Holding the pilot and the case firmly together with one hand, guide the cutter into the flash hole, and then push down and rotate the handle until you feel the cutter shaft bottom
5, a 55-year-old contract miner received fatal injuries when he was pinned between a pneumatically powered air lock equipment door and the concrete rib barrier located near the shaft bottom
The orebodies Vale is targeting are close to the South Shaft and descend to the 5,200-foot level, requiring ramp infrastructure below shaft bottom
. Without a refurbished shaft, ore ould have be trucked nine kilometres to the North Shaft.
They proposed that the "cross passage parallel shaft construction" method was better adapted to the good geological condition under the shaft bottom
and discussed the superiority of the method.
The modular structure consists of an entrance cone, shaft ring, and shaft bottom
, frequently adding up to an overall height of several meters.
The beginning of the blind shaft bottom
was always taken as the first measured horizon.
And, some cite a 2000 Formal Interpretation (#2/710/00) of a very similar, but now-obsolete, 1999 BOCA Code clause not allowing a rated damper on the horizontal underside of a shaft bottom
When the hot smoke reaches the shaft bottom
in the stage of flowing horizontally, the stack effect takes place, and then smoke will be exhausted from the shaft.
This was the time when the miners, on reaching the shaft bottom
at the start of a shift, would sit in a circle swapping yarns and chatting before starting work.
He would use various bells to signal to the hauler man to take the tubs to the shaft bottom