File:Transactions (1871) (14590116310).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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the deposit,through which the water is collected and pumped to the sur-face. A great deal of ore has been taken out of this cut. Lastyear the output was 808,291 tons. The Auburn Mine.—As an example of the mines employingunderground mining combined with stripping, I have selectedthe Auburn mine. This method of extraction is locally termedthe milling system. Fig. 14 is a plan of the underground openings. Thus far, twolevels have been opened out; the first level having about 65feet of ore over it, and the second about 60 feet. The firstlevel was laid out on what may be called the diagonal plan. A 362 METHODS OF IRON MINING IN NORTHERN MINNESOTA. main drift was run straight out from the bottom of the shaft,and from this the branch drifts were opened at an angle of 45°.All the drifts were timbered. From all of the drifts raiseswere carried up to the top of the ore, which had been previ-ously uncovered. The amount of stripping done in 1895 is in- Property Line and Limit of Stripping 189S
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Scale of Feet0 20 -10 60 SO Average Depth of Stripping Area of Ore Uncovered 175,000 square feet 1st. Level2nd. Level a Raises■ Raises Fig. 14.-Auburn Mine, Minnesota Iron Co., Mesabi Range. dicated on the map. The stripped area has since been increased,and now reaches nearly to the shaft and extends over the driftsin the northeast corner of the mine. The second level wasopened on the rectangular plan, that is, the branch drifts wererun at right angles to the main drift from the shaft. METHODS OF IRON MINING IN NORTHERN MINNESOTA. 363

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