The question "which crusher?" usually gets a catalogue answer: the model the supplier has in stock, or the one the neighbouring site bought. It deserves better. A crusher is chosen for a rock, a feed size, a product size, a throughput and a place in the circuit. Change any one of those five and the right answer changes.
This article walks through the four types found in mines, quarries and cement plants — jaw, gyratory, cone, impact — and then the questions that settle the choice.
Two families: compression and impact
It starts with how the rock is broken.
Compression crushers — jaw, gyratory, cone — squeeze the rock between two surfaces, one fixed, one moving. They suit hard, abrasive rock because the wear surface works slowly and the energy is applied by pressure, not by shock. Their product tends to contain elongated or flaky particles.
Impact crushers — horizontal shaft impactors (HSI), vertical shaft impactors (VSI) — throw the rock against plates or shatter it by collision. They fragment more in a single pass and give a more cubical product, but their wear parts suffer quickly as soon as the rock is abrasive.
That distinction already settles much of the choice: a granite or a quartz-rich ore goes to compression; a soft limestone goes to impact.
The jaw crusher
A fixed jaw, a swing jaw driven by an eccentric, a rectangular opening at the top, a setting at the bottom. It is the most common primary crusher on small to mid-sized plants, and the simplest to understand, maintain and move.
What it does well: accept large lumps relative to its size, handle hard and abrasive rock, run on intermittent feed, sit on a modest foundation, and be dismantled and reassembled for a mobile or semi-mobile installation.
Where it shows its limits: throughput, which stays moderate compared with a gyratory of the same opening; reduction ratio, lower in a single pass; product shape, often flaky; and feed-opening blockages, when a flat or elongated rock lies across the throat instead of dropping through. On sites where that blockage is frequent, an unblocking boom suited to the rectangular geometry of the opening is part of the installation from day one.
The gyratory crusher
A conical main shaft gyrating inside a fixed shell lined with concaves, fed from the top around the full circumference, discharging through an annular gap. It is the primary crusher of large plants: it runs continuously, accepts direct truck dumping through a hopper and handles high tonnages with a crushing area far larger than a jaw of the same opening.
What it does well: tonnage, continuity, hard rock, direct dumping. Its geometry means it "swallows" without needing a feeder upstream.
Where it shows its limits: cost and foundation work — a primary gyratory is deep, heavy and demands a structure to match; heavier concave and mantle maintenance; and bridging of the feed ring by oversize rock, which stops the whole circuit until the rock is broken. On a gyratory, what a blockage costs is measured in tonnes per hour of the entire plant.
The cone crusher
Same principle as the gyratory — a mantle gyrating inside a bowl — but a shorter, flatter chamber, a finer setting and a design intended for the secondary or tertiary stage, never for raw run-of-mine lumps. The chamber profile (standard or short head) is chosen according to the feed size and the target product.
What it does well: produce a consistent size from an already pre-crushed feed, withstand hard and abrasive rock, adjust on the run, and lend itself to automation (closed-side setting and power control).
Where it shows its limits: it requires a steady, well-distributed feed, ideally choke-fed — irregular feed degrades the product and wears the chamber unevenly; it does not tolerate tramp iron (bucket teeth, bar stock), which has to be detected upstream; and it works no miracles in reduction: a tertiary circuit is not replaced by a bigger cone.
The horizontal shaft impactor (HSI)
A fast rotor fitted with blow bars throws the rock against adjustable impact aprons. The HSI is the crusher of limestone, dolomite and soft to medium-hard rock — the one found in cement plants and many aggregate quarries.
What it does well: a high reduction ratio in a single stage, which sometimes allows a crushing stage to be eliminated; a cubical product sought after for concrete and asphalt; a compact machine for its throughput.
Where it shows its limits: abrasiveness. On siliceous rock, blow bar and apron consumption becomes the largest operating cost and can disqualify the machine regardless of its fragmentation performance. Moisture and clay also pack the chamber. And when a rock jams in the feed chute, right next to the rotor, clearing it calls for a specific boom geometry so that the rotor does not have to come out.
Summary table
| Type | Usual stage | Rock | Strengths | Watch points |
|---|---|---|---|---|
| Jaw | Primary | Hard, abrasive | Simplicity, large lumps, mobility | Moderate throughput, flaky product, feed-opening blockage |
| Gyratory | Primary | Hard, abrasive | High tonnage, direct dumping | Heavy foundation, feed-ring bridging |
| Cone | Secondary, tertiary | Hard, abrasive | Consistent product, on-the-run adjustment | Steady feed required, tramp iron |
| Impact (HSI) | Primary or secondary | Soft to medium, low abrasion | High reduction, cubical product | Rapid wear on abrasive rock, packing |
The four questions that decide
1. What rock, exactly? Compressive strength, abrasiveness (a measured abrasion index, not a guess), moisture and clay content, fines. That data often exists in the deposit's geological study; if not, a laboratory test on a sample costs little compared with the mistake it prevents.
2. What feed size and what product size? The largest admissible lump sets the opening. The target product, with its size curve, sets the number of stages and the type at each stage. The ratio between the two — the total reduction — says whether one crusher is enough or three are needed.
3. What throughput, and how does it arrive? A nominal throughput, but also a peak throughput and a feeding mode: trucks dumping directly, a loader, a conveyor, an apron feeder. The gyratory takes direct dumping; the cone needs a feeder and even distribution.
4. What site constraints? Available height, existing foundation, maintenance access, available electrical power, shutdown window for installation or replacement, climate. A good crusher that does not fit in the building, or cannot be installed within the shutdown window, is the wrong choice.
The choice does not stop at the machine
Three decisions go with the crusher type and weigh as much on the outcome: the blockage-handling arrangement, which depends on the type chosen — see how to size an unblocking boom and the IC Boom System product page; the list of wear parts and critical spares to hold on site, especially if the site is remote; and the installation itself, planned inside a shutdown window with the interface review that goes with it.
That scope — selection, supply, installation, commissioning, parts — is what our equipment sales and supply service covers, for mining as well as for cement plants and quarries. For a specific case, tell us about your rock and your throughput: that is the starting point of any serious recommendation.
Frequently asked questions
Can an impact crusher be used on granite? Technically yes, economically rarely: blow bar wear on siliceous rock makes the cost per tonne prohibitive. On hard, abrasive rock, compression (jaw, gyratory, cone) is the norm.
Can a jaw crusher replace a gyratory? For moderate tonnages, yes, and at a lower installation cost. Beyond that, the gyratory wins on continuity and capacity; the crossover point depends on tonnage, rock and feeding mode, and is worked out case by case.
Does it have to be a new crusher? Not always. A rebuilt crusher can be suitable if its condition is documented and parts are available. The question is settled on total cost over the service life, not on purchase price alone.
Hicham Marouazi, ing., PMP
Engineer and project manager (PMP) at Induscoat Solutions. Over 16 years of experience on mining, energy and petrochemical sites in Canada and internationally — selecting, installing and commissioning industrial equipment.