Background to the project:
Outokumpu made a large expansion of its mining operations and a number of shafts for ventilation were to be drilled
Shaft:
18 ventilation shafts between 45-589m in 3.5-4.5m diameter with varying inclination between 60-90 degrees
Performed by rig:
Epiroc Robbins 123RH
Rhino 2000