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coal is mined in a series of rooms cut into the coalbed. Pillars of unmined coal are left intact, and serve to support the mine roof, as miners advance through the coal seam.
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∙ 13y ago
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What is a four-sided stone pillar?
Obelisk
How many syllables does pillar have?
Two syllables. Pil-lar.
Where can you find a four sided pillar that is pointed at the top in the US?
The Washington monument
Is strip mining have positive or negative effects?
Most of the times, strip mining has positive and negative consequences. Usually, the viewers get the positive aspect of strip mining, and the performers are affected by the loneliness and long nights of working 12 hour shifts. Err, my sources say that it's actually not that lonely, and the pay is good.... So, I guess strip mining is only positive.
Where did 3m get its name?
Minnesota Mining and Manufacturing Company
What is a pillar mining?
Room and pillar mining is when pillars of rock are left standing to support the roof. Between the pillars, coal or ore is cut out and removed leaving spaces known as rooms.
What has the author Larry E Green written?
Larry E. Green has written: 'Comparative shortwall and room-and-pillar mining costs' -- subject(s): Pillaring (Mining), Mining engineering
What are the benefits of cast mining compared to underground mining?
Underground mining is very expensive, and "room and pillar" methods only permit removal of a portion of what is being mined- something had to hold up the roof.
What has the author P W Kauffman written?
P. W Kauffman has written: 'Room and pillar retreat mining (a manual for the coal industry)'
How is lomgwall mining superior to pillar mining?
Safer, more productive, more economical.
What is meaning of board in board and pillar system of mining?
It should be bord and pillar, but for some reason it has been used as board and pillar. IMO it was a mistake but carried through now.
What has the author A A Campoli written?
A. A. Campoli has written: 'Coal mine bumps' -- subject(s): Coal mine accidents, Rock bursts 'Control of longwall gob gas with cross-measure boreholes (upper Kittanning coalbed)' -- subject(s): Boring, Coal mines and mining, Firedamp, Mine ventilation, Safety measures 'Performance of a novel bump control pillar extracting technique during room-and-pillar retreat coal mining' -- subject(s): Coal mines and mining, McDowell County, Pillaring (Mining), West Virginia
Where is the mining master at in runescape?
In falador, either through the mining guild or through the room next to the party room, then walking to the gate.
Where is the Mining Room in Professor Layton and the Diabolical Box?
Please see Related link below for a walkthrough on how to get to the Mining room in Pandora's box.
What has the author Christopher Mark written?
Christopher Mark has written: 'Roger Smalley' -- subject(s): Composition (Music), Criticism and interpretation, History 'Pillar design methods for longwall mining' -- subject(s): Longwall mining, Pillaring (Mining)
What has the author Michael H Matsumunyane written?
Michael H. Matsumunyane has written: 'Design of pillars in post pillar mining'
Why would you use one type of mining over another type of mining?
Because one type of mining may not be possible, may not be safe, or may not be economically feasible. Underground room-and-pillar mining for coal can only remove about 30% of the coal present, and requires a fairly thick seam of coal. Surface mining requires removing overburden that is covering the mineral you are mining- if that overburden is 500 ft thick, you could not afford the expense of moving that much rock. The Homestake gold mines were about 8000 ft deep- and followed the path of veins of high grade ore. Different geology, different needs.
