Bisbee daily review., 1912-11-17
Miami COnCentratOr One
 of Biggest in the World

The new concentrator of the Mi. ami Copper Co. Is one Of the largest iR the world as well as one of the most complete in labor saving equip ment and it is correspondingiy ent cient in Its operation, says the Min. ing and Scientific Press The plan IS designed to take every advantage .of natural conditions. such as the lay Of the ground and, al the same time, 1t has incorporated a most complete conveying system into it's design The importance of the mechanical handl- ing of ore is recognized in all modern ore treating plants. and most cases the development of ore deposits would not be commercially possible without the use of conveying machinery. The economy Of cOnyeyOrs lies not only in the great saving in labor. but il also permits accurate sampling and mixing as well as allowing uniform feeding.
 The shaft, crusher building, and stOTagebins ,are all situated on a ridge. In line with the bins and upon the side of the hill is the cuncentrat- ing plant Under this arrangement. the ore, during the concentration. is constantly bening carried towuwarl by gravity. thus passing through the process with no further necessity TOT mechanical handling.
 Skips 1-2 Tons Capacity
 Ore IS hoisted in f-2 ton skips, which are dumped automatically into bins above the cTushers. From the bins the ore Is drawn out by IS in. rotary feeders and delivered to two No. : l-2 gyratoTy CrusheTs. From the crusheTs the ore passes upon 30 in. inclined Stephens-Adamsou belt cOnyeyor, 25T fl. between centers Of end pulleyS This Couyeyor rises in an inclined gallery to a point above the storage bins. where it discharges upon the horizontal distributing con- yeyOr- This is necessarily Of the same width and capacity and is @29 in. between centers. This COuvey0r is carried horizontally in a gallery above a row of six cylindrical steel stOrage-bins Of loo tons capacity each. The conyeyOT is equipped with an automatic tripper travelling back and forth on a track along the cOnveyor line and serving the various bins through openings in the gallery floor
 Rise Separate conveyors
 On delivering the crushed ore to the concentratoT for treatment, a separate conveyor leads from each bin to inc plant An automatic disc feeder and sampler regulates the feed from me Lin 10 the cOnveyor and, at the same time. 1t Is arranged that of the ore delivered by every fifth revolution of the feeder disc, a small percentage ;s automatically diverted as a sample. Under this arrangement an analysis Of the ore may be made at the time the ore Is delivered for treatment and the nature of the treatment is thus iie- The conveyors, leading from the bins to the concentrator are each 1i in, wide and 24 it. between centers leading directly to the reducings rolls in the concentratOr building
 Rolls Protected
 As a protection for the reducing rolls. & power electrO-magnet is sus- pended above the first eonveyor which removes all scraps or iron which have become inteTmixed with the ore. This is A precauticn which sF0uld be taken in all cases where bits of iron or tools by the workmen are apt to get in the ore. cause serious damage l 10 the crushers or rolls. and conss- | quently delay the entire plant
 On account Of the high position of 1 fhe plant, it was not practical to place 1 the coneentrate-bins near the plant I and to bring the railroad to them. The method adopted was 10 place the bins i a considerable distance from the con 1 centrator at a level more easily ac- cessible by the railroad. Tn order to 1 supply the bins under this arrange ment. 1t was necessary to construct l a long tunnel through which the con centrate Is delivered from the plant | 10 the bins.
 The general construction of the con