How Copper Pricing Works: The LME, Processing Margins & Volume Tiers

First-time buyers often ask why a copper supplier won't just publish a fixed price. The answer is simple: copper trades on a global exchange and moves every day. A good quote isn't a number pulled from the air — it's a transparent calculation anyone can follow. Here's how it works.

It starts with the LME

The London Metal Exchange (LME) is the world's reference market for copper. Its daily settlement price — quoted per tonne — is the benchmark virtually every physical copper deal is built on, from cathode delivered to a rod mill to a container of scrap shipped from Miami. Because the LME moves with global supply and demand, the underlying value of your copper changes daily. That's why a price printed on a website is out of date almost as soon as it's published, and why bulk copper is quoted live at the time of order.

Then comes the grade discount (or premium)

No two grades are worth the same relative to the LME. The benchmark itself references high-purity refined metal, so:

• Copper cathode (99.99%, LME Grade A) trades closest to — sometimes above — the benchmark.
• Mill berry (No.1 bare bright, ISRI Barley) earns a small discount because it's clean scrap needing minimal processing.
• Mixed wire scrap carries a wider discount that reflects lower, more variable yield and the processing required.

See our copper grades guide for how each grade compares.

The transparent processing margin

On top of the LME-linked value, a supplier applies a processing margin — the cost of sorting, grading, cutting, documentation, and handling, plus a working margin. The key word is transparent: a fair quote shows you the benchmark it references and the margin applied, so you can check it against the market yourself. At Atlas Copper, sell rates track the LME daily with a transparent processing margin, and indicative live rates are shown in the ticker on the homepage.

Volume tiers

Copper has real economies of scale — a full truckload or a five-container export lot costs less per tonne to handle than a single pallet. That's why volume tiers apply: the larger the order, the better the rate. Tier-based volume pricing is also a benefit of an approved trade account, alongside priority cut-to-size service and NET 30 terms.

Putting it together

Your final price is essentially:

LME benchmark (today)  ±  grade discount/premium  +  transparent processing margin  −  volume-tier adjustment

Because the first term changes daily, the right time to lock a price is at the point of order. Tell us the grade and volume, and we'll quote it live against the current LME.

Frequently asked questions