Transactions of the American Institute of Mining Engineers Volume . 25
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...other sources, they are not of uniform grade and purity; and considerable variations in percentages of objectionable impurities will be found in successive lots of ore from the same mine. On the other hand the magnetic concentrate from a particular mine will always be practically uniform, whatever the variations in the crude ore from which it is extracted; and its richness will be equal to that of the very best of native ores. The separator, therefore, is an available means to aid the manufacture of better, as well as cheaper, iron. Since 1888, many plants for crushing and separating iron-ore have been projected, and a considerable number have been put in operation. Among the first in point of time and absolutely first in the technical and commercial success of the operation was the plant of the Magnetic Iron Ore Company, at Benson Mines (formerly known as Little River), St. Lawrence county, N. Y. At that place, for the first time in the history of the art, magnetic separation was successfully resorted to on a commercial scale, as a means of treating a low-grade, non-Bessemer ore to eliminate deleterious impurities and render it fit for steel, making. Prior to 1889, the Magnetic Iron Ore Company had expended a large amount of money in building a railroad to the mines at Jayville, N. Y., developing them and securing the property at Little River, before it was finally discovered that ore of good quality, in its natural state, could not be taken from the mines in paying quantities. It was therefore decided by the company that the only thing to be done, to save the investment in these properties, was to establish a large concentrating plant at Little River--now Benson Mines--and to extend the railroad to that point. There exists, at that...
- 189 x 246 x 20mm | 671g
- 13 Sep 2013
- United States
- black & white illustrations