Zinc and lead concentrate
Zinc and lead concentrates in clean and complex grades from verified mines, for smelters and traders.
Zinc and lead concentrate: typical specification
Indicative- Zinc concentrate
- Typically 45% to 55% Zn
- Lead concentrate
- Typically 50% to 70% Pb, with silver payable
- Penalty elements
- Limits on iron, silica, cadmium, mercury and others
- Moisture
- Typically 8% to 10%
- Shipment
- Bulk vessels, or bagged in containers
- Pricing basis
- Payable metal at exchange prices, less treatment charges
Typical specification for reference. Payable content is settled on the final assay at the discharge or load port, as set out in the contract.
Delivery terms
Documents supplied
Inspected at loading. Paid against documents.
Independent inspection by SGS, Bureau Veritas, Intertek or an equivalent accredited surveyor, with payment by documentary letter of credit.
About zinc and lead concentrate
Zinc and lead are often mined together and separated at the mill into a zinc concentrate and a lead concentrate. Lead concentrate frequently carries valuable silver.
Clean concentrates are low in penalty elements. Complex concentrates contain more impurities and suit smelters set up to handle them.
Frequently asked questions
What makes a concentrate clean or complex?
The level of penalty elements. A clean concentrate can go to most smelters; a complex one needs a smelter that can treat its impurities, and usually earns a lower price.
Is silver paid in lead concentrate?
Usually, above an agreed minimum content, at a payable percentage set in the contract.
How is payment usually made?
By documentary letter of credit from a bank acceptable to the seller, with payment against shipping documents and the inspection certificate.
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