Underground Drilling

Diamond drilling is also important to an established mine. It is used to:

- explore for new ore or outline and map known orebodies;
- investigate rock types and their structure;
- locate orebodies displaced by faults and fields;
- put out pilot holes to direct drifts and stopes to the proper location;
- establish drain holes, grouting and ventilation holes; and
- drill undisturbed holes to allow placement of rock mechanics instrumentation for measuring stresses in the rock.

Underground diamond drills are smaller and lighter than surface drills, and normally run on electricity, not diesel fuel.

Typical modem underground drills have features which make the extraction of rods from the hole very fast.

While most underground drills are now hydraulic types powered by electric motors, some sizes are also available with air and diesel power for when electricity is not available. Diesel-powered drills, however, need extra ventilation and diesel exhaust scrubbers.

Having a drill underground permits the drilling of holes at any angle, which is very advantageous to the mine geologist.

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