Who principally owns the parent company of Hindustan Zinc Limited  ?
Hindustan Zinc Hindustan Zinc Limited (HZL) is an integrated mining and resources producer of zinc, lead, silver and cadmium. It is a subsidiary of Vedanta Resources PLC. HZL is the world's second largest zinc producer. Its FY2015 revenues were Rs. 147.9 billion.
New Zealand Aluminium Smelters New Zealand Aluminium Smelter Limited (NZAS) is a joint venture operation owned by Pacific Aluminium (New Zealand) Limited (79.36 per cent) and Sumitomo Chemical Company (20.64 per cent). Pacific Aluminium (New Zealand) Limited, the managing partner, is a wholly owned subsidiary of Rio Tinto.