The trader supplies tin concentrate to the Thai smelter Thaisarco, which does not price or pay for the material until after it has arrived and been authenticated. Fifty containers would hold 1,250 metric tonnes of tin concentrate and Brazilian concentrate would yield 875 tonnes of metal. In addition to selling tin to Thaisarco, Gerald typically sends tin concentrate to Malaysia Smelting Corp (MSCB.KL) to turn into metal in a process known as tolling. Tin concentrate from Brazil typically contains about 70% metal. With regional variations, tin concentrate also contains byproducts or impurities such as iron, antimony, bismuth, lead and silver.

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Persons: Gerald Group, Gerald, Andrew Davies, Pratima Desai, Veronica Brown, Barbara Lewis, Catherine Evans Organizations: Reuters, London Metal Exchange, Malaysia Smelting Corp, Geological Survey, Thomson Locations: Brazil, Asia, London, Thaisarco