Arizona republican., 1907-10-18
DRY CONCENTRATING
 PROVED A SUCCESS
Invention of N. C. Westerfield, Now Thoroughly Tested, Will Be Prac- tieally Utilized Here.

chine which if it will do what he
 claims for it and what he claims it has
 already done, ought to revolutioniZe
 gold mining in these parts and in many
 other countries where water is scarce.
 According to the facts and figures of
 his experiments, which have been con-
 ducted on rather a large scale in the
 field and not in the laboratory as so
 many such tests are, his dry concern
 trating process will save a larger per
 centage of gold than any other plan of
 reduction yet invented, and cheaper
 even than the wet processes. It is the
 contention of Mir. Westerfield that he
 has the only successful dry concen-
 trating process known, all others hay
 ing been failures or but partial suc- cesses. Neither should it be confound
 ed with the so-called dry washers for
 while it does the same work and does it better it i>~also designed to reduce quartz formations with the assistance of good ore crushing machine.
 Mir. Wseterfield has been engaged in mining for the last twenty-t three years having been in the machinery business before that time. Until recent years he was operating with the usual pro- cesses but all the time had in mind the ideas he proposed someday to incorpo
 rate in dry concentrator. When irv- got around to do so very few years ago he found his familiarity with machinery was a great aid to him and if he has any regret it is that he did not engage in his dry concentrating experiments before for he is satisfied
 with hfC avnAripnanfG that he now has something 0lat will mean money for him and for every operator Who uses his invention under conditions that are favorable. for ad- mittedly there are some gold deposits that cannot be profitably handled by his process or any other yet known to men.
 Mir. Westerfield formerly lived in Philadelphia for a great many years but built his first concentrator in Chi cago. He was certain of its merits and did not care to waste any time with laboratory tests so he brought his ma chine and his family straight to Phoe- nix and began to look around for a To- cation. He was greatly impressed with the QuartZsite section and put the machine in ope ation there but found that while the so-called placer fields carried plenty of gold it was contained in a sort of cement that his machine could not handle and the experiment was therefore a failure. He then brought the machine to Phoenix and erected it in the rear of the Arizona Hardware and Vehicle Co.'S store. de- termined to make further experiments. which he proceeded to do tO his satis- faction, though any changes made in the machinery were trivial details and the principles on which it was first built have never been changed in the slightest.
 While the machine was standing there Mir. Westerfield induced w. $. Goldsworthy, general agent of the s. F. P. & P. to furnish a quantity of gold bearing sand from some placer holdings on Lynx creek seven miles from Prescott. in which he was inter- ested. for practical test. After the dirt reached Phoenix an assayer sam pied it and announced that its gold value was Ss per cent per ton. After the assayer's samples were taken the of the dirt weighed just 2370 pounds. It took about twenty to run the material through the machine and the product was 91 cents. This is very near the assay value of the dirt. Mir. Westerfield how ever still considered the machine as being in the experimental stage and on the suggestion of some one that the values were not being saved he ran the dirt through again and only secured fraction of a cent additional.
 The machine was then taken to Pres colt where it was installed on the ground And was operated with entire satisfaction. MT. Wester- field, his son and a son of w. H. Taylor of this city a.u a relative of MT. Goldsworthy then went to Nevada where a machine was placed near Round Mountain. MT. Westerfield be- ing taken sick came back to Phoenix but the machine is operating there with very satisfactory results, as well as at Manhattan. Three more ma chimes are now being placed in Cali fornia and will be running shortly.
 It is Mir. Westerfield's intention to put up machine somewhere in this vicinity if he can get desirable prop erty. He does not want to buy mine but he wants to work one and he is satisfied there are scores of them in that can be made a magnifi- cent success with it. He requires free milling ere or gravel or sand. any thing that can be crushed finely can be concentrated successfully.
 No attempt will be made to describe the machine except as to it's principles which are specific gravity, graduated air currents and reciprocal motion in stead of the knocking and jarring of the flaming mill movement of the old Ia ashioned dry washers or concentrators. The minerals are thus precipitated more perfectly in stead of being jolted away with the gang matter. In respect of air currents they can be regulated to the character of the material handled. If it is found they are too strong they { can be toned to any force desired. A system of steel rods also takes the place of the old wire screens that be- come clogged, so there is always an opening for the metal to get through, and it's gravity, no matter how small he difference insures it's saving. The process is also gradual. The material is reduced in size five differ ! mt times in its course through the machine and with each reduction the