Hindustan Zinc is the largest integrated Zinc producer in India and owns captive zinc mines that supply all of Hindustan Zinc’s Zinc concentrate requirements for its smelters. Hindustan Zinc operates three underground mines (Sindesar Khurd, Rajpura Dariba, and Zawar Mines) and one open cast mine Rampura Agucha Mine being one of the most cost-efficient Zinc mines in the world