RUC Cementation Mining Contractors has modified their fleet of Robbins 61R Raisebores to create a 'low profile' rig. This allows the Robbins 61R to operate in more confined spaces, where height restrictions prevent other equipment from operating.
Specifications:
- Raise Diameter: Up to 2.1 meter nominal diameter
- Raise Length: 100 meters
- Pilot Hole Diameter: 11" Tri-cone bit size
- Drive Type: Hydraulic Drive
- Drive Speeds: 0-24 rpm
- Ream Speeds: 0-6 rpm
- Pilot Thrust: 109 tonnes at 24 MPA
- Reaming Pull: 230 tonnes at 27.5 MPA
- Vertical Drilling: 3m (retracted) / 4.5m (extended)
- Dip Angle Limit: Vertical to 45º Flatter angles to 30º from horizontal with special supports
- Power Requirements: 170 KVA, 1000 Volt, 3 phase, 50 cycle
- Water Consumption: 52 litres per second at 100 PSI (approx). Water is recycled through settling sumps