Arizona weekly citizen., 1882-12-17
The Fa~weu Dr, Concentration.


 The model "5ry conceBtrgtor," in charge of MT. II. II. DeHart, which has been ou exhibition ,he past two weeks at the business house of Nichols, Patter- son js Co, anl its operation witnessed Jy a grea; many mining men. was given a practical test upon a small quantity of ore furnished by Mess-s. Handy and Holbrook, taken from a mine in Cababi district, some seventy miles west Of this cIty.
 It is well to state, before giving the results ot its work, that the sole claim of the machine is l. work low grade ores and tailings; ores If high grade, con- taining chlorides of silver and carbon ates Of copper, cannot be worked sue cessfully, as they pass of ID dust and with the tallIngs. The material fur nIshed was supposed Co be low grade, but upon actual test 1t was found to be of a character that dld not realize re- suits such as anticipated, on account of chloudes and carbonates contained. although not entirely satisfactory, still the assays are gwen to the public, and while doing so it must be borne iu mind that no model, worked by hand, upon which a regular pressure Of ar cannot be maintained Ia highly important fea- ture, and the ore to be operated upon not properly sized, also very lnportantj can be made to give as close results ss a full sized machine of capacity of from twenty to thirty tons per diem and oper- ated upon by steam. Such machine can be seen at any time at the works of WnI E. Farwell, the inventor, San Fran cisco, California, in daily operation for the Selby Smelling Company of that city.
 It will also be proper to mention that, as the ore was pulverized in a mortar, much powder or slime was formed, and 4 the proper sizing c5uld have been ct- fected, she loss in the tailings as indi- cated would have been very materially, if not wholly, saved b. passing through very fine screen; far instance, the sizer connected with plant" Is graded from ljJ mesh down.
 The assays of Prof. W. I. Packard, r. C. S., are given as follows:
 No. 1.-QuartZ with copper 2 -auce and carbonate, 37 ounces.
 No. 2-Concentration from same, F Gz., g per cent.
 No. 3-Tailings from same, 16 o., 43 per cent.
 Loss in dust, 9 oz., 9 per cent.
 No. l.-Copper, l4,per cent; silver, l SiSG.97: gold, S6.27 per ton.
 No. Copper, 27.3 per cent; silver, l Sl,l97; gold, Sl0.OI per ton.
 No. Stopper, 5.1 per cen.-; silver, l S~D 1u- fr1l1 SIU NI ugr -Du
 The reasons for loss ih taih8gs have | been stated above, but the increase ln l per ceutage of the concentrates tNO. 2 l certainly show large gain and satlsfGc- | tory evidence that low grade ore can be l worked thoroughly. The attention of | mine owners holding large bodies Of low | grade ore or talllngs, ls invited to this | machine, and if tests are desired, ar- can be made by addressing or calling upon Mr. De Hart, of this . city.
 For some years back great and repeat | ei efforts have been made tJ meet the . urgent demand for @ successful dry ! G. e. machine that wiil . work with alr instead of water as the . medium for removing the worthless . rock, but failure has been the result; ! none of the inventions having come in- ] to general use or been endorsed by pub 1 !lc approval, notwithstanding the deter . mined and perseveriug pufinE that has . been applied to these attempts t0 solve . the problem.
 This invention, however, seems tO ! have hit the mark, having secured the . approval and been actually adopted by . the Selby Smelling Comprny, Of San . Francisco. This fact speaks for itself, and further comment Is supeTiiuOus. . The Frue wet cUucentrator, has of late . been considered the most perfect ma chine Of the kind, but 1t will only ope- . rate on about 1000 pounds per hour, while this machine tcostIuE much lessJ will work 2,UOJ pounds ID .te same time, !. and requires no water.
 Low grade ores at present of no value . can, by means of this machine, be made | profitable at a maximum cost of g. per . ton. Thus Sl0 ore concentrated to one . tenth its weight, would be worth Sl0O . ton, at a cost not exceeding E2o.