Peru pays the same for high chrome grinding balls as for plain steel ones

Martín Garay

Published July 2026 · Data through June 2026

All the figures

High chrome grinding balls land in Peru at $1,030 a tonne. Plain steel ones land at $1,040.

That is the whole finding, and it is uncomfortable for an industry that sells on metallurgy.

Grinding media is the most repetitive input in mining. A concentrator loads steel balls into a mill, the mill turns, the balls wear away against the ore, and somebody reorders. The wear rate is the product. It is what the alloy is for.

And at the border, the alloy is worth nothing.

What was measured

Every shipment of grinding media arriving in Peru since the start of 2024, split by what the description declares. The families that mention chrome, the families that mention only steel, and the families that describe themselves as grinding material.

They land within ten dollars of each other per tonne.

Three checks

The first was the direction of the whole category. The landed price has been sliding for three years, from $1,550 a tonne down to $1,100.

The grades slide together, so this is not a case of one holding up while another falls.

The second was the unit. The paperwork reports kilos, but the trade is quoted by the tonne, and the smaller consumables by the piece. Reading price per piece instead of per tonne does not open a gap either.

The third was the shape of the market. There are 659 active importers, and ten of them hold 79.3% of the value.

If a premium for grade existed anywhere, it would show up in what those large accounts pay. It does not.

Why this happens

The value of a grinding ball is not visible on the invoice. It shows up in the mill, months later, as tonnes of ore processed per kilo of steel consumed.

A purchasing system that compares quotes on a screen has no field for that. So it compares the field it has, which is price per unit landed.

The metallurgy is real. The place where it is measured is somewhere else entirely, and nothing carries it back to the moment of the decision.

What that means for a supplier

Two things follow, and the second one is the useful one.

The first is defensive. A quote for high chrome is going to be compared against plain steel as if they were the same object, because in the buyer's spreadsheet they are. Expecting the price to defend itself is expecting a spreadsheet to know metallurgy.

The second is where the opening sits. The only thing that moves this argument is consumption data from a plant that already ran the product. Kilos of media per tonne of ore, before and after, from a mill of comparable size and comparable hardness.

That number is not a marketing claim. It is the same kind of number the buyer already uses to run the plant, which is why it lands.

One more detail worth carrying

The supplier brands appear inside the import descriptions themselves. This is not an anonymous commodity trade where nobody knows who made what.

The market already tracks who supplied which lot. What it does not track, and what nobody has put in front of it, is what each lot did once it was in the mill, and that gap is where a supplier carrying mill data gets paid for the metallurgy.