Specialist Drilling
Disciplines
From shallow auger investigations to deep diamond core drilling, Odex drilling nationally, and emergency sinkhole response — Geo Drill SA has the qualified professionals, fleet, and CIDB registration to handle any ground condition across South Africa.
NEW: Odex Drilling now available nationally across all 9 South African provinces
Odex Drilling
Geo Drill SA offers Odex drilling — an overburden drilling system that simultaneously advances a casing through unconsolidated or unstable ground while drilling. Odex is the preferred method for drilling through collapsing formations, loose sands, gravels, and boulder-rich soils where conventional drilling methods fail to maintain borehole integrity. Available nationally across all nine South African provinces, Odex drilling is widely used for water well installation, geotechnical investigation boreholes, environmental monitoring wells, and foundation investigations in difficult ground conditions. Our qualified professionals operate Odex systems in a range of diameters to suit project requirements — from small-diameter monitoring boreholes to large-diameter production wells. Geo Drill SA is one of the few contractors offering Odex drilling as a nationally available service across South Africa.
Key Applications
- Water well installation in unstable ground
- Geotechnical boreholes in collapsing formations
- Environmental monitoring wells
- Boulder and gravel formation drilling
- Foundation investigation in difficult ground
Auger Drilling
Auger drilling is the most widely used method for shallow soil investigation, environmental sampling, and borehole installation in South Africa. Geo Drill SA operates both continuous flight auger (CFA) and solid stem auger systems capable of penetrating depths of up to 30 metres in soft to medium ground conditions. Our auger rigs are mobilised across Gauteng, Limpopo, Mpumalanga, KwaZulu-Natal, and the Western Cape for geotechnical site investigations, soil classification, and shallow groundwater monitoring borehole installation. We provide soil samples at regular intervals for laboratory testing and in-situ SPT testing where required. Auger drilling is cost-effective, fast, and ideal for pre-construction site investigations on residential, commercial, and infrastructure developments across all nine South African provinces.
Key Applications
- Pre-construction site investigation
- Soil classification & sampling
- Shallow groundwater monitoring
- Environmental contamination investigation
- Foundation design assessment
Rotary Air Blast Drilling
Rotary Air Blast (RAB) drilling is a high-productivity exploration technique widely used across South Africa's mineral-rich provinces of Limpopo, North West, Northern Cape, and Mpumalanga. Geo Drill SA's RAB rigs use compressed air to lift cuttings to surface, providing rapid geological profiling at depths of 60–100 metres in hard rock terrains. RAB drilling is the preferred method for first-pass exploration programs, geochemical sampling, and structural mapping on gold, platinum, chrome, and base metal projects. Our experienced drill operators and geologists ensure representative sampling at every metre interval, with cuttings collected in calico bags for assay.
Key Applications
- First-pass mineral exploration
- Geochemical sampling
- Geological profiling
- Gold & platinum exploration
- Structural mapping
Diamond Core Drilling
Diamond core drilling is the gold standard for geotechnical and geological investigation, providing intact rock core for detailed structural analysis, rock quality designation (RQD), and laboratory testing. Geo Drill SA operates NQ, HQ, and PQ core barrel systems capable of drilling to depths exceeding 500 metres in all rock types. Our diamond drilling services support detailed geotechnical site investigations for dams, tunnels, bridges, and high-rise foundations; mineral resource definition drilling for gold, platinum, coal, and iron ore; and environmental investigations requiring intact sample recovery. Core recovery rates consistently exceed 95% thanks to our qualified professionals, well-maintained equipment, and use of premium diamond bits.
Key Applications
- Resource definition drilling
- Geotechnical site investigation
- Dam & tunnel investigations
- Rock quality designation (RQD)
- Laboratory core testing
Sonic Drilling
Sonic drilling uses high-frequency resonance energy to advance a core barrel through unconsolidated materials with near-continuous core recovery and minimal ground disturbance. Geo Drill SA's sonic rig is particularly suited to environmental site assessments, contaminated land investigations, and geotechnical investigations in heterogeneous fills, alluvial deposits, and coastal sediments. The key advantages of sonic drilling include excellent sample quality with minimal cross-contamination, the ability to drill through cobbles and boulders that defeat conventional auger and mud rotary methods, and significantly reduced drill cuttings waste — critical for sensitive environmental sites.
Key Applications
- Environmental contamination investigation
- Brownfield site assessment
- Alluvial & coastal sediment drilling
- Heterogeneous fill investigation
- Continuous core sampling
Reverse Circulation Drilling
Reverse Circulation (RC) drilling is the preferred method for mineral resource definition and grade control in South African mining operations. Geo Drill SA's RC rigs use dual-wall drill rods to deliver compressed air down the annulus and return cuttings up the inner tube to a cyclone sampler at surface — providing uncontaminated, representative chip samples at every metre interval. RC drilling achieves depths of 200–400 metres in hard rock and is used extensively in the Bushveld Complex for platinum and chrome resource definition, in the Witwatersrand Basin for gold grade control, and in the Limpopo and Northern Cape for iron ore and manganese resource estimation.
Key Applications
- Mineral resource definition
- Open-pit grade control
- Platinum & gold drilling
- Chrome & manganese programs
- JORC/SAMREC compliant sampling
Dolomite Drilling
Dolomite investigation drilling is a specialist service required for any development on dolomitic land in South Africa — predominantly in Gauteng, North West, and Limpopo. Geo Drill SA is a registered specialist contractor for dolomite site investigations compliant with SANS 1936 and the NHBRC's dolomite risk management guidelines. Our dolomite investigation programs include percussion and rotary drilling to assess the depth to bedrock, presence of pinnacles and cavities, dissolution features, and overburden characteristics necessary for dolomite risk zoning (Inherent Hazard Classes D1–D7). Reports are prepared by registered professional geotechnical engineers.
Key Applications
- NHBRC dolomite risk zoning
- Residential township investigation
- Industrial development clearance
- SANS 1936 compliance reports
- Cavity & pinnacle assessment
Sinkhole Drilling
Sinkhole formation is a critical geotechnical risk in South Africa's dolomitic regions, with Gauteng experiencing the highest frequency of sinkhole incidents nationally. Geo Drill SA provides rapid emergency response sinkhole investigation drilling to assess cavity extent, determine remediation requirements, and provide risk zoning for affected properties. Our emergency response team can mobilise a rig to any Gauteng site within 24 hours and to other provinces within 48 hours. Call our 24/7 emergency line: 079 555 7453.
Key Applications
- Emergency sinkhole response
- Cavity extent mapping
- Remediation assessment
- Risk zone reclassification
- SANS 1936 sinkhole reports
Grouting Drilling
Grouting drilling is used to inject cementitious or chemical grout into the ground to fill voids, stabilise weak formations, reduce groundwater ingress, or improve bearing capacity beneath existing structures. Geo Drill SA provides compaction grouting, permeation grouting, and cavity filling services across South Africa, with particular expertise in dolomite void filling and sinkhole remediation grouting in Gauteng, North West, and Limpopo.
Key Applications
- Dolomite void filling
- Sinkhole remediation grouting
- Foundation stabilisation
- Groundwater cutoff barriers
- Compaction grouting
Horizontal Drilling
Geo Drill SA offers Horizontal Directional Drilling (HDD) services for the trenchless installation of pipelines, conduits, and cables beneath roads, railways, rivers, and environmentally sensitive areas across South Africa. HDD eliminates the need for open-cut excavation in congested urban areas, reducing disruption to traffic, utilities, and the public. Our HDD rigs are equipped with electromagnetic tracking systems to ensure accurate bore path control.
Key Applications
- Pipeline crossings under roads
- River and railway crossings
- Utility cable installations
- Urban trenchless solutions
- Fibre optic conduit boring
In-Situ Testing
In-situ geotechnical testing provides direct measurement of soil and rock properties in their undisturbed, natural state. Geo Drill SA offers a comprehensive suite of in-situ testing services including Standard Penetration Testing (SPT), Cone Penetration Testing (CPT), Piezocone Testing (CPTu), Pressuremeter Testing (PMT), Field Vane Shear Testing (FVT), Borehole Permeability Testing, and Dynamic Probing (DP) for rapid shallow investigation.
Key Applications
- SPT & CPT testing
- Pressuremeter testing
- Vane shear testing
- Borehole permeability tests
- Foundation design parameters
Pole Drilling
Geo Drill SA provides specialist pole drilling services for the installation of power line poles, telecommunications masts, street lighting foundations, and traffic signal structures across South Africa. Our pole drilling rigs are available in various sizes to accommodate standard Eskom distribution poles, high-voltage transmission line foundations, and telecom tower footings in all ground conditions.
Key Applications
- Power line pole installation
- Telecommunications mast foundations
- Street lighting installation
- Traffic signal structures
- Rural electrification projects
Rotary Mud Drilling
Rotary mud drilling uses a circulating drilling fluid (mud) to stabilise borehole walls, cool the drill bit, and return cuttings to surface. Geo Drill SA deploys rotary mud rigs for deep water well construction, geotechnical investigations in unstable or collapsing formations, and environmental boreholes requiring casing installation. This technique is essential in areas with sandy, gravelly, or fractured rock formations.
Key Applications
- Deep water well construction
- Unstable formation investigation
- Environmental boreholes
- Coastal sediment investigation
- Casing installation
Need a Specific Drilling Service?
Our qualified professionals will assess your project requirements and recommend the most appropriate drilling method and equipment for your site conditions.