The Copper Mines of Lake Superior
The Copper Mines of Lake Superior
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In our eReader you can find the full English version of the book. Read The Copper Mines of Lake Superior Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Copper Mines of Lake Superior
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By driving the main Digitized by Google OF LAKE SUPERIOR. 95 < I M Digitized by Google 96 THE COPPER MINES levels to the boundary or to the known limit of the body of copper rock, and then stoping backward toward the shaft, the ground could be allowed to cave; the track could be taken up; the interruptions to traffic due to intenrening stopes would be avoided; and, at the same time, communi- cation, when established between two levels, at those ends farthest from the shaft, would stimulate ventilation. At the Atlantic it was stated that such a plan would render a level non-productive until its full length had been driven; but, surely, in a mine with thirty working faces, one can be spared for a time by increasing the extraction at some other place. Once the drift is completed, the extraction at any single level ought to be more rapid if commenced at the end farthest from the shaft. In the Calumet & Hecla, the drifts are extended from shaft to shaft, stoping being started midway and extended in both directions simultaneously.
What to read after The Copper Mines of Lake Superior?
You can find similar books in the "Read Also" column, or choose other free books by T a Thomas Arthur Rickard to read online
To quickly assess the difficulty of the text, read a short excerpt:
By driving the main Digitized by Google OF LAKE SUPERIOR. 95 < I M Digitized by Google 96 THE COPPER MINES levels to the boundary or to the known limit of the body of copper rock, and then stoping backward toward the shaft, the ground could be allowed to cave; the track could be taken up; the interruptions to traffic due to intenrening stopes would be avoided; and, at the same time, communi- cation, when established between two levels, at those ends farthest from the shaft, would stimulate ventilation. At the Atlantic it was stated that such a plan would render a level non-productive until its full length had been driven; but, surely, in a mine with thirty working faces, one can be spared for a time by increasing the extraction at some other place. Once the drift is completed, the extraction at any single level ought to be more rapid if commenced at the end farthest from the shaft. In the Calumet & Hecla, the drifts are extended from shaft to shaft, stoping being started midway and extended in both directions simultaneously.
What to read after The Copper Mines of Lake Superior?
You can find similar books in the "Read Also" column, or choose other free books by T a Thomas Arthur Rickard to read online
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