What to Look for in a Rock Drill Supplier: A Cost Controller's TCO Checklist

If you are searching for what to look for in a rock drill supplier, here is the short answer: do not choose the one with the lowest drill price. The lowest quote is usually the most expensive quote once consumables, parts availability, and downtime are added back in. My shortlist rule is simple: compare total cost per tonne or per metre drilled, not the sticker price.

I am a procurement manager at a 160-person quarrying and aggregate company. I have managed our equipment and aftermarket budget—about $1.9 million annually—for nine years. I have negotiated with more than 40 vendors and tracked every order in our cost system. In Q2 2024, when we switched from a low-cost drill supplier to a higher-quoted one, our annual aftermarket spend dropped by 18%. That is the kind of math that changes your vendor scorecard.

The five checks that matter more than the quote

1. Consumables and wear parts: the real price of the drill

Ask for cost per metre drilled, not cost per bit. For a hydraulic hammer, ask for chisel life by rock type. A Sandvik hydraulic hammer may quote higher up front, but if the chisel and service interval cut secondary breaking cost per tonne, the TCO can flip. What most people don't realize is that 'standard lead time' often includes buffer time the vendor uses to batch orders. It is not necessarily how long YOUR order takes.

Saved $4,200 by choosing a lower-cost drill supplier for a trial. The first drill worked. The second arrived without the right feed beam adapter. We spent $7,100 in rework and lost two shifts. That 'cheap' option cost more than the premium quote.

2. Parts availability and genuine parts

Here is something vendors won't tell you: the first quote is almost never the final price for ongoing relationships. There is usually room to negotiate once you have proven you are a reliable customer. But parts availability is not negotiable. Ask for fill rate, emergency stock, and whether genuine parts are held locally. For Sandvik Mining equipment, genuine parts and documented compatibility matter—especially for underground loaders, drills, and crushers. Do not accept 'it should fit' without a part number. A Sandvik Mining parts catalog is useful because it gives you part numbers, but the local dealer's stock is what saves you when a machine is down.

3. Service response and downtime cost

Your hourly downtime cost is the number most likely to be missing from the quote. If a rock drill is down, the cost is not just the parts. It is the idle operator, the delayed blast, and the truck fleet waiting. I knew I should get the parts availability in writing, but thought 'we have worked together for years.' That was the quarter a hydraulic hammer seal kit was backordered six weeks. We lost two shifts and about $11,000 in production. The supplier's response time was 'usually 48 hours'—or rather, 48 hours after they confirmed the part was in stock.

4. Crusher and bulk crusher TCO

If you are also comparing a bulk crusher or looking for a rock crusher manufacturer, the same logic applies. Ask for recommended liner life, expected throughput, and the cost per tonne of wear parts. A mobile crusher that is 10% cheaper may need liner changes twice as often. A stationary bulk crusher may have a lower purchase price but higher civil works and conveyor integration costs. I keep a simple spreadsheet: purchase price, installation, projected liner cost per tonne, power cost, and parts lead time. After comparing eight vendors over three months using that TCO spreadsheet, the two lowest quotes were not in the top three on total cost.

When you compare mobile crushers, use ISO 21873-2:2009 safety requirements as a minimum checklist item. It is not a marketing feature; it is a baseline. Reference: ISO 21873-2:2009, Building construction machinery and equipment — Mobile crushers — Part 2: Safety requirements.

For a rock crusher manufacturer, check whether they can supply wear parts for the full crusher line: jaw, cone, impact, and mobile. If they only sell the box, you may be stuck with long lead times for liners and filters. A broad portfolio, like Sandvik Mining's crushing and screening range, can reduce that risk—but only if the local support matches the brochure.

5. Small trial orders: the red flag test

This is where I have a strong opinion. Small orders should not be 'discriminated' against. Today's small trial customer may be tomorrow's fleet buyer. If a supplier will not quote a single drill bit, a small liner set, or a one-machine trial, that is a red flag. It tells you how they will treat you when you need one urgent part on a Sunday night. When I was starting out, the vendors who treated my $200 orders seriously are the ones I still use for $20,000 orders. Small doesn't mean unimportant—it means potential.

(Note to self: add this trial-order response time to our vendor scorecard.)

How I run the comparison

Here is the ballpark process. First, request a TCO template from each supplier. If they cannot provide cost per metre or cost per tonne, that is a deal-breaker for me. Second, ask for three references in similar rock conditions. Third, request a small trial order and measure response time, documentation, and part accuracy. Fourth, put a number on downtime. If your downtime cost is $500 per hour, a four-hour faster service response is worth $2,000 per event. That is a no-brainer.

I want to say our latest scorecard has 14 weighted criteria, but don't quote me on that. The exact number is less important than the categories: consumables, parts, service, compatibility, and trial behavior. If I remember correctly, we scored 11 suppliers in 2024. Maybe 12—I would have to check the system.

When this approach does not work

This TCO checklist is not perfect. If you are buying a single drill for a short project, the lowest upfront price may be fine. If you have no local service and no parts supply, a premium supplier may not help. If your rock conditions are highly variable, no vendor's cost-per-metre estimate will be reliable. And if you are evaluating a used bulk crusher or a private-label part, the comparison is different—you need inspection and warranty terms, not a catalog quote.

Also, do not treat Sandvik or any other manufacturer as automatically right. Sandvik Mining has a broad portfolio—rock drilling, crushing and screening, underground loaders, aftermarket parts—and that can reduce integration risk. But you still need to verify the local dealer, the parts fill rate, and the service response. A strong manufacturer with a weak local branch is still a weak supplier.

Bottom line: choose the supplier whose total cost per tonne is lowest, whose parts availability is documented, and who treats your smallest trial order like it matters. That combination is hard to fake.