Air Core Drilling Equipment: Everything You Need to Start an Exploration Programme

So you've bought an Air Core drill rig.

Excellent.

Can you drill yet?

Probably not.

Because a drill rig without the correct compressor, rods, tooling, sampling equipment, consumables and spares is essentially a very expensive piece of machinery waiting for the rest of its friends to arrive.

This is one of the most common mistakes when exploration companies start buying drilling equipment.

Everyone focuses on the rig.

Nobody gets excited about hoses.

Until the hose stops the programme.

If you're planning to buy an Air Core drilling rig or build your own exploration drilling capability, here's what the complete system actually needs.

What Equipment Do You Need for Air Core Drilling?

A typical Air Core drilling package may include:

• Air Core drill rig;

• air compressor;

• Air Core drill rods;

• drill bits and cutting tools;

• subs and adaptors;

• air hoses and connections;

• sample-return system;

• cyclone;

• sample splitter where required;

• sample bags;

• rod handling equipment;

• lubricants;

• service components;

• spare parts;

• support vehicle;

• fuel system;

• safety equipment.

And that's before we start talking about the people operating it.

The exact package depends on:

Geology. Depth. Hole diameter. Terrain. Programme size. Sampling requirements. Location.

That's why CED prefers to start an Air Core equipment discussion with the drilling programme rather than the machine.

A CED Air Core drilling rig operating on a remote mineral exploration site with drill rods, sampling equipment and field support. A complete Air Core programme requires far more than the rig itself, including the correct compressor, drill string, tooling, consumables and spare parts.

1. The Air Core Drill Rig

Let's start with the obvious bit.

The rig.

An Air Core drilling rig needs to provide the rotation, feed, pullback and rod-handling capability required for the intended programme.

But the biggest rig isn't automatically the best rig.

Early-stage exploration frequently involves drilling large numbers of relatively shallow holes spread across a wide area.

That means mobility can matter just as much as raw drilling power.

If the rig drills a hole in three hours but requires another three hours to move 500 metres to the next target, your exploration programme isn't particularly fast.

So rig selection needs to consider:

• target depth;

• expected formation;

• hole diameter;

• drill string;

• pullback capacity;

• torque;

• mast configuration;

• rod handling;

• transport dimensions;

• terrain;

• mobilisation frequency.

  
  

Metres per shift aren't the only productivity measurement.

Sometimes holes per day matter more.

2. The Air Compressor

Now we arrive at the component people occasionally treat as an accessory.

It isn't.

Air Core drilling requires air.

Compressed air performs a critical role in transporting the sample back to surface.

The compressor therefore needs to be matched to the drilling system.

Too little air and you can create problems with:

• sample return;

• hole cleaning;

• penetration;

• drilling performance.

  
  

But simply buying the largest compressor available isn't necessarily intelligent either.

A larger compressor can mean:

• greater purchase cost;

• higher fuel consumption;

• increased transport weight;

• additional maintenance;

• larger logistical footprint.

  
  

The correct question isn't:

“What's your biggest compressor?”

It's:

“How much air does this drilling programme actually require?”

How Much CFM Does Air Core Drilling Need?

There is no universal number.

Required airflow depends on factors including:

• hole diameter;

• depth;

• rod diameter;

• formation;

• sample-return velocity;

• groundwater;

• elevation;

• drilling configuration.

  
  

This is the same principle we discussed in our article on RC drilling compressor requirements.

The compressor and drill rig need to be specified as one system.

If your supplier is quoting the rig without asking about the compressor, that's worth another conversation.

3. Air Core Drill Rods

Next:

The drill string.

Air Core rods aren't something you add to the order at the last minute.

You need enough rods to reach the intended depth—with appropriate contingency.

That sounds painfully obvious.

You would be surprised.

A programme targeting 100-metre holes doesn't want exactly 100 metres of rods.

Rods experience:

• thread wear;

• handling damage;

• bending;

• abrasion;

• loss;

• operational damage.

  
  

You need redundancy.

Because when one rod becomes unusable, geology doesn't politely move the target five metres closer to surface.

How Many Air Core Drill Rods Should You Buy?

Start with:

Maximum intended hole depth × number of operating rigs.

Then add contingency.

How much contingency?

That depends on:

• project duration;

• remoteness;

• expected wear;

• replacement lead time;

• logistics;

• number of rigs;

• drilling conditions.

  
  

For a project beside a major industrial centre, replacement tooling might arrive quickly.

For a programme in remote West Africa?

Or the jungle?

Or an island?

Or 400 kilometres from the nearest meaningful workshop?

Different conversation.

The more remote the programme, the more expensive “we'll order it when we need it” becomes.

A complete selection of Air Core drilling equipment including drill rods, cutting tools, bits, subs, hoses, sampling equipment and consumables. Correctly specifying the supporting equipment is critical when building a reliable Air Core exploration drilling package.

4. Air Core Drill Bits & Cutting Tools

Your cutting equipment is where the drilling system actually meets geology.

Which is reasonably important.

Air Core drilling is commonly used in softer and weathered formations, but those formations can vary enormously.

You may encounter:

• soil;

• clay;

• saprolite;

• weathered rock;

• gravel;

• sand;

• harder bands;

• competent basement.

  
  

Tool selection should reflect the expected formation.

And again:

One bit isn't a consumables package.

Wear happens.

Ground changes.

Equipment gets damaged.

A drilling programme should mobilise with enough tooling to continue operating when the first-choice tool inevitably stops being the first-choice tool.

5. Subs, Adaptors & Small Tooling

Welcome to the section procurement sometimes forgets.

Subs.

Adaptors.

Connections.

Pins.

Bushes.

Seals.

Small tools.

Not glamorous.

Very important.

A drilling programme worth hundreds of thousands—or millions—can be stopped by a component small enough to fit in somebody's hand.

This becomes especially painful during international exploration.

Because the part may cost $100.

The aircraft required to get it to site does not.

6. Air Hoses & Connections

Your compressor needs to deliver air to the drilling system.

Which means:

hoses matter.

The air-delivery system needs to suit:

• compressor output;

• operating pressure;

• connection type;

• rig layout;

• site configuration;

• required hose length.

  
  

Poorly specified or damaged hoses can reduce performance and create safety issues.

Carry spares.

This article could become extremely complicated here.

We'll resist.

For now.

7. Cyclone & Sample Collection System

Drilling the hole is only half the job.

You need the sample.

Air Core drilling is used because exploration teams want geological information.

The sample-return system therefore matters enormously.

Depending on the configuration, the system may include:

• cyclone;

• sample chute;

• splitter;

• collection bags;

• sample buckets;

• dust-control components.

  
  

The objective is to recover a representative sample from the intended interval while reducing contamination between samples.

A drilling system producing fantastic penetration rates and terrible samples is not performing well.

It's producing holes.

Exploration companies aren't paying for holes.

They're paying for information.

8. Sample Bags & Geological Consumables

Possibly the least exciting line item in the quotation.

Until you run out.

Sample bags need to be:

• appropriate for the sample;

• strong enough for site handling;

• clearly identifiable;

• available in sufficient quantities.

  
  

If you're drilling thousands of metres at one-metre intervals, do the maths.

5,000 metres = potentially thousands of individual samples.

Sampling consumables disappear quickly.

Order accordingly.

9. Rod Handling Equipment

Drill rods are repetitive, heavy and unforgiving.

A programme needs a practical system for:

• storing rods;

• transporting rods;

• presenting rods to the rig;

• handling used rods;

• maintaining clean threads.

  
  

Depending on the drilling package, this might involve:

• rod racks;

• rod carriers;

• vehicle-mounted systems;

• hydraulic handling equipment;

• manual systems.

  
  

Rod logistics might sound boring.

But reducing unnecessary manual handling can improve both safety and productivity.

10. Support Vehicle

Your drill rig has friends.

It needs:

• rods;

• fuel;

• tooling;

• compressor support;

• samples;

• spare parts;

• crew equipment.

  
  

Those things need to move.

This becomes especially important in Air Core programmes because the rig may relocate frequently.

A good support system keeps moving with the drill.

A bad one spends the day driving backwards looking for things.

11. Fuel

Drilling equipment enjoys diesel.

Quite a lot of it.

Your programme needs a fuel strategy covering:

• rig;

• compressor;

• support vehicles;

• generators where required.

  
  

And the further you operate from established infrastructure, the more important fuel logistics become.

The question isn't simply:

How much fuel does the machine use per hour?

It's:

How do we reliably keep several pieces of equipment fuelled every day for the duration of the programme?

That's logistics.

And logistics can destroy otherwise excellent drilling plans.

12. Spare Parts

Here's our favourite subject.

Because everybody likes spares right up until they see the price.

Then suddenly:

“Do we really need all of those?”

Maybe not.

But ask yourself another question.

What does one day of drilling downtime cost?

Rig.

Crew.

Camp.

Vehicles.

Supervision.

Exploration staff.

Flights.

Accommodation.

Schedule delays.

Now compare that number with the price of the spare component.

Remote drilling changes the economics completely.

CED normally recommends building a project-specific spares package around:

• operating hours;

• expected wear;

• project duration;

• environment;

• replacement lead time;

• critical failure points.

  
  

Not every spare has equal importance.

Focus on the parts capable of stopping the operation.

13. Service Parts

Drill rigs and compressors require scheduled maintenance.

That means your mobilisation should include appropriate:

• filters;

• oils;

• seals;

• belts;

• lubricants;

• service kits;

• wear components.

  
  

The programme should know when services are due before the equipment leaves the yard.

Not discover it halfway through the bush.

14. Tools & Workshop Equipment

Somebody eventually has to repair something.

Your site therefore needs an appropriate tool package.

That may include:

• hand tools;

• hydraulic tools;

• lifting equipment;

• grease equipment;

• welding capability;

• electrical testing equipment;

• pressure testing equipment;

• thread maintenance equipment.

  
  

The exact workshop requirement depends on the project.

But a drill rig without tools is essentially hoping nothing ever breaks.

That's optimistic.

15. The People

We've finally reached the most important component.

You can buy:

The rig.

The compressor.

The rods.

The tooling.

The spares.

The vehicles.

And still run a terrible drilling programme.

Because equipment doesn't operate itself.

Experienced drillers understand:

• changing ground conditions;

• drilling parameters;

• sample return;

• equipment behaviour;

• preventative maintenance;

• early warning signs;

• when to push;

• when to stop.

  
  

Good operators protect equipment.

Great operators protect the programme.

Air Core Equipment Checklist

Before mobilising, your checklist should look something like this:

Drilling

• Air Core rig

• drill rods

• bits/cutting tools

• subs

• adaptors

• rod handling

  
  

Air

• compressor

• hoses

• connections

• spare hoses

• service parts

  
  

Sampling

• cyclone

• splitter if required

• sample chute

• sample bags

• buckets

• sample storage

  
  

Support

• support vehicle

• rod carrier

• fuel system

• tools

• workshop equipment

  
  

Consumables

• bits

• wear parts

• lubricants

• oils

• filters

• seals

  
  

Spares

• critical rig spares

• compressor spares

• drilling-tool spares

• hydraulic components

• electrical components

  
  

Personnel

• driller

• offsiders

• mechanic/fitter

• supervisor where required

  
  

That's considerably more interesting than:

1 × Drill Rig.

Buying an Air Core Drill Rig for Africa

Let's make this geographically relevant.

Air Core drilling can be particularly useful across exploration regions with extensive weathered profiles and saprolite.

That includes major mineral exploration areas across:

• Ghana;

• Côte d'Ivoire;

• Guinea;

• Mali;

• Burkina Faso;

• Zambia;

• Tanzania;

• Namibia;

• Botswana;

• other parts of Africa.

  
  

But equipment destined for remote African exploration should be specified around the actual operating environment.

Consider:

• road conditions;

• fuel quality and availability;

• spare-parts logistics;

• customs;

• local maintenance capability;

• heat;

• dust;

• rainy seasons;

• distance from workshops.

  
  

A machine specification written for a factory floor is not an exploration plan.

Buying an Air Core Rig vs Contracting the Drilling

This deserves consideration before purchasing anything.

Owning the equipment can make sense when:

• you have substantial ongoing drilling;

• you want control over scheduling;

• drilling is strategically important;

• you have operational capability;

• you can maintain and staff the equipment.

  
  

Contract drilling can make sense when:

• the programme is short;

• you don't want operational responsibility;

• skilled personnel aren't available internally;

• mobilisation is complicated;

• you want one party responsible for delivering metres and samples.

  
  

And then there is a third option.

Buy the equipment and bring experienced people in to commission, train and operate it initially.

That can be an extremely useful middle ground.

The CED SFM7300 mobile exploration drilling system, designed for Air Core, Reverse Circulation and auger drilling in remote exploration environments. The SFM concept combines drilling capability with a highly mobile 6×6 platform to improve movement between exploration targets.

Enter the CED SFM7300

CED developed the SFM7300 around this exact problem.

Early-stage exploration needs mobility.

The SFM7300 concept combines Air Core, RC and auger drilling capability with the wider CED SFM mobile exploration platform.

The system is designed around a 6×6 vehicle platform for remote exploration environments.

Depending on configuration, the drilling unit can operate from the vehicle or independently off the vehicle.

That creates flexibility.

Because exploration access is rarely as straightforward as the satellite image suggested.

A Turnkey Air Core Drilling Package

This is where CED's approach becomes simple.

Instead of selling:

a rig

we can build:

an Air Core drilling package.

That can include:

• CED Air Core drill rig;

• SFM7300 mobile drilling platform;

• CED air compressor;

• Air Core drill rods;

• tooling;

• bits;

• subs;

• adaptors;

• hoses;

• sampling equipment;

• consumables;

• spare parts;

• support equipment;

• commissioning;

• training;

• experienced drilling personnel.

  
  

One supplier.

One system.

One conversation about whether everything actually works together.

Remarkably useful.

How Much Does an Air Core Drilling Rig Cost?

We knew we'd get here eventually.

And the answer is:

It depends what you're actually buying.

A bare drill rig and a turnkey Air Core drilling package are completely different purchases.

The final cost can depend on:

• rig size;

• depth capability;

• mobility platform;

• compressor;

• drill-string length;

• tooling quantity;

• consumables;

• spares;

• sampling equipment;

• support equipment;

• freight;

• commissioning;

• training.

  
  

So when comparing quotations, don't compare the bottom-line number first.

Compare the scope.

One quotation might contain a drill rig.

Another might contain everything required to actually drill.

Those aren't competing prices.

They're competing definitions of “ready to work.”

What Should You Tell an Air Core Rig Supplier?

Before requesting a quotation, provide:

1. Country and project location

2. Expected geology

3. Maximum hole depth

4. Typical hole depth

5. Hole diameter

6. Total programme metres

7. Number of holes

8. Expected groundwater

9. Terrain and access

10. Required mobilisation date

With that information, an equipment supplier can start designing something useful.

Without it?

Everyone is guessing.

The CED Rule: Buy the Drilling System

This principle extends far beyond Air Core.

A drilling programme is a collection of interconnected systems.

The rig needs the compressor.

The compressor needs the hoses.

The rig needs rods.

The rods need tooling.

The samples need collecting.

The equipment needs servicing.

The crew needs spares.

And everything needs moving.

Miss one critical component and your million-dollar exploration programme can stop because somebody forgot a fitting.

So if you're buying Air Core drilling equipment, don't ask:

“How much is the rig?”

Start with:

“What do we need to drill?”

Then build backwards.

That's how CED approaches it.

Rig. Air. Rods. Tooling. Samples. Spares. Support. People.

Now you have a drilling system.

Over to the exploration teams

If you were mobilising an Air Core rig somewhere genuinely remote tomorrow, what's the ONE spare part or consumable you absolutely wouldn't leave without?

Drillers, fitters and exploration managers—we want the answers that come from learning this the expensive way.

Planning to buy an Air Core drilling rig or complete exploration drilling package?

Cylinder Exploration Drilling can supply the rig, compressor, rods, tooling, consumables, spares and support equipment as one turnkey system—with commissioning, training and drilling personnel available where required.

Don't send us a shopping list.

Send us the drilling programme.