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Hollow Stem Auger | Mud Rotary | Core

Our auger rigs are designed to efficiently switch from auger to mud rotary to rock coring in minutes.


How It Works

​Hollow stem augers are a versatile and effective method for advancing the borehole under certain conditions. They work much like a temporary casing in that the centers of the augers are open to allow for soil, water sampling, and/or well installation. As the augers are advanced into the subsurface, the auger spirals convey the unconsolidated formations to the surface, typically with no drilling fluids. Auger drill rigs are the preferred drilling method for a variety of applications including geotechnical, environmental, and construction drilling. Hollow stem augers are commonly used for soil sampling and ground water monitoring well installations.


Mud rotary drilling is an open hole, fluid based recirculatory method of drilling. The drilling fluid lubricates the drill bit, carries drill cuttings to the surface, and provides hydrostatic pressure in the borehole to keep the hole open and stable for sampling and installations. Mud rotary drilling is used in geological areas that prohibit the use of hollow stem augers, including: bedrock, broken rock, and dense sand or gravel formations.


  • Auger / mud rotary / diamond core drilling

  • Hollow stem auger drilling up to 12.25 in. ID x 16 in. OD

  • Mud rotary drilling 6 in. diameter up to 400 ft.

  • NQ, HQ3, PQ3 wireline diamond coring

  • 140 lbs. and 300 lbs. calibrated SPT automatic hammers

  • Overwater drilling and sampling

  • Platform drilling over the edge of an embankment, such as a pier on the waterfront

  • Wireline rock coring

  • 500 gallon water tank

  • Self-contained decontamination trailer

  • Rubber track skid steer support vehicle accompanies limited access rig


  • Monitoring well installation and development

  • Product recovery wells

  • Methane recovery wells

  • Continuous multi-tube (CMT) well installations

  • Injection wells (vapor, water, thermal)

Hollow Stem Auger | Mud Rotary | Core Rigs

  • Mobile Drill B-57 track mounted

  • Mobile Drill B-58 truck mounted

  • Mobile Drill B-59 truck mounted

  • Mobile Drill B-60 truck mounted

  • LDS-75 track mounted

  • CME-75 truck mounted

  • CME-85 HT truck mounted

  • CME-850X track mounted

Our Projects

See Our Rigs In Action.

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