Tenders are invited for Construction Of Sidewall To Prevent Spalling Of Shaft Pillar
As Well As To Strengthen The Girder Support Against The Roof At No 7 Pit Bottom In Narainkuri Seam (R -Vii) Of No 7 Pit Amkola Unit Under Nimcha (R) Colliery.
The overall direction of mining is from the shaft pillar
outwards, moving from raise line to raise line out toward the boundaries.
Sectionlisation Stopping Beside Shaft Pillar
At Sonachora (R-Viiib) Seam, No.
By August 1992, development on the Ventersdorp Contact Reef in the South Deep shaft-pillar area was completed, this allowed the stoping of the reef and stabilisation of the shaft pillar
ahead of shaft sinking operations.
Whichever is chosen, some ore will be sterilized by a shaft pillar
Because the strata is not disturbed by blasting it should be possible to leave smaller shaft pillars
which at present often sterilize considerable tonnages of ore.
Considerable tonnages of coal left in shaft pillars
are now being recovered by open-pit methods.