ROTARY DRILLING
Rotary drilling is mainly used to advance boreholes in rock, locate natural or artificial cavities in rock and rockhead beneath soils.

Several drilling options exist with either lorry or track mounted rigs including

• Continuous flight augering,
• Hollow stem augering,
• Barrel augering,
• Coring and rock rollering.

Down the hole hammers and temporary casing can be utilised with various drilling mediums such as
air, water, foam and mud.

Dependant on the size of the rig borehole depths can be >100m.
Generally, borehole depths of 30m to 50m are commonly employed in mining areas.

Samples of bedrock are recovered in seamless plastic tubes for subsequent logging by a suitably qualified engineer and for laboratory testing.

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