Semi-mechanised drilling

SMI Drill Jig

1.5 m in 2 minutes

More face advance per blast, with the same crew

SMI Drill Jig
SMI Drill Jig
The problem, and what changes

A pneumatic drill jig suspended from a monorail on roof bolts or eyebolts, using inline thrust technology for faster drilling per hole and effortless extraction. Because it hangs from installed support, the jig cannot operate without support in place — there is no shortcut to take. Drilling is done remotely from 2 m off the face, and accurate drilling removes the human factor: hole direction and burden are set by the jig, not by how tired the operator is, so the hanging wall and footwall come out stable and to profile.

Underground application
  • At the face in conventional and mechanised stoping and development
  • From 0.75 m operating width
  • Bad hanging walls, dome slips, faults and dykes
  • Methane pockets, fissures and holing examination zones
  • Anywhere a trackless rig cannot reach or cannot be justified
Trialled and tested
Lanxess Chrome MinesMonorail Drill Jig across two shafts, 25 000 t per shaft. A two-year contract that established new standards and norms for the Drill Jig.
Glencore, RustenburgTwo 15 000-ton contracts executed with the Drill Jig.
Sibanye-Stillwater K615 000-ton contract managed by SMI.
Specifications
Assembled width
0.4 m
Assembled length
2.6 m development | 1.6 m stoping
Assembled height
0.6 m – 3.5 m
Mass
Boom 35 kg | Cradle 25 kg | Monorail 7 kg
Drilling times
1.5 m in 1 min 27 s | 2.6 m in 2 min 30 s
Hard rock extraction
20 seconds to collaring of the next hole
Air pressure
3 – 7 bar
Compatibility
Operates with all pneumatic machines

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