Show new milling P plant lan t of r Roh rochester c estr e mines mi ines company A special from fr om rochester roches ter nevada N to the deseret news of salt lake gives the following brief description of the now new milling plant of the rochester mines company of rochester nevada although maintaining a splendid record of efficiency exceeding its daily estimated capacity of twenty five tons the mill of the each day in bullion the last and fifth snip ment of fifty one bars leaving yesterday this amounted to about and brings the total bullion shipped since the mill first started to approximately experts who have watched this mill in operation and noted the extraordinary savings baft being g accomplished have pronounced ina in A W 7 7 caf p inal P byg 4 aj a oa V 41 t 6 7 S i M WK WM M t E 7 z N av J NM 7 nil rr jve t aw rochester mines company which has been running at high tension in rochester canyon since late in april finds itself for the first time flooded with ore from rochester hill and cannot keep with up the pace set by the leaders leasers leas rs or the possible production in the new company companas comp anys s new workings however the plant is turning out nearly 2000 this one of the most perfect plants p al ts ever erected in nevada it is a 10 stamp and cyanide mill tile the process being continuous countercurrent counter current decantation by means of dorr equipment aln i extraction of values being made entirely by the use of cyanide solution the mill is situated in rochester canyon a mile below lower rochester and nearly three miles from the mines on rochester hill it is now connected with tha mines by means of the nevada short line narrow gauge ore road and it is expected that trains will be in operation within a few days relegating the faithful mules and horses to the past history of rochester plant of tho the the now new milling A brief review of the process of ore treatment may be interesting because of the simplicity and ease with which the gold and silver values are recovered from the bins where the ore will now be dumped from the railroad cars it Is 19 drawn off and crammed a short distance the mill to the big crusher which is the in I 1 fitial step in the process of turning the g gold oh 1 and d silver in the ore into bullion all the 1 machinery is driven by electric power with individual motors for the various sections t it may be remarked by the way that eliat this i power comes eighty five miles over the lines of the nevada valleys power company from the big government dam at La honton after going through the crusher the ore goes up an all elevator and through the sampling system which automatically cuts out one tenth of the total amount crushed the n 3 UZ wj rj I 1 E 7 1 RA V U mg COrn pany rochester nevada remainder passing into the bins from which the stamps are fed the sample cut passes into another portion of this department ment where it is ground finer and botill further cut down until at last a comparatively small all amount of finely ground ore is segregated for assay to determine the values per ton from the stamps the ore passes to dorr classifiers thence to the two tube mills for pulverizing then into a series of cyanide tanks thickeners agitators filters etc the gold and silver in the ore being constantly extracted through this process until the solutions 0 finally reach the vats in anich the values are precipitated on zinc shavings the dough when taken from the vats contains in weight about 75 per cent gold and silver which is finally reduced to bars and bullion weighing from fifty to sixty 4 T apte 7 Y ra ill x M 4 M 1 ruah 4 66 TZ ita mb zi ap LZ courtesy Cour lesy of If estern nevada pounds and valued at about a bar these bars are shipped to the smelter at selby and there refined |