Geo Sonic Drilling

We're all about good vibrations with the sample in the bag

The EP rigs use a conventional type coring method to retrieve the sample while running an outer casing to keep the hole open the casing can be advanced with or in front of the sampler dependent on the ground conditions the sample is captured in a plastic bag as it enters the sampler. The internal diameter of the casing is 95mm, which is ideal for monitoring bore installation. All the EP rigs can use the Macro Core style sampling method producing a 40mm core if required. This is larger than the macro core  sample of 32mm. The EP26 rig is capable of sampling through  consolidated  ground conditions as well as broken material like land fill.

The EP26 rigs


Lower peak noise levels than typical top hole hammers.

Low speed rotation combined with high frequency vibration lets the operator determine the optimum drilling method.

Quieter than a rotary percussion drilling rig.

Faster sampling rates than a rotary rig.

Has the ability to retrieve highly representative, relatively undisturbed continuous core samples from both solid and unconsolidated materials.

No need for drilling fluid, allowing for uncontaminated core samples.

Dual tube method allows for simultaneous sampling and monitoring well completion.


Uses biodegradable hydraulic oil.


Drilling Depth: 30+ metres, depending on ground formation.

Drill Head: Hydraulically driven rotary head with vibration.

Drill Head Rotation Speed: 30 rpm low and 60 rpm high.

Drill Head Rotation Torque: 3.4 kNm ( 346.8 kg-m) low and 1.7 kNm ( 173.4 kg-m) high.

Feed System: Hydraulic cylinder, feed stroke of 1.4 meters. Feed Speed of 0 - 11.1 meters per minute.

Maximum Feed Force 20.6 kNm (2100 kgf) and Maximum Balance Force is 97.8 kNm. (9975 kgf) Stroke 1.4 metre.

Vibratory Mechanism: Maximum frequency of 400 cpm, Maximum Vibratory Force 38 kN (3900 kgf).

Mast: Hydraulically raised and lowered, slide stroke of 500mm. The head sheave has a manual extension with a stroke of 730mm.

Hoist: Hydraulically driven, maximum line pull capacity of 3.9 kN (400 kgf). The line pull speed is 0 - 50 meters per minute.

Wire rope: 5mm x 23 metres.

Track: Engine horsepower of 27 HP at 2,200 rpm.

Total weight of drill unit: approximately 2,650 kg.


The mast can tilt up to 90 degrees.

Overall height of 2.33 meters when the mast is tilted 90 degrees.

Waterproof control console.

Levers for levelling the drill and positioning the mast.

EP26 Rig being loaded on its carrier.

To contact us:

Phone: 0429914320

Fax: +61893849248


Limestone core after being removed from the sample barrel.