Dry basis
DMT = WMT × (1 − moisture). The contract should define the basis used for weights, assays and payment.
Concentrate specifications
Headline
grade is only
one part of a
commercial product.
We look at concentrate quality through the eyes of both the plant and the buyer. A product has to perform metallurgically, travel safely, meet moisture and impurity limits and ultimately deliver an acceptable commercial result.
Concentrate quality
Minimum product sheet.
We expect the product sheet to describe the complete concentrate, not only the headline Cu or Au grade.
| Parameter | Typical unit | Why it matters |
|---|---|---|
| Cu | % | Principal metal for copper concentrate; method and reporting basis should be consistent. |
| Au | g/t | Can contribute significant value; payable terms depend on the contract. |
| Ag | g/t | Common by-product metal; deductions or thresholds may apply. |
| As / Sb / Bi / Hg | %, ppm or g/t | Penalty or restricted elements depending on buyer and contract. |
| Pb / Zn | % | Can affect product quality, smelting behavior or commercial terms. |
| F / Cl | ppm or % | May be relevant to acceptance and penalties in some markets. |
| Moisture | % | Critical to convert WMT to DMT and for handling/shipment; cargo-specific requirements may apply. |
| Size / stability | Distribution | Affects handling, segregation, filtration and delivery consistency. |
Commercial bridge
From laboratory to contract.
We translate analytical results into parameters that can actually enter a settlement calculation and a logistics operation.
Payables
Contained metal becomes payable metal by applying the agreed purchase terms.
Penalties
Limits, scales and charges are product- and buyer-specific and should be modeled explicitly.
Moisture & shipment
Moisture affects DMT and handling. Where applicable, relevant transport requirements must be met, including TML for cargoes classified accordingly.
Concentrate traceability
Control product identity.
We keep the commercial sample and export lot linked to the product actually packed and dispatched so the specification remains tied to the real shipment.
Batch / blend
Sample
Assay
Wet weight
Moisture / DMT
Packing
Export