Details of Practical Mining
Details of Practical Mining
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In our eReader you can find the full English version of the book. Read Details of Practical Mining 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 Details of Practical Mining
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Posts (sets 1 and 2 shown in the plan Fig. 161). Next, the slice was extended along the caved ground putting in 7 X 12-ft. Drift sets spaced about 5 ft. Apart for about 25 ft. , which was the limiting dis- tance on that side. Then the ore above the last sets, 6 and 7, was taken out and 7 X 8-ft. Sets were put on top of the 7 X 12-ft. Sets already in place. This top tier was then worked back to the open set. The caps of the bottom sets were framed on top to make a bearing for the posts of the to...p sets. Seven sprags were used between posts and caps of the Caved Ground I 3 4 i 6 7 X / / ^ Irack- a.
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9 5 Plan Side ElevcrHon FIG. 161. UNSATISFACTORY METHOD OF TOP-SET SLICING.
top sets as shown in the elevation. The next step was to make room for sets designated in the plan as 8 and 9; this time, the full height of the ore was taken out and both top and bottom sets were put in. In taking out the ground adjacent to 9, for the next set, the side weight of the unsupported caved ground caused set 5 to move and although the miners tried to hold it with props, they could not stop its moving and the set "jacked-knifed, " the end of the room filling with sand.
What to read after Details of Practical Mining?
You can find similar books in the "Read Also" column, or choose other free books by Daw, Albert W. (Albert William) to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Posts (sets 1 and 2 shown in the plan Fig. 161). Next, the slice was extended along the caved ground putting in 7 X 12-ft. Drift sets spaced about 5 ft. Apart for about 25 ft. , which was the limiting dis- tance on that side. Then the ore above the last sets, 6 and 7, was taken out and 7 X 8-ft. Sets were put on top of the 7 X 12-ft. Sets already in place. This top tier was then worked back to the open set. The caps of the bottom sets were framed on top to make a bearing for the posts of the to...p sets. Seven sprags were used between posts and caps of the Caved Ground I 3 4 i 6 7 X / / ^ Irack- a.
_ 1 tfr
9 5 Plan Side ElevcrHon FIG. 161. UNSATISFACTORY METHOD OF TOP-SET SLICING.
top sets as shown in the elevation. The next step was to make room for sets designated in the plan as 8 and 9; this time, the full height of the ore was taken out and both top and bottom sets were put in. In taking out the ground adjacent to 9, for the next set, the side weight of the unsupported caved ground caused set 5 to move and although the miners tried to hold it with props, they could not stop its moving and the set "jacked-knifed, " the end of the room filling with sand.
What to read after Details of Practical Mining?
You can find similar books in the "Read Also" column, or choose other free books by Daw, Albert W. (Albert William) to read onlineMoreLess
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