I Chose the Wrong Crusher for My Mine: A $200,000 Lesson in Equipment Selection

The Day I Almost Killed Our Throughput

Back in September 2022, I was absolutely convinced I’d found the perfect solution for our new greenfield copper project. We needed a secondary crushing stage, and I’d spent weeks comparing specs. The Metso HPGR (high pressure grinding roll) looked incredible on paper—lower energy consumption, higher throughput, fewer fines. I was sold.

What I didn’t realize? I was about to make a classic rookie mistake that would cost us nearly $200,000 in rework and delays.

The Setup: Why I Thought I Had It Figured Out

I’d been in the mining equipment procurement game for about three years at that point. Not a complete newbie, but definitely still learning. My background was in logistics, not mineral processing, so I leaned heavily on vendor brochures and technical specs.

The project: a mid-sized copper concentrator in South America (this was before the big lithium boom, around mid-2022). We needed equipment for the secondary grinding circuit. The options I was comparing:

• Metso HRC™ e HPGR (the new hotness)
• Metso MX™ Multi-Action Cone Crusher (the reliable workhorse)

I looked at the HPGR specs: 70% higher throughput per unit footprint! Lower power draw! Fewer moving parts! It was like reading a sales pitch I’d written myself. I ignored the little voice that said, “Maybe ask someone who’s actually operated one.”

The Mistake: Saving Money the Wrong Way

I pushed hard for the HPGR. I argued that it’d save us money on energy costs long-term—which was true, technically. But I made the classic penny-wise-pound-foolish error: I didn’t account for integration complexity.

The HPGR arrived on time. Installation went smoothly. Then we turned it on.

First problem: the feed size distribution from our existing jaw crusher was inconsistent. The HPGR choked on the coarser particles (we had some plus-60mm pieces slipping through). The system kept tripping its overload protection.

Second problem: the downstream ball mill wasn’t designed for the HPGR’s flaky product shape. We started seeing increased liner wear and reduced mill throughput.

Third problem (the kicker): we needed a screening station to close the circuit, which I hadn’t budgeted for. The HPGR’s recirculating load was way higher than the cone crusher would’ve generated.

The Fallout: When a $200,000 Mistake Actually Costs More

Within three weeks of commissioning, I had to admit failure. We bought the HPGR for about $1.2M (circa late 2022 pricing). Adding the necessary screening equipment cost another $280k. The rework—modifications to the feed chute, adding a bypass, and re-balancing the circuit—pushed another $150k. Total waste (not counting the downtime): roughly $200,000 in unnecessary costs and three months of production delay.

The cone crusher we should’ve bought? About $900k at the time. It wouldn’t have needed the extra screening. Lower complexity. Higher reliability for our application.

The Wake-Up Call: Why I Created Our Selection Checklist

That failure changed how I think about equipment selection entirely. In my opinion, the HPGR is a fantastic tool—for the right application. For our mid-sized, variable-feed operation? It was overkill. We needed the MX cone crusher’s flexibility, not the HPGR’s efficiency.

After the third rejection (meaning the third time my proposal got sent back for revision in Q1 2023), I created a pre-check list that’s now my team’s standard. It’s not rocket science, but it’s prevented at least a dozen similar disasters since. Here’s the core of it:

My 5-Point Equipment Selection Checklist (I wish I’d had this in 2022)

1. Feed size profile: What’s the P80? The top size? HPGRs hate oversize. Cone crushers handle it fine.
2. Downstream compatibility: Does the product shape help or hurt the next stage? HPGR flakes can mess with ball mill liners.
3. Circuit complexity: Does this equipment need extra screening, conveyors, or bins I haven’t specced?
4. Spare parts lead time: Can I get wear parts from Metso’s global network within 48 hours? (For our HPGR, no—they were custom-order and took 6 weeks).
5. Operational skill level: Does my plant team have experience with this tech? If not, factor in training time.

I don’t have hard data on how many mistakes this checklist has prevented across the industry, but I can say anecdotally that we’ve caught 47 potential errors using it in the past two years. That’s 47 orders or projects that could’ve gone sideways.

The Lesson: Prevention Really Is Cheaper

That $200,000 mistake taught me something no textbook could: the cheapest equipment isn’t the one with the lower price tag; it’s the one that fits your process without costly add-ons.

If you’re considering a Metso HPGR versus a cone crusher (or any major equipment choice), my advice is simple: talk to someone who’s already made the mistake. I’m happy to be that person for you.

Note: This pricing data was accurate as of Q4 2022. The equipment market changes fast, so verify current costs with Metso or your local distributor before making decisions. For up-to-date specs, check Metso’s official website (metso.com) or talk to their applications team.