File:Transactions (1871) (14596914077).jpg

Identifier: transactionsmining31amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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earSalt Lake Citv was: Per cent. Zinc, 40.00 Lead, 8.00 Iron, 4.00 Silica, 20.00 Sulphur, 28.00 and 6 oz. of silver per ton. The present manager estiimthat he has 800,000 tons of zinc-ore in sight. It is said toextend nearly down to the 10th level. Copper is said to have been seen first at a depth of 650 ft.:and it extends down to 750 ft., but is not found at 800 ft. Asseen on the 7th level the ore is largely chalcocite, with a gooddeal of galena scattered through it. This bodv of ore was firststruck in running a drift around the caved ground, after goingthrough what had formerlv been taken for the hanging-wall ofthe ore-shoot. The body of copper-ore thus struck has consti-tuted the principal wealth of the mine in recent years. It issaid to be from 2 to 5, or even 20 ft. thick, and up to 200 ft. inhorizontal length. It apparently rests directly on the chert or4- rhyolite, somewhat as indicated in the section (Fig. 10). r,si> UN: DELAMAR AND THE HORN-SILVER MINES. Fig. 10. Xew Shaft
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Scale I ■ i i i i i i i i i i i i I o too zooft. E.-W. Section of Horn-Silver Mine. Shipments of copper-ore from this body are said to have aver-aged 25 per cent, of copper, and in some cases to have run ashigh as 40 per cent. Although no ores of copper or zinc are WOIIX \mi I 1: i\ l in BL ICK mi.i - i 301 in D \ki L I Bald to have been found in the lower levels, tli< walls of thedrift running through the chert, which forme a large proportionof the fault-material on the 11th Level, were observed to becovered with chalcanthite, and in some cases with goslarite.The latter material is very abundant, in unusually long, fibrous,silky clusters, throughout the lower levels of the mine. It is thus evident that this mine presents an unusually fineinstance of secondary enrichment in the middle levels by zincand copper minerals which have been leached down from theupper part of the deposit as decomposition and erosion havegradually progressed. The mine is essentially a dry one, butnot bo e

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