How Much Is Copper Concentrate Per Ton? The Pricing Formula, Worked Through

Why there is no headline price

Copper concentrate is not a finished product with a market price. It is an intermediate material whose value depends on how much copper it contains, how much of that copper a smelter will pay for, what the smelter charges to process it, and what deductions apply for moisture and impurities. Two lots described as "copper concentrate" can differ in value by a factor of two.

So when a buyer asks how much concentrate costs per ton, the useful answer is the formula rather than a number — because the number is only meaningful attached to a specific assay and a specific date.

The formula

The industry standard calculation, per dry metric tonne, is:

Start with

Payable Cu% × LME reference price

Deduct

Treatment charge (TC), quoted per dry metric tonne

Deduct

Refining charge (RC), quoted per pound of payable copper

Deduct

Penalties for deleterious elements above contract thresholds

Add

Credits for payable gold and silver, where present

Payable copper is not contained copper

A smelter never pays for 100% of the copper in the concentrate, because some is lost in processing. The payable proportion is normally around 96 to 97% of the assayed copper content, and it is a contract term rather than a physical constant — it is negotiated, and a lower payable percentage is a real cost even when the headline grade looks attractive.

This is the first place where offers stop being comparable. A 30% Cu concentrate at 96.5% payable is a different proposition from the same grade at 95% payable, and the difference does not appear anywhere in the product description.

Treatment and refining charges

TC and RC are what the smelter charges to turn concentrate into metal, and they are effectively the seller’s cost of access to processing capacity. TC is quoted in US dollars per dry metric tonne of concentrate; RC in US cents per pound of payable copper. They move with global smelting capacity and concentrate availability, tightening when smelters compete for feed and widening when concentrate is scarce.

For a buyer, the important point is that TC/RC must be stated explicitly. An offer that quotes a flat dollar figure per tonne without disclosing the payable percentage and the treatment terms has hidden the two variables that determine what you are actually paying.

Moisture and the dry metric tonne

Concentrate is shipped wet, typically at 6 to 10% moisture, but settlement is on dry weight. Moisture is determined at inspection and deducted from the shipped tonnage, so a 1,000 wet metric tonne shipment at 8% moisture settles as 920 dry metric tonnes.

Getting the basis wrong is one of the more common commercial errors on a first transaction. Always confirm whether a quoted price is per DMT or per WMT, and whether the moisture determination is by the loading inspector, the destination inspector, or an agreed umpire.

A worked example

Take a 28% Cu concentrate, 96.5% payable, with the LME at a given reference. Payable copper per dry tonne is 0.28 × 0.965, or roughly 0.270 tonnes of copper. That figure multiplied by the LME reference gives the gross value per dry metric tonne, from which TC per DMT and RC per payable pound are deducted, along with any arsenic or bismuth penalties, before adding precious-metal credits.

The point of running it is comparability. Once you can calculate the number yourself, an offer that will not disclose payable percentage, TC/RC and penalty thresholds is visibly incomplete rather than merely competitive.