In 1984, Padaeng Industry constructed a zinc refinery in Tak province, 96 kilometres from the Mae Sot Mine, for the production of zinc ingots. The initial production capacity of 60,000 metric tons per year was increased to 72,000 metric tons per year in 1987. In 1988, zinc die-casting alloy No. 3 was added as an additional product, and in 1997, the overall production capacity reached 110,000 metric tons per year.
With the reduction of raw material resources available at Mae Sot Mine, Padaeng Industry changed its smelting process in 1995, and began incorporating calcine as a feedstock. With the new smelting process, Padaeng Industry became one of the few smelters in the world capable of using both zinc silicate and zinc sulphide in the same production process.
2006 : ISO 9001 recertification for quality management system ISO 14001 certification for environmental standards TIS / OHSAS 18001 recertification for management of occupation health and safety standards from SGS (Thailand) 2003 : ISO/IEC 17025:1999 certification for its laboratory quality testing process from the Thai Industrial Standards Institute (TISI)
2005 : Received award for good performing metallurgical plant from Department of Primary Industry and Mines (DPIM), Ministry of Industry 2005 : Received award for the outstanding enterprises in labour relations and labour welfare for 2005 from Department of Labour Protection and Welfare, Ministry of Labour 2005 : Received the outstanding energy conservation award in 2005 from the Ministry of Energy
94 Moo 1, Ban Klonghuaysai Asian Highway 409-410, Nongbuatai subdistrict, Muang district, Tak 63000, Thailand