How Much Does Diamond Drilling Cost Per Metre? The Answer Nobody Likes: It Depends

“How much does diamond drilling cost per metre?”

It sounds like a simple question.

It isn't.

You can have two diamond drilling programmes targeting similar depths with the same core size and somehow end up with completely different costs.

One rig is happily chewing through competent rock.

The other is losing water, reaming broken ground, burning through bits, waiting on a helicopter and wondering which deity controls core recovery.

Same metre.

Very different price.

So if you're budgeting a mineral exploration programme and trying to understand diamond drilling cost per metre, forget looking for one magic number.

The useful question is:

What is actually going to determine the cost of drilling your metres?

Let's get into it.

What Does Diamond Drilling Cost Per Metre?

There is no universal diamond drilling rate.

Publicly reported exploration budgets demonstrate just how wide the numbers can become.

For example, Thunder Gold reported all-in drilling costs of approximately C$275–C$325 per metre, averaging around C$300/m, for drilling undertaken at its Tower Mountain project during 2024–2025.

Elsewhere, a technical report for Lahontan Gold's Santa Fe Project estimated US$320/m all-in for diamond drilling, compared with US$140/m for RC drilling. Importantly, that all-in estimate incorporated technical, analytical, permitting, reclamation and logistics costs rather than simply the contractor's drilling rate.

Those examples aren't a price list.

They're proof of the point.

The number written next to “drilling” on a quotation is not necessarily the number each completed metre ultimately costs the exploration company.

And that's where drilling budgets occasionally get interesting.

A remote diamond drilling operation in challenging mountainous terrain, showing a CED exploration drill rig, drilling crew, drill rods and core trays on an active drill site. The image highlights the equipment, personnel and logistics that contribute to the real cost of diamond drilling per metre.

1. Ground Conditions Can Murder a Beautiful Spreadsheet

The geological model might look fantastic.

The drilling budget might look even better.

Then the rig starts turning.

Broken, fractured, highly weathered, swelling or unstable formations can completely change drilling performance.

Instead of simply drilling forward, crews may need to:

• ream sections repeatedly;

• advance casing;

• change drilling-fluid programmes;

• cement unstable zones;

• reduce individual drilling runs;

• change bits more frequently;

• pull and rerun rods;

• recover stuck tooling; or

• spend considerably more time maintaining the hole.

A metre drilled through straightforward competent rock and a metre successfully advanced through collapsing ground are both recorded as one metre.

Operationally, they aren't remotely the same thing.

This is why the cheapest quoted metre can become extremely expensive when ground conditions deteriorate.

2. Hole Depth Changes Everything

A 100 m diamond hole and a 1,000 m diamond hole aren't simply the same job multiplied by ten.

As depth increases, so can:

• rod handling time;

• trip time;

• bit-change time;

• water requirements;

• torque requirements;

• equipment demands;

• deviation risk;

• wear;

• recovery time when something goes wrong.

Imagine changing a bit.

At shallow depth, it can be relatively routine.

At significant depth, you've got an entire drill string between the rig and that bit.

Every trip costs time.

And time costs money.

3. HQ, NQ or PQ? Core Diameter Matters

Core size also influences diamond drilling costs.

Common exploration sizes include PQ, HQ and NQ, with larger diameters producing larger core but requiring correspondingly larger tooling and holes.

There are perfectly good reasons to drill larger diameter core.

Perhaps you need better sample volume.

Perhaps the geology requires it.

Perhaps metallurgical work is planned.

Perhaps larger diameter drilling helps you manage difficult upper formations before reducing diameter deeper in the hole.

But don't choose your core size because somebody once told you:

“HQ is better.”

Better for what?

The correct drilling programme is the one designed around the geological objective and the ground—not somebody's favourite core barrel.

4. Mobilisation: The Metre You Never Drill

Here is one of exploration drilling's less glamorous realities:

Before you drill metre number one, you may already have spent a considerable amount of money.

A drill programme can require:

• rig transport;

• trucks;

• shipping;

• customs clearance;

• cranes;

• helicopters;

• access roads;

• drill pads;

• camps;

• water systems;

• fuel storage;

• support vehicles;

• environmental preparation;

• crew mobilisation.

Move into genuinely remote exploration and logistics can become a project of its own.

Your drilling contractor might quote an attractive metre rate.

Lovely.

Now get the rig onto a mountain, through a jungle, across an international border or onto an island.

This is precisely why heli-portable and man-portable diamond drilling rigs exist.

Sometimes the smartest drilling solution isn't the rig that drills fastest.

It's the rig you can actually get to the target.

Diamond drill core laid out beside drill rods and drilling equipment on an active exploration site. Drill rods, core recovery, bits, barrels and other consumables all contribute to diamond drilling costs and overall drilling performance.

5. Water Can Become a Major Drilling Cost

Diamond drilling needs water.

Lots of exploration targets aren't conveniently located beside an unlimited clean water supply.

Suddenly you're dealing with pumps, hoses, tanks, transport, water recirculation and potentially very long supply lines.

Then there is water loss downhole.

A formation that happily swallows everything you're pumping into it can turn water management into a serious operational problem.

This is where a properly designed diamond drilling mud programme becomes more than another consumables line on the purchase order.

The correct drilling-fluid system can help with:

• hole stability;

• cuttings transport;

• lubrication;

• fluid loss;

• cooling;

• reducing torque;

• protecting tooling.

Trying to save a tiny amount on drilling mud while losing hours—or days—fighting the hole is an interesting form of economics.

6. Bits Are Cheap Until You're Using Lots of Them

Choosing diamond bits purely by purchase price can be another false economy.

Formation matters.

Rock hardness matters.

Abrasiveness matters.

Fracturing matters.

Matrix selection matters.

A more expensive bit that achieves significantly better penetration and life may produce cheaper metres than the bargain bit sitting at the top of your procurement spreadsheet.

Cost per bit isn't the important number.

Cost per metre achieved with that bit is.

That distinction applies to quite a lot of drilling equipment.

7. Core Recovery Has a Value Too

Here's another trap.

You can obsess over drilling cost per metre while forgetting why you're drilling in the first place.

You're paying for geological information.

If one drilling approach gives you cheaper metres but poorer sample recovery, contaminated samples or insufficient structural information, have you actually saved anything ?

Diamond drilling remains particularly valuable because continuous core can provide geological, structural, geotechnical and metallurgical information that chip-based methods cannot always reproduce.

The cheapest hole isn't necessarily the hole that creates the most value.

8. The Drill Rig Matters—But So Does Everything Around It

People love talking about rigs.

CED manufactures them, so we're hardly going to complain.

But a drilling operation is a system.

The rig needs the correct:

• water pump;

• rods;

• core barrels;

• bits;

• reamers;

• casing;

• drilling fluids;

• tooling;

• spares;

• support equipment;

• mechanics;

• drillers.

Buying a powerful rig and then under-specifying everything supporting it is a fantastic way to own a very expensive stationary object.

A drilling system should be designed around the programme.

Not around whichever machine happened to be available.

Helicopter sling-load operations supporting a remote mineral exploration drilling programme in mountainous terrain. Heli-supported drilling allows rigs, consumables, fuel and equipment to reach exploration targets where conventional road access is impossible.

9. The Cheapest Drilling Quote Isn't Always the Cheapest Programme

This deserves its own heading.

Procurement teams understandably compare metre rates.

They should.

But metre rate alone doesn't tell you:

• expected productivity;

• standby arrangements;

• mobilisation costs;

• consumables charges;

• bit charges;

• casing costs;

• fuel responsibilities;

• water responsibilities;

• shift structure;

• mechanical support;

• spare-parts availability;

• recovery expectations;

• demobilisation costs.

Imagine Contractor A quotes 15% less per metre but averages materially fewer productive metres per shift and suffers significantly more downtime.

Contractor B suddenly doesn't look expensive.

The better comparison is:

What will it cost us to obtain the geological information we actually need?

That's a much more useful question.

Owning a Diamond Drill Rig vs Hiring a Contractor

Now things get commercially interesting.

Companies planning substantial or continuous exploration programmes may consider buying their own diamond drilling rig rather than contracting every metre.

That can make sense.

It can also go spectacularly wrong.

Owning the rig potentially gives an exploration company greater control over scheduling and equipment availability while spreading equipment capital costs over larger drilling campaigns.

But purchasing the machine is only step one.

You also need:

• competent drillers;

• supervisors;

• mechanics;

• consumables;

• spares;

• maintenance systems;

• logistics;

• safety systems;

• supporting equipment;

• operational management.

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A 2026 investor document from Aurum Resources illustrates how significant the economics can become at scale: it reported an owner-operated fleet of 16 diamond rigs and approximately US$45/m all-in drilling costs, while stating that comparable contracted drilling in West Africa exceeded US$200/m based on its benchmarking. Those figures are specific to Aurum's operation—not numbers that should simply be applied to another project—but they demonstrate why ownership becomes an interesting discussion when drilling volumes become large enough.

The question isn't:

“Is owning cheaper?”

It's:

“Do we have enough drilling—and enough operational capability—to make ownership cheaper?”

That's an article we're going to tackle separately.

Where CED Fits Into the Equation

This is one reason Cylinder Exploration Drilling approaches equipment differently.

We don't only want to manufacture a drill rig, put it on a truck and wave goodbye.

CED works across the drilling chain.

Depending on the programme, that can mean supplying:

Diamond drilling rigs.Drill rods.Core barrels.Diamond bits and reamers.Casing.Drilling muds.Pumps.Compressors and supporting equipment.Critical spare-parts packages.Drillers and technical personnel.Contract drilling.Complete turnkey exploration drilling packages.

CED manufactures drilling equipment through facilities in Indonesia and South Africa and supports exploration programmes internationally.

That operational side matters.

Because designing equipment becomes rather different when you also understand what happens at 2:00 in the morning when the hole isn't behaving.

So, How Should You Budget a Diamond Drilling Programme?

Don't start with:

Metres × cheapest metre rate = drilling budget.

Start with the actual programme.

Consider the target depth, expected geology, core diameter, hole angles, access, mobilisation, water, consumables, drilling fluids, casing requirements, likely productivity, crew requirements, mechanical support and contingency.

Then look at cost per metre.

Because a cheap metre is only cheap if you actually drill it.

And a drilling programme should ultimately be judged by something more important than how many metres appeared on the invoice:

Did those metres answer the geological question?

What do you think?

Exploration managers and drillers: what cost gets underestimated most often when companies budget a diamond drilling programme—mobilisation, consumables, water, downtime, casing, or something else entirely?

We'd genuinely like to hear the horror stories.

And if you're planning a diamond drilling programme, buying a drill rig, building a consumables package or deciding whether ownership or contract drilling makes more sense, speak to Cylinder Exploration Drilling.

We can sell you the rig.

We can help equip it.

Or we can come and drill the metres.