PT Smelting is foreign investment company located in Gresik, East Java. We established in February 1996 as the first copper smelter and refinery in Indonesia, by using advanced Mitsubishi technology with new standard for environment friendly and high efficiency process. PT Smelting comprises three factories, a smelter; a refinery; and a sulphuric acid plant; and processes copper concentrate produced by Freeport-McMoran subsidiary Freeport Indonesia.

The plant was originally designed to produce 200,000 TPY of "LME Grade A" copper cathode from 660,000 TPY of copper concentrate supplied by domestic mining companies. Currently copper cathode production level has been expanded to over 300,000 TPY, with priority of it is sold for Indonesian market and the rest is exported to Asian market. By-products of sulfuric acid, granulated slag and gypsum are delivered to local market, and anode slime and copper telluride are exported to international market.