Assets included mines in Mount Isa and Rosebery, and smelters in Budel (The Netherlands), Clarkesville (United States), Hobart and Port Pirie.

[4][5][6] After floating on the ASX, Zinifex proved successful mainly due to the company keeping no hedges in place, and benefiting from rises in the zinc price.

[8][9][10] Zinifex Limited was engaged in minerals exploration, production and smelting to produce zinc and lead concentrates, and zinc, lead and silver metals together with various alloys and byproducts, and the marketing of these products.

The segments of the company included Century Mine in Mount Isa, a large open cut zinc, lead and silver mine, operating on a mining lease secured for at least the life of the mine; Rosebery Mine in Rosebery, Tasmania, a medium-sized underground zinc, lead, silver, gold and copper mine; Port Pirie Smelter, a primary lead smelting facility; Australian Refined Alloys, an acid battery and lead recycling business owned 50% by Zinifex in a joint venture with Sims Metal Management; Budel Smelter, an electrolytic smelter, and Clarksville Smelter, a modern smelter to access a large portion of the United States zinc market.

[11][12] In December 2006, Zinifex announced it would merge its smelting operations with those of Umicore,[13] to form Nyrstar that was floated in October 2007.