The Porto Vesme ISF was commissioned in 1972 with a design capacity of 72kt/a zinc. In 1995 the ISF was uprated by enlarging the hearth and shaft areas to a new capacity of 90kt/a zinc. High Italian power prices have had a major adverse effect on the economics of Porto Vesme. In January 2005 Glencore put the future operation of the ISF smelter under review and in February the plant was closed. It is assumed in this analysis that the smelter will not restart.