Arizona silver belt., 1889-06-08
Tnn TREATMENT or orn Low GRADE
 ORES,

We wcre shown, thls week, letter
 from Mr. C. A. Stetofeldt, the wall
 known metlllurgist and specialist toi
 the metallurgical treatment of silver
 ores, written in reply to certain in quiries by Dr. Alex. Trippel, and con firming what has been so often assert ed, that proper treatment of our low grade ores, such as assay from 50 to 10 ounces silver, would at once Impart life to the silver mining industry in Globe District, and establish 1t on q profitable and permanent basis.
 Mir Stetefeldt refers especially to the cost of treating silver ere by liXi- yiahon, known as the Russell process, which is now largely in use in this country and Mexico, for all ores not fit for smelling, Dr. Irippel had i given hlm all the information posSl- bla, in the compass of letter, of the ores of Globe District, and Mir. Stete- iqldt expresses the belief that our low grade ores are admirably adapted to ! Invitation, and could be treated for Sll per ton at the works, and with a yield of 9l to 95 per cent, of its silver. He also gives 1t as his opinion that most of the ores here need roasting, which always produces better results, notwithstanding the increased cost of
 treatment, X better and cheaper re- duction of ores is of greater import ance to Globe, so far aS the silver iR- dustry IS concerned, than the building of a railroad. In fact, until radical change fer the better in that respect is effected. silver mining cannot be made to prosper here, and ores which m many other districts in Arizona would be made to pay handsomely must re- main practically yalueless, as 90 or 40 ounce ere, with the autquated method of reduction employed here, does not pay expenses
 There is no doubt but that a con tiuuOus supply of low grade ore could easily be had here, for q mill of tweu- ty tens capacity daily, lu fact there are three mines in this district, inc Comet, the Stonewail and Mike Mccoy mine which, with very little develop ment, would yield that amount of ore. 4 steady supply is the first requisite of success Provided this were oU- tained, the rational treatment by roll crushing, roasting and hzivistiou, would leave aJouy slC net profit from % ounge ore, alI5wing s per ton for transportation from tue mine, aAd with silver at 924 cents, winch, when divided between mine and mn, would give each s per ton, whereas, al pres ent such ore would leave .ho nInar in l debt to the mill to that amount
 Where lixiyiation eau be praeticNd on raw ore, the result is still more rs- voraJla, but th,s seldom rLe ease In fact, what many miners see fl 10 call free milling ore, is nearly always roasting ore.
 We thiak it entirely within bounds to say that twenty ton mIilin Globe, could 5e supplied win ere averaging 40 ounces. If miners had seme assur- i ance that they would come out whole | on the transaction, there would be no difficulty in obtaining a sufficient ore supply. The advantage of reasoua- ble profit and quick return which sell 1 conducted reduction works, coupled ! with sampling works, would offer to miners, would insure the rapid dsvel- opment of the silver mines of this dis tr.ct, and rebound to the benefit Of Globo far more than a railroad, or any other enterprise that could be in- auguratod here, The capital required | for the building of such works is small, and the investment would undoubted- ly prove exceedingly profitable,