A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . achine is in operation, the oreflows over at f, into the launder beneath it,whilst the waste is carried over the opposite endinto the trough e. Prof. B. Silliman, Jr., and Mr. J. D. Whitney,give the following particulars of results realizedby this machine :—The total weight of ore stuffpressed during 122 days was 11,948,900 poundsof rock stamped and crushed, or 5,080 tonsminers weight. The total ore sold from this quantity of stuffwas 128 gross tons, (2,352 lbs.
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . achine is in operation, the oreflows over at f, into the launder beneath it,whilst the waste is carried over the opposite endinto the trough e. Prof. B. Silliman, Jr., and Mr. J. D. Whitney,give the following particulars of results realizedby this machine :—The total weight of ore stuffpressed during 122 days was 11,948,900 poundsof rock stamped and crushed, or 5,080 tonsminers weight. The total ore sold from this quantity of stuffwas 128 gross tons, (2,352 lbs.) or 2Vino per cent,of the stuff worked over. By the Captains vanstlie average richness of the stamp work (formingmuch the larger part of what goes to the separa-tors) for 22 weeks was 2*32 per cent. The humidassay of the average work from the stamps forfive weeks in July and August, gave for the rich-ness of the stuff dressed on the separators 328per cent, of ore, or -984 per cent, of metallic copper. There is, therefore, an apparent lossin the tailings of /loo per cent, of 30 per cent, ore, or ^Vioo of copper. The amount of. ORES, DRESSING OF. 879 ore, however, lost in the tailings does not exceed */io to 7io per cent., or about /loo percent, of copper. The actual products of working, therefore, as may be seen, exceed for themachines the average richness of the Captains vans. Of the total ore produced in this time, 181,126 pounds came from the separators, and160,858 pounds from the jiggers. The whole amount of stuff, therefore, required to pro-duce this amount of ore, estimated from the above ratio ( : 1) is 768,680 may be taken approximately as the actual quantity which passed over the separators,and if calculated on the Captains vans, it should have produced 177,061 pounds of ore,while in fact it did produce 181,126 pounds, or a variation in excess for the machines ofonly 3,210 pounds. Each of the separators, therefore, dresses about 1^ tons of rock daily,
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
