Next process, tin ores has to undergo a smelting process into tin metal. To obtain the best quality of low lead tin metal, refining process is needed by using purifying device called crystallizer equipped with electrolytic refining. Here, the company operates 12 furnaces, of which 1 furnaces in Kundur, Riau Islands and 11 furnaces in Mentok, Bangka. Final products are in form of bar tin metal with average weight of 16 kg to 30 kg per bar. In addition, tin metal’s size and shape are variable (customized) according to customer’s requirements which trademark are listed in London Metal Exchange (LME).