Annual Report of the Geological Survey of Pennsylvania, Part 4
Annual Report of the Geological Survey of Pennsylvania, Part 4
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In our eReader you can find the full English version of the book. Read Annual Report of the Geological Survey of Pennsylvania, Part 4 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 Annual Report of the Geological Survey of Pennsylvania, Part 4
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1403 cement roof is so favorable to this system of mining that the loss of ore in the mine is inappreciable. As fast as the gangway advances the breasts are worked up and as they rise above the gangway level carefully timbered chutes are carried up as manways and also as roll ways for the ore. In the low dipping workings of the Prince Manufacturing Company's Mine No. 4, and the Bowman mine a similar system is observed (modified to suit the dip), the only dif- ference in mining being in the nece...ssity for additional timbering and in the fact that the miner works on the bot- tom clay of the bed while the gob is piled on either side as the breast advances. In all cases a monkey gangway is carried along the face of the breast and air holes driven to the surface at intervals. The refuse clay is packed so tightly in the gob of the breast that there is no leakage of air and to a very complete and simple system of mining is added that of an equally simple and successful system of natural ventilation.
What to read after Annual Report of the Geological Survey of Pennsylvania, Part 4?
You can find similar books in the "Read Also" column, or choose other free books by Pennsylvania. Geological Survey to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
1403 cement roof is so favorable to this system of mining that the loss of ore in the mine is inappreciable. As fast as the gangway advances the breasts are worked up and as they rise above the gangway level carefully timbered chutes are carried up as manways and also as roll ways for the ore. In the low dipping workings of the Prince Manufacturing Company's Mine No. 4, and the Bowman mine a similar system is observed (modified to suit the dip), the only dif- ference in mining being in the nece...ssity for additional timbering and in the fact that the miner works on the bot- tom clay of the bed while the gob is piled on either side as the breast advances. In all cases a monkey gangway is carried along the face of the breast and air holes driven to the surface at intervals. The refuse clay is packed so tightly in the gob of the breast that there is no leakage of air and to a very complete and simple system of mining is added that of an equally simple and successful system of natural ventilation.
What to read after Annual Report of the Geological Survey of Pennsylvania, Part 4?
You can find similar books in the "Read Also" column, or choose other free books by Pennsylvania. Geological Survey to read onlineMoreLess
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