Horsehead Holding Corp. is a holding company. The Company operates through its subsidiaries, Horsehead Corporation (Horsehead), The International Metals Reclamation Company, Inc. (INMETCO) and Zochem Inc. (Zochem). Horsehead is a producer of specialty zinc and zinc-based products and a recycler of electric arc furnace (EAF) dust. INMETCO is a recycler of nickel-bearing wastes and nickel-cadmium (Ni-Cd) batteries in North America. Zochem is a producer of zinc oxide. The Company operates in two business segments, zinc products and services, and nickel products and services. Horsehead operates four waste recycling facilities for the recovery of zinc from EAF dust. INMETCO operates high temperature metals recovery facility, which utilizes a combination rotary hearth furnace and electric arc smelting furnace to recover nickel, chromium and iron from a variety of metal-bearing waste materials, generated by the specialty steel industry.