Horsehead Holding Corp. is a producer of zinc and nickel-based products sold primarily to customers throughout the United States of America and Canada. The Company is also a recycler of electric arc furnace (EAF) dust in the United States and a recycler of hazardous and non-hazardous waste for the specialty steel industry. It also provides short-line railroad service for the movement of materials for both the Company and outside customers. The Company's wholly owned subsidiaries include Horsehead Corporation (Horsehead), Chestnut Ridge Railroad Corp., Horsehead Zinc Recycling, LLC, Horsehead Metals Development, LLC, Horsehead Metal Products, LLC (HMP), The International Metals Reclamation Company, LLC (INMETCO), Zochem Inc. (Zochem), and Horsehead Zinc Powders, LLC (HZP). The Company operates as three business segments, which include Horsehead, INMETCO and Zochem.