differ from the continuous, movable sieve jigs in that the feeders, the hydraulic water, the discharges for coarse concentrates, hutches and tailings, are all left out. They are practically hand jigs adapted to power."
2
2
Build the jigging box
Build the jigging box
Make the jigging box of 1-inch boards, 22 inches wide and 46 inches long, with a 5-mesh screen across it so that the box stands 7 inches deep above the screen and 3 inches below it.
此步骤所需材料：
木板材1 1-inch boards
粗孔筛网1 5-mesh所需工具：
木工锯
锤子
卷尺3
3
Hang it in the tank on a lever
Hang it in the tank on a lever
Set up a tank 30 inches wide, 54 inches long and 7 feet deep, full of water. Hang the box in it from a jigging lever with a long arm of 4 feet 2 inches and a short arm of 10 inches, the box on the short arm, as in the hand jig of Figs. 300a-300c. Drive the long arm from an eccentric with a 5-inch throw, which gives the box a 1-inch stroke. Put a hitching post beside the jig to hold the sieve up out of the water. The materials of the tank, lever, eccentric and post are not given (unknown).
此步骤所需材料：
未知材料1 tank, lever, eccentric, hitching post所需工具：
木工锯锤子卷尺4
4
Jig a charge
Jig a charge
Feed ore crushed to 2 mesh and finer. Shovel it into the jigging box until the bed is 8 inches deep, connect the lever to the power and jig for 6 minutes. Then disconnect it, lift the sieve out of the water and hitch it to the post.
所需工具：
铁锹5
5
Skim by hand
Skim by hand
Skim the bed off in layers: the top skimmings are waste, the middlings go back to be jigged again, and the coarse concentrates at the bottom go to the smelter. What falls through the screen (the hutch) is left to collect in the tank and finally shoveled out for the next, finer jigs.
所需工具：
铁锹6
6
History and honest limits
History and honest limits
Richards was professor of mining engineering and metallurgy at the Massachusetts Institute of Technology. At Mill 12 four such jigs worked as No. 1 jigs, followed by two No. 2 and nine No. 3 jigs like them; at the Hartman mine in Pennsylvania a similar jig was worked on a 1-inch bed of coarse limestone tailings, adding 2-inch layers of ore.
He gives the sizes of the box, lever, eccentric and tank, but not their materials (except the 1-inch boards) or the fastenings; the tools are ours.
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