Underground Reverse Circulation (RC) Drilling Equipment

RC drilling for underground mining operations is quickly growing in popularity due to it being faster and cheaper than diamond drilling.

Underground RC Drilling

As Australia’s market leader in manufacturing premium quality reverse circulation (RC) drill rods and drilling consumables, we’re working closely with underground RC drillers and their clients to ensure smooth continuity at their mining operations.

Quickly growing in popularity, underground RC drilling provides a route to increasing sampling density and volume, resulting in a much faster and cheaper alternative to diamond drilling.

Harlsan can provide a suite of tough underground RC drilling supplies and consumables specifically designed for underground mining to keep you drilling for longer.

The Benefits of Utilising Underground RC Drilling


Traditionally, with diamond drilling, sample volumes are not large enough to provide a reliable grade estimate of the area surrounding the drill hole. If your underground operation permits it, RC drilling offers a number of significant benefits over diamond drilling:

The 5 Benefits of Underground RC Drilling

  1. Faster than diamond drilling
  2. Cheaper than diamond drilling
  3. Larger sample volume
  4. Less downstream core processing
  5. Increase sample density

Underground RC Drill Pipe

Designed and field tested for the toughest of reverse circulation drilling conditions. Get a boost in production and reduce downtime with Harlsan’s Underground RC Drill Pipe on your rig.

RC Drill Rod Product Brochure

Download the Harlsan Reverse Circulation Product brochure for a complete overview of the features and benefits that our equipment will bring to your drill rig.

Harlsan RC Drill Rod Brochure.pdf (541kb)


“Reverse circulation drilling has proved to be an effective means of providing large representative and high quality samples in open pit gold mines for over three decades. Applying this drilling methodology to underground grade control at Sunrise Dam has demonstrated that it can be as effective as surface RC for defining ore.”

Carswell & Clark 2013

RC Drill Rods & Inner Tubes Specifications

Tool Joint Spanner Flats

Rods available with or without spanner flats. Two or four flats as required.

RC Drill Rods Length & Size

Standard lengths from 1 to 6m in:

  1. 3″
  2. 3 ½”
  3. 4″
  4. 4 ½”
  5. 75mm & 78mm

RC Drill Pipe Thread Types

The most popular threads we support:

  1. Remet
  2. Metzke
  3. RRE
  4. Drillstar
  5. LW
  6. TS
  7. & other threads available

Robot Welding Technology

Independently tested & certified to exceed welding standard AS3992

O-rings or Urethane Seals

Harlsan RC Inner Tubes come with a choice of Urethane or O-rings sealing options.

Other Rods – DTH

We manufacture RAB, Cubex & API Rods to your requirements.

Australian Made Toughness

All Rods feature hardened European 4140 alloy steel tool joints.

The INLOK Drill Rod Range


Any driller who has used a sledgehammer to manually remove a collapsed Inner Tube from an RC drill rod or pipe will know how unsafe it can be. The whole procedure is inefficient and involves injury risk from the associated manual handling.

The Harlsan RC Drilling INLOK™ product range provides a safe and controlled solution to these problems.

RC Drill Pipe Ordering Information


From Africa through to Asia, Eastern Europe through to the UK, and Canada through to South America. We can supply you with robust and productive underground RC drilling gear.

For pricing, immediate supply or customised orders call us on +61 8 9021 1288.

Get your engineered drilling components and consumable items on time, on budget and on track with Harlsan’s manufacturing services. Call us now or request a quote.