Thailand Smelting and Refining Co., Ltd., more commonly known as THAISARCO, was established in 1963 for the smelting and refining of domestically mined tin ores. Today, THAISARCO is recognised worldwide as an industry leader in the manufacture of tin, tin alloys and tin-related products.

From its LME registered THAISARCO and PHUKET brands of pure tin to high purity tin, specialty alloys, powders, and extruded products, THAISARCO specialises in solutions tailored to meet its customers' needs.

THAISARCO commenced operations on July 29, 1965. It became part of Billiton BV of the Netherlands, a member of The Royal Dutch Shell Group in 1972.

Since 1995, THAISARCO has been managed and operated by its majority shareholder Amalgamated Metal Corporation PLC of the UK with a minority shareholding held by Escoy Holdings of Malaysia.

THAISARCO has gained international recognition and accreditation by the London Metal Exchange as a producer of "THAISARCO" Brand tin (99.9+% purity) and "PHUKET" Brand tin (99.85+% purity), conforming to BS EN 610:1996 and ASTM Grade A B339-19 specifications.