Indonesian Firms, CHALCO Agree to Build US$1 bn Alumina RefineryDec 17, 2015 . (CHALCO) to build a US$1 billion smelter-grade alumina refinery in Mempawah, West Kalimantan, Indonesia. The three-year project will build.alumina refinery in indonesia,PROMISING ALUMINA REFINERY PROJECTS IN INDONESIA .Jul 19, 2015 . Hi Friends,. As discussed in previous articles, about 89% of alumina produced in the World is used for manufacture of aluminium metal and.