The largest quarry in the state, and it does not make aggregate
Specialty Granules records 186 employees here, 0.46 miles from the middle of town. That makes it the largest crushed-stone operation researched anywhere in Missouri — ahead of Tower Rock at 170 — and the third largest of the 2,122 in this whole body of work, behind one in Alabama at 280 and one in Florida at 205.
What it produces is not construction aggregate. It makes roofing granules: coloured, sized, ceramic-coated chips bonded onto asphalt shingles. Together with a second operation over in Wayne County that is 250 people in this state making a product most people have on their roof and have never heard of.
It is a genuinely different business from a quarry, and three things follow for equipment. The product is made to a colour and a size distribution rather than to a gradation for concrete or road base, and it is fired and coated rather than only crushed. So production runs to a factory schedule rather than a construction season, and utilisation stays flat across the year.
So the fleet here ages in an unusual order
That flat schedule is the first consequence. The second is about where the output goes: it leaves largely by rail to a small number of shingle plants rather than by truck to many job sites, so employment and tonnage stop predicting road mileage altogether. A 186-person operation here may put fewer highway miles on a machine than a nine-person pit does.
The third follows from both. An on-site fleet weighted towards plant and yard work rather than highway haulage ages tyres, hoists and low-speed driveline ahead of engines. That is close to the opposite of what a long-haul machine looks like at the same age, and it is worth saying when one changes hands.
What is established is the employment, the operator name and the product class the industry associates with it.
The rock is unusual too. This is the St Francois Mountains, the exposed igneous core of the Ozark dome and the only part of Missouri where the quarrying is not carbonate. Rhyolite, granite and trap rock are much harder than limestone, so a full body weighs more for the same volume and the material is harder on liners, tailgates and tyres. Within ten miles ten structures are rated below legal loads, the nearest 1.29 miles out, and Iron County restricts 8 of 40.
Dump trucks and aggregate haulers off the granite.
Around the granite works, and across Iron County and Wayne County, there is usually one sitting.