Xikuangshan (or Hsikwangshan) is known as Antimony City because the company s capacity to produce antimony and downstream products is the largest in the world. Construction of the zinc smelting plant commenced in 1996 as a business diversification the initial vertical retort capacity being 15kt/a. By installing a second roasting and sulphuric acid stream and by doubling the number of retorts and distillation columns the capacity of the smelter was increased to 35kt/a slab zinc in 2001. During 2012 in order to avoid inter company competition with Zhuzhou Xikuangshan moved to produce high purity zinc by the installation of a vacuum distillation column. With this move the total capacity of the smelter decreased to 20kt/a made up of 15kt/a high purity zinc capacity and 5kt/a normal refined zinc capacity.