File:Transactions (1871) (14590186489).jpg

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Identifier: transactionsmining27amer (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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ep water from freezing on the rails and skip. The topof the Fayal pocket is 40 ft, and the head-sheave axis 65 ft.above the ground. The main timbers are 12 by 12 in. Themaximum height of stock-pile is therefore 40 ft, At othershafts of the same company, the height of pockets is about 34 ft, Stock-piles are made long and narrow, and are built up bydumping over the end, and not over the sides, as by so doingthe stock-pile increases too fast to freeze hard. Stock-pilesthat have frozen during the winter cause a good deal of troublein loading by steam-shovel in the summer. The hoisting-planthas two 18 by 42-in. cylinders, operated by Corliss valves with-out cut-offs, which are directly connected to a 6-ft. drum, fastupon the shaft. The plant was made by E. P. Allis. Thehoisting-rope is a 1-inch Lang-lay rope, made by Roebling. A special feature of the Fayal mine is the use of timber-slides for getting timber into the mine. Fig. 23 shows the 382 METHODS OF IRON MINING IN NORTHERN MINNESOTA.
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fc METHODS OF IRON MINING IN NORTHERN MINNESOTA. 383 bottom of one of these slides, which are made by putting upraises to the surface, 5 by 5 ft. in section, and equipping themwith skid-ways, down which the timber is allowed to slide.The skid-ways are curved at the bottom, to diminish the veloc-ity of the timber. The angle of the first slide was 45°; butthe later ones were put at 38°, which is considered to be aboutthe best angle. The men are made to travel in and out of the mine throughinclined raises specially prepared for them, so as to lessen thechances of lire in the main shaft. The Genoa Mine.—This mine is just being developed. Dur-ing the past year 17,136 tons of ore have been taken from theopening drifts. Fig. 24 shows the present condition of themine. The execution of the work has been of the same highorder as at the Fayal. The shaft is like those of the Fayaland Auburn. It is sunk on land owned in fee; but the firstmining will be confined to ore held under lease. The bul

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Author American Institute of Mining, Metallurgical, and Petroleum Engineers
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29 July 2014

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