Aircore drilling has become a preferred method for early stage mineral exploration across Western Australia. Understanding how it works, where it fits in a drilling program, and its limitations helps geologists and project managers make better decisions in the field.
What Is Aircore Drilling And When Is It Used?
Aircore drilling is a rotary drilling technique that uses compressed air to lift cuttings through an inner tube, delivering relatively uncontaminated samples to the surface. The drill bit is usually a three bladed, tungsten tipped design that can penetrate unconsolidated cover, sands and clays, as well as light to moderately hard formations. Because the sample travels inside a separate tube, it is less likely to be contaminated by the surrounding geology compared with single tube methods such as traditional RAB drilling. This cleaner sample path is one of the main reasons aircore drilling is widely used for geochemical and stratigraphic sampling.
In a typical exploration program, aircore drilling is used to test anomalies identified by geophysics or surface sampling, or to map the depth and nature of transported cover. It is particularly valuable in greenfields areas where little is known about the subsurface and cost control is critical. Hole diameters are usually modest, often around 85 to 87 millimetres, which allows for rapid penetration and efficient coverage of large areas. For many projects, aircore drilling provides the first reliable subsurface data that guides later reverse circulation or diamond drilling.
Because aircore rigs are generally lighter and more compact than heavier RC or diamond rigs, they can access areas that might otherwise be difficult or uneconomic to test. This includes sandy terrains, paleo channels and remote sites with limited existing infrastructure. For explorers working across Western Australia’s varied landscapes, this combination of mobility, speed and sample quality makes aircore an important first pass tool.
Key Advantages For Exploration Planning And Budget Control
One of the strongest advantages of aircore drilling is cost effectiveness relative to deeper, heavier drilling methods. Penetration rates are typically high, which means more metres drilled per shift and more data points for the same budget. For early stage projects where targets are still being refined, this allows exploration teams to test multiple concepts before committing to more expensive RC or core drilling. The ability to cover more ground at lower cost can significantly shorten the time from concept to discovery.
Sample quality is another critical factor for exploration decision making. Because aircore uses an inner tube to transport cuttings, the risk of contamination from the sidewalls of the hole is reduced compared with single tube systems. This is especially important when chasing subtle geochemical anomalies or narrow mineralised zones that could be masked by mixed samples. When combined with disciplined sampling procedures and experienced drill crews, aircore can deliver reliable data suitable for both geochemical screening and basic geological logging.
From a logistical perspective, modern aircore rigs are designed to be highly manoeuvrable and relatively light on infrastructure requirements. Many units are mounted on 4×4 prime movers and supported by all wheel drive trucks and self contained camps, which allows drilling contractors to operate efficiently in remote regions. For project managers, this means fewer delays related to access preparation and a reduced need for heavy earthworks. In practice, this can translate into shorter mobilisation times, more flexible scheduling and less disruption to other site activities.
Environmental And Safety Considerations In Aircore Programs
Environmental performance has become a central consideration for exploration drilling, and aircore is well suited to low impact operations when managed correctly. Lightweight rigs and smaller pads reduce the amount of clearing required, which is particularly important in sensitive ecosystems or on agricultural land. Some contractors, such as Bostech Drilling Australia, operate dedicated zero impact systems that contain drill cuttings, outside returns, groundwater and drill waste within compact trailers. This approach helps prevent contamination of the drill site and supports rapid rehabilitation once drilling is complete.
Safety is equally important, given the combination of high pressure air, rotating equipment and remote locations. Reputable drilling contractors operate under certified safety management systems and invest in training, maintenance and supervision to manage these risks. For exploration companies, partnering with a contractor that treats safety and environmental performance as core priorities can reduce project risk and support compliance with regulatory and community expectations. When aircore drilling is planned with these factors in mind, it can deliver high quality data while maintaining a strong social and environmental licence to operate.
Bringing It All Together For Better Exploration Decisions
Used thoughtfully, aircore drilling provides a powerful balance of cost efficiency, sample quality and low environmental impact for mineral exploration across Western Australia and beyond. It is most effective when integrated into a broader exploration strategy that recognises its strengths in shallow to moderate depths, rapid coverage and geochemical screening. Choosing an experienced contractor that understands aircore, zero impact practices and remote operations can make a significant difference to data quality and overall project outcomes.
Bostech Drilling Australia has been supporting exploration programs since 1993 with specialised aircore, RAB, slimline reverse circulation and zero impact drilling services, and can assist with planning and executing tailored drilling campaigns.
For more information, please email or call our friendly team on 08 9250 4252 today.