Henderson Mine Site. Henderson Mine. Shaft Collar Elev 10,400 ft. Harrison Mt. Elev. 12,300 ft. Shaft Bottom Elev 7,500 ft. LA Ramp. Exhaust air. Fresh air. To crusher. Primary Access Ramp 3600 ft. Secondary Access Ramp 3200 ft. Central Campus Elev. 6,750 ft (4200 mwe).
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Basic drilling cycle for drill and blast drifting and tunneling:
Rock World, 2/2001
Drilling the ventilation raises at the Kiruna Mine, 1998
Raise bored pilot hole 1.8 to 2.4 m diameter.
Ream shaft to up to 8.5 m diameter.
Limited by maximum length raise bored hole, currently 1,300 m.
7.5 m day average