Mining Without Timber
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In our eReader you can find the full English version of the book. Read Mining Without Timber 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 Mining Without Timber
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89. These holes, after being blasted, form a mill-hole around the raise. In this way the ore is drawn off with the occasional use of a small amount of powder. The chute planking comes out with the ore. The short pieces are usually unbroken, while perhaps 50 per cent, of the side pieces are unbroken and can be used again. By this means all the ore is drawn from the section and the small pillars are left standing.
MINING THE PILLARS The pillars crush down and break, due their own weight and a few... small slips that usually exist in this class of porphyry ore. In case a pillar does not break down, a drift is run on the level underneath it and These Drifts carried . Up to Level above cutting out Pillars The Engineering $ Mining Journal Fio. 88. Plan of stope, -16 ft. Above level. 'Duluth mine.
a raise is run up a short distance into the bottom of the pillar. One side of this raise is filled with holes, the base of the pillar is blasted out and the pillar falls. From this drift a new set of inclined raises in the bottom 16-ft.
What to read after Mining Without Timber?
You can find similar books in the "Read Also" column, or choose other free books by Robert Bruce Brinsmade to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
89. These holes, after being blasted, form a mill-hole around the raise. In this way the ore is drawn off with the occasional use of a small amount of powder. The chute planking comes out with the ore. The short pieces are usually unbroken, while perhaps 50 per cent, of the side pieces are unbroken and can be used again. By this means all the ore is drawn from the section and the small pillars are left standing.
MINING THE PILLARS The pillars crush down and break, due their own weight and a few... small slips that usually exist in this class of porphyry ore. In case a pillar does not break down, a drift is run on the level underneath it and These Drifts carried . Up to Level above cutting out Pillars The Engineering $ Mining Journal Fio. 88. Plan of stope, -16 ft. Above level. 'Duluth mine.
a raise is run up a short distance into the bottom of the pillar. One side of this raise is filled with holes, the base of the pillar is blasted out and the pillar falls. From this drift a new set of inclined raises in the bottom 16-ft.
What to read after Mining Without Timber?
You can find similar books in the "Read Also" column, or choose other free books by Robert Bruce Brinsmade to read onlineMoreLess
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