Relazione sulla geologia della Carolina del Sud; . e il miglior trattamento da parte di altri processi, wherea grandi quantità può essere macinato in un breve periodo di tempo. Per far amalgamare la oro, dopo la macinazione in Arastre, acontrivance, rappresentata in Fig. 46, è stato utilizzato in San Catharines Mill, North Carolina. Il levigato minerale è stato collocato nel cilindro, ed un flusso di acqua ammessi per il flusso in. L'assale centrale, con i suoi bracci, sono stati fatti ruotare, per mezzo del quale tutta la isagitated. Le particelle più fini pass off, l'oro e scende verso il basso e viene preso dalla mercuryplaced nella canna. Un'altra macchina resta da esaminare, w

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Report on the geology of South Carolina; . e best treated by other processes, wherea large quantity can be ground in a short time. For amalgamating the gold, after grinding in the Arastre, acontrivance, represented in Fig. 46, was used in St. Catharines Mill, North Carolina. The levigated ore was placed in the barrel, and a stream of water allowedto flow in. The central axle, with its arms, were made to revolve, by which means the whole isagitated. The finer particles pass off, and the gold falls down and is taken up by the mercuryplaced in the barrel. Another machine remains to be examined, which was once in use in South Carolina, but nowabandoned : I mean the Tyrolese Mill, (Fig. 47.) The ore was placed in the hopper, «, from whichit passed to the stamps, b. After being crushed by the stamps, in contact with water, it passed into 284 GEOLOGICAL SURVEY a series of bowls, one revolving within the other, and placed so that the ore could pass from onepair of bowls to the next, until tiie grinding and amalgamation was completed.. These are all the machines that are in use in the gold regions of the Southern States; and per-haps if they were well constructed and properly managed, they would leave little to be desired; butit is quite certain that a considerable portion of the gold is lost. This is rendered evident by the dif-erence between all the assays made and the actual amount collected, as well as by the gold almostinvariably found below the mill, and which must have escaped. This has led some to direct their attention to the probability of discovering some process of smelt-ing, which might obviate this difficulty. Smelting is practiced in Europe, but only with rich auri-ferous sulphurets. Those are roasted and melted into mattes, which are again roasted, and fusedwith lead ; the gold is taken up by the lead, from which it is separated by cupellation. But eventhis is considered uncertain, and but little practiced. Poor iron ores, containing gold, have beensmelted i

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• bookcentury1800
• booksubjectgeology
• booksubjectzoology
• bookyear