Boliden owns and operates two zinc and two copper smelters and one lead smelter. Top-jetting lance smelters include the Mitsubishi smelting reactor. Our smelters and refineries will close down. The proximity to larger ore deposits favored larger, more permanent iron smelters. Trafigura has built or purchased stakes in pipelines, mines, smelters, ports and storage terminals. Copper, gold, palladium, silver and tin are valuable metals sold to smelters for recycling. Sulfuric acid is recovered at copper smelters. Pollutants generated by other types of smelters varies with the base metal ore. Two aluminium smelters, Hillside Aluminum and Bayside Aluminium are operated by South32. Free miners owned shares of the operation, proportional to their ownership of copper smelters. There are three operating copper smelters in the United States. Two copper smelters operated at the site. These gases result from electrical consumption of the smelters and the byproducts of processing. The Alcasa aluminum plant and at least three other iron smelters also shut down. His work also included trading with major Russian aluminium smelters.