Concentration changes the mix
Some silver-bearing ores are processed into mineral concentrates before further treatment. Crushing and grinding help prepare the feed; separation methods can then enrich selected minerals into a smaller product stream. The concentrate still contains minerals and other material. It is not automatically refined silver. A process diagram should therefore distinguish the ore entering a plant, the concentrate leaving it and any metal produced later by a smelter or refinery.
Silver can travel with other metals
The route depends on the ore. Pan American Silver’s La Colorada technical report, for example, describes sulphide processing that produces lead and zinc concentrates, while a separate oxide route produces doré. That operation illustrates why one universal silver flowsheet would mislead. A shipment described as lead or zinc concentrate may also carry payable silver. The name of the main product is not a complete inventory of every valuable element within it.
Payability is a commercial boundary
An assay establishes measured metal content; a concentrate contract determines the quantity or fraction for which payment is made. Payability provisions can include deductions or minimum thresholds. Treatment and refining charges are separate commercial items. Published company examples show that their structure differs between concentrate types. These arrangements should be read as specific contract economics, not a universal rule that every tonne of concentrate receives payment for every contained gram.
Follow the units all the way to revenue
A mine’s recovered production and its payable sales can therefore differ without describing the same measurement incorrectly. Timing, product terms and subsequent treatment matter. To understand an estimate, identify the ore grade, process recovery, concentrate composition and payable-metal assumptions before considering the relevant price and charges. The useful lesson is a sequence of distinct questions: what entered the plant, what reached the product, and what the buyer actually agreed to pay for.
Sources & further reading
- CIM — Glossary for the Leading Practice Guidelines for Mineral Processing ↗
- Pan American Silver — La Colorada technical report, 2026 ↗
- Pan American Silver — Model Workshop, concentrate terms ↗
Sources checked 14 November 2026. Reference organisations do not endorse this website. Price examples are hypothetical and educational.