pillar extraction

pillar extraction

[′pil·ər ik′strak·shən]
(mining engineering)
Removal of the pillars of coal left over from mining by the pillar-and-stall method. Also known as pillar mining.
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Tenders are invited for drilling of 10m long 27mm dia upwards holes in sand stone roof for installation of single point auto warning telltales for routine safety monitoring during pillar extraction in depillaring 4w and 9w panel at bijuri colliery
The predominant method of mining was by drift and shaft mining, although some pillar extraction data has been included.
Later on, the prediction accuracy of electromagnetic radiation was estimated by applying it to predict the rockburst during isolated coal pillar extraction.
Now UK Coal bosses are hoping that the revised bid - which takes into account 70 redundancies at the pit and the axing of loss-making bord and pillar extraction operations - will secure a bigger slice of the state aid cake.
The method would ideally require a previously un-mined area, as pillar extraction may lead to a domino effect and the potential for uncontrolled collapse.
Tenders are invited for Making of 78 nos of 10m long 27mm dia upwards holes in sand stone roof,for installation of single point auto warning telltales,for routine safety monitoring during pillar extraction in depillaring panel kcms-2a in seam-c at kapildhara ug mine of hasdeo area.
These included retaining the 70 jobs and the bord and pillar extraction seams, together with a longwall face.
Room-and-pillar mining will be used, followed by pillar extraction and backfilling, to extract the upper 8 m wide zone.
The Journal understands that Ellington, which was expected to make a pounds 4m profit this year, is likely to record a pounds 6m loss because of serious production problems which will result in the ending of its loss-making bord and pillar extraction operations early next year.
Pillar extraction in Vertical Crater Retreat mining is the key to productivity and future production.
Pillar extraction is usually carried out by similar methods between cemented, hydraulically placed fill walls made from mill tailings.
After sections are developed, stooping (pillar extraction and bottom coaling) takes place, in which the continuous miner retreats, recovering around 10 m of coal from the floor.