What is diamond drilling? Diamond drilling is a go-to technique for mineral exploration. It’s a rotary drilling method that uses a diamond-impregnated drill bit to cut through hard rock and retrieve a solid core sample. These core samples provide geologists with the detailed subsurface data they need to map ore bodies, estimate resources, and make informed exploration decisions.
A quick look at the history Diamond drilling dates back to the early 1900s when French engineer Georges Delamare developed the first diamond bit. Since then, it’s become a cornerstone of mineral exploration - constantly evolving with improvements in bit technology, drilling rigs, and digital systems. Today, diamond drilling is more efficient and accurate than ever.
How diamond drilling works Here’s the basic idea: a diamond-tipped bit cuts through rock while capturing a cylindrical core sample inside a hollow drill tube. These continuous cores are then brought to the surface and logged by geologists to assess lithology, structure, mineralisation, and more.
Diamond drilling can reach impressive depths - up to 3,000 metres in some cases - and is known for producing precise, high-quality data.
The pros of diamond drilling Diamond drilling gives you the detail you need. It’s the best method for collecting high-quality core samples that are perfect for structural, lithological and mineralogical logging. It’s also capable of reaching deep targets, making it ideal for deeper exploration holes.
Because diamond drilling cuts through rock rather than breaking it up, it delivers more precise data to help define orebody geometry and support reliable resource estimates. Plus, it reduces contamination, so your samples stay clean and your models stay accurate.
The disadvantages of diamond drilling Diamond drilling isn’t always the fastest or cheapest option. It’s one of the most expensive methods due to the gear, labour and maintenance involved, and it tends to be slower than techniques like RC or air core. It also only gives you detailed data at specific intervals. So, while it’s great for precision, you might need to combine it with other methods to understand the bigger
Safety and environmental considerations Like all exploration activities, diamond drilling must meet strict safety and environmental standards. Managing drill cuttings, using appropriate fluids, and following site-specific protocols help reduce environmental impact. Worker safety is also critical, especially on remote or underground sites.
Comparison
Diamond Drilling
Alternative Method
When to Use
Diamond Drilling vs Air Core
Delivers intact, solid core samples.
Produces pulverised cuttings, suited for rapid, shallow geochemical surveys.
Use diamond drilling for detailed structural data or to support resource reporting (JORC/NI 43-101).
Diamond Drilling vs RC (Reverse Circulation)
Slower and more expensive, but provides unmatched geological insight.
Faster and cheaper; produces large-volume chip samples, ideal for initial resource delineation.
Use diamond drilling for detailed geological data; RC drilling is better for early-stage exploration.
Choosing the right method The best drilling method depends on your project goals, budget, and stage of exploration. Diamond drilling is often used later in the exploration process when detailed geological data is crucial for resource modelling and feasibility studies.
Australian diamond drilling contractors 🛠️ DDH1 Drilling Founded by directional drilling pioneers Murray Pollock and Matt Thurston, DDH1 is one of Australia’s top deep hole drilling contractors. They service explorers and major miners across surface and underground diamond coring, RC, and geotechnical drilling.
Visit DDH1 Drilling →
🌄 Spaulding Drillers Family-owned and operating since the '80s, Spaulding offers diamond, RC, and downhole hammer drilling across Tasmania. Known for reliability and local expertise.
Visit Spaulding Drillers →
🧭 Terra Drilling From the Goldfields to the wider Australian market, Terra Drilling specialises in surface diamond drilling and is known for quality-first operations.
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Find more diamond drillers At CorePlan, we work closely with drilling contractors across Australia. To help explorers find the right partner for their project, we created the Ultimate Drill Contractor Directory - a one-stop shop to compare rig counts, methods, locations and specialties.
Whether you need deep diamond drilling or hybrid programs with RC, our directory helps you find the right crew for the job.
👉 Explore the CorePlan Drill Contractor Directory
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