A Practical Manual of Minerals Mines And Mining Comprising Suggestions As to
A Practical Manual of Minerals Mines And Mining Comprising Suggestions As to
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In our eReader you can find the full English version of the book. Read A Practical Manual of Minerals Mines And Mining Comprising Suggestions As to 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 A Practical Manual of Minerals Mines And Mining Comprising Suggestions As to
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The size of these pillars depends upon the nature of the roof and the solidity of the floor.
The taking out of the pillars begins when the levels, or drifts, have reached the end of the bed, or the extent of the field to be worked, or exhausted portions of the mine, or in general arrived at the predetermined limits. The beginning is made at the point farthest removed from the main or work- ing shaft or gangway, and the work proceeds towards this shaft or gangway, so that the roof may be allowed... to crush in without interfering with transportation and ventilation, and the workings still be carried on in other portions of the mine.
FIG. 48.
PLATE IX.
FIG. 49.
FIG. 50.
FIG. 51.
To face page 294.
STRATIFIED DEPOSITS AND BEDS. 295 The separate pillars are taken one after another, beginning with the upper one and proceeding down in the direction of the dip. Before this is commenced and while it is going on, the roof has to be supported either by timbers or dry walls. As soon as one pillar has been taken away and the materials composing it removed, the timbers supporting the roof are carefully taken away, provided it can be done without danger, otherwise they are abandoned and the roof is allowed to fall.
What to read after A Practical Manual of Minerals Mines And Mining Comprising Suggestions As to?
You can find similar books in the "Read Also" column, or choose other free books by Henry Stafford Osborn to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The size of these pillars depends upon the nature of the roof and the solidity of the floor.
The taking out of the pillars begins when the levels, or drifts, have reached the end of the bed, or the extent of the field to be worked, or exhausted portions of the mine, or in general arrived at the predetermined limits. The beginning is made at the point farthest removed from the main or work- ing shaft or gangway, and the work proceeds towards this shaft or gangway, so that the roof may be allowed... to crush in without interfering with transportation and ventilation, and the workings still be carried on in other portions of the mine.
FIG. 48.
PLATE IX.
FIG. 49.
FIG. 50.
FIG. 51.
To face page 294.
STRATIFIED DEPOSITS AND BEDS. 295 The separate pillars are taken one after another, beginning with the upper one and proceeding down in the direction of the dip. Before this is commenced and while it is going on, the roof has to be supported either by timbers or dry walls. As soon as one pillar has been taken away and the materials composing it removed, the timbers supporting the roof are carefully taken away, provided it can be done without danger, otherwise they are abandoned and the roof is allowed to fall.
What to read after A Practical Manual of Minerals Mines And Mining Comprising Suggestions As to?
You can find similar books in the "Read Also" column, or choose other free books by Henry Stafford Osborn to read onlineMoreLess
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