Tin smelting Heart owned by the corporation is found in Mentok, Bangka and Kundur in Riau. Each smelting units have a total of 12 models of furnaces. To further improve the quality of the raw content tin ore, the corporation also includes a center of tin ore leaching (washray). Both https://mariotwwaz.amoblog.com/fascination-about-kacamata-anti-radiasi-52351983