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In-The-Hole (ITH) hammer drilling is a process that incorporates a pneumatic hammer located directly above the drill bit in drilling operations.  The piston in the hammer impacts directly on the drill bit to provide the primary cutting force in the drilling process.  The power to drive the hammer piston is provided by compressed air, which can range from low pressure (80-100 PSIG) to medium pressure (200-350 PSIG) to high pressure (up to 1000 PSIG)


There are a number of different applications for ITH drilling in underground mining which can be broadly categorized as either production drilling (blast holes) or mine services (large diameter drilling for ventilation, drainage and paste backfill holes).

In the majority of underground mining situations electrical power is available making electric motor drives the preferred drive configuration.

NCA products used in underground mining applications: