Arizona silver belt., 1878-08-15
How They Extract Silver from Ores in the old
 ss Country.

Processes for extracting silver from ores are very numerous, and differ with the nature of the ore aud ste surrounding localities. Some processes which are admirably adapt ed for one locality may not De it at all for others, and therefore judicious selections have to be made for differ ept mining localities out of those many silver extraction methods we are over flooded with to-day And here 1t IS, especially Germany and her sayants to whicl great credit is due for the many improved processes ln metal.urgy over winch We cola- mand now, and by winch we are el,- abled to attain with an insignificant cost by far more satisfying results than by, the tune hOnored, now in Germany entirely discarded, quick silver amalgsmation and many other processes
 Those methods nos in successful operation throughout the old world consist chiefly dn uslng solutions for dIssolying and preclpitatIng out u the solutions the desred metals. asd have been termed Llxivicaslon Pro cesses
 One of the oldest of these IS :. Augusune'sn salt lIxivlcauon, and ls based on che fact that chloride of silver, either as found in nature or produced by roasting silver ores with salt, IS entirely soluble A a concel- trated solution of salt. Teis facf WAS discovered as early as lo5z, and in 1845 did Augustine utlllze this discovery, by introducing ais new process for extracting chloride of silver by means of salt, and precipl- tatlng the silver from this solution by metalIc copper in the form of cement sllyer, winch by smeltlng in a cruclble becomes metallic silver. A process Which soon proved to be ever So mucn cheaper than amalganation, not connected with any danger to the health of the laborers, and which at the same time admitted of extracting all other metals contained In the ore, while the percentage of silver brought out was higher than ln any of the old time methods and the cost Insighi6- cant. No expensive machinery was necessary, for all be used vas 3 roaster and tub.
 A second process for such silver ores which contain rather much cop per is furnished m the so-called 'Copperstone Extraction Process. 1" The ore reduced to fine granules IS subjected to roasting in the tres air, which is to be followed after the ad- dition of one to SIX per cent. salt ,o a second finishing roasting. Tbe silver which xas contained in the ore combined with copper has now De- come 8 chloride of silver, which IS treated in conformity to the Angus tine process.
 The cheapest of all, but not always applicable process. IS "Ziervogels 8 Wi.ter LixIvlation. " The silver ores to be worked by this process have 10 contain g high percentage of sulphur, copper, and small one of iron. By simpsy roasting tue ores she therein contained silver forms 9 yitrol of silver. For the heat applied to the ore has disengaged sulphuric acid which attacks the silver and brings t into state of silver Wtrol, winch is perfectly soluble in water mixed with 3 little sulphuTic acid and g copper bar ls then all shat is needed to pre- cipitAte the silvsr.
 A fourth and 6fth means of sx- tracing chloride of ailyer, (which not to be forgotten is alEAya formed by roasting the ore vita salt, is found in the solaech of oithe5 sab4 salpbsss cf spde e sab-sglphate of liRs, as advised by PAisga snd Kiss. RisAer method hes she aaFanksk ks loFss cOacenrasea soluaen of sal tAat is disa0lvm chloride of silgsg kal mors rsaei!y. Bslidss is tAs buik q
 tAe liqpids D fer snsliw Of 'kAics