Question: Who principally owns the parent company of Hindustan Zinc Limited  ?

full_context: Document 1: Coal India: Coal India Limited (CIL) is an Indian state-controlled coal mining company headquartered in Kolkata, West Bengal, India. It is the largest coal producer company in the world and contributes around 82% of the coal production in India. It produced 494.24 million tonnes of coal during FY2014–15 and earned a revenue of () from sale of coal in the same financial year. As on 14 October 2015, Union Government of India owns CIL and controls the operations of CIL through Ministry of Coal. In April 2011, CIL was conferred the Maharatna status by the Union Government of India. As on 14 October 2015, its market capitalisation was () making it India's 8th most valuable company by market value.
Document 2: Adani Group: Adani Group is an Indian multinational conglomerate company headquartered in Ahmedabad, Gujarat, India. Its diversified businesses include resources, logistics, agribusiness and energy sectors. The Group is the largest port developer and operator in India with Mundra Port being a commercial port. It owns Fortune, India’s largest edible oil brand through a joint venture with Wilmar International in Singapore. The Flagship Company of the Adani group is "Adani Enterprises Limited". In April 2014, it added the 4th unit of 660 MW at its Tiroda Power plant, making Adani power the largest private power producer of the country. In 2015, Adani was ranked India's most trusted infrastructure brand by The Brand Trust Report 2015.
Document 3: Korea General Zinc Industry Group: Korea General Zinc Industry Group (Chosongul: 조선아연공업총회사) is a North Korean mining and industrial group headquartered in Pyongyang. The group produces zinc, lead, base bullion, lead concentrates, zinc concentrates, cadmium, arsenic, zinc residues and copper concentrate for export and domestic use. The group imports some industrial and mining accessories, including industrial chemical reagents and animal feed.
Document 4: Anglo American plc: Anglo American plc is a multinational mining company based in Johannesburg, South Africa and London, United Kingdom. It is the world's largest producer of platinum, with around 40% of world output, as well as being a major producer of diamonds, copper, nickel, iron ore and metallurgical and thermal coal. The company has operations in Africa, Asia, Australasia, Europe, North America and South America.
Document 5: Oil and Natural Gas Corporation: Oil and Natural Gas Corporation Limited (ONGC) is an Indian multinational oil and gas company headquartered in Dehradun, Uttarakhand, India. It is a Public Sector Undertaking (PSU) of the Government of India, under the administrative control of the Ministry of Petroleum and Natural Gas. It is India's largest oil and gas exploration and production company. It produces around 77% of India's crude oil (equivalent to around 30% of the country's total demand) and around 62% of its natural gas.
Document 6: Rampura Agucha: Rampura Agucha is a zinc and lead mine in the Bhilwara district of Rajasthan, India. It has world's largest deposits of zinc and lead. The mine is owned by Hindustan Zinc Limited (HZL).
Document 7: Vedanta Resources: Vedanta Resources plc is a global diversified metals and mining company with its headquarters in London, United Kingdom. It is the largest mining and non-ferrous metals company in India and has mining operations in Australia and Zambia and oil and gas operations in three countries. Its main products are copper, zinc, aluminium, lead, iron ore and petroleum. It is also developing commercial power stations in India in Odisha (2,400 MW) and Punjab (1,980 MW). The company is principally owned by Indian billionaire Anil Agarwal through Volcan Investments, a holding vehicle with a 61.7% stake in the business.
Document 8: Zhongjin Gold: Zhongjin Gold is a Chinese mining corporation mainly focusing on non-ferrous metals, such as gold, copper, and platinum. They are China's largest gold producer. The corporation is based in Beijing, and holds mines in across China. They recently acquired two large gold production companies in Shandong, after winning a bidding war against Shandong Gold. The company's largest single gold mine in the Dazhuohan mine, producing 500,000 metric tones concentrate a year. They are currently traded on the Shanghai Stock Exchange as "Company 600489", and are listed on Forbes "Asian Fab 50" list. As they are generally considered China's most powerful gold corporation, they often do business with many foreign companies and entities.
Document 9: Consolidated Zinc: Consolidated Zinc was an Australian mining company from 1905 to 1962. The company's initial operations focused on extracting zinc from mine tailings of the Broken Hill Ore Deposit at Broken Hill, New South Wales, Australia. The company was founded in Melbourne on 9 September 1905 as the Zinc Corporation Limited, to exploit residual zinc concentrations with an estimated value of $12 million in the 6 million tons of mine tailings deposited from mining activities over the previous 20 years. Key figures involved in the effort included William Baillieu and William Sydney Robinson. Also involved was future U.S. president Herbert Hoover, who inspected the tailing dumps as a mining engineer in the group's investigations prior to formation of the company.
Document 10: Reliance Group: Reliance Anil Dhirubhai Ambani Group (Anil Dhirubhai Ambani Ventures Limited) is an Indian conglomerate, headquartered in Navi Mumbai, India. The company, which was formed after Dhirubhai Ambani's business was divided up, is headed by his younger son Anil Ambani. It has a market capitalisation of () and net assets worth () . The Reliance Group operates in over 20,000 towns and 450,000 villages in India, and abroad.
Document 11: En+ Group: En+ Group is a Russian energy-related company controlled by Oleg Deripaska. En+ Group owns a controlling interest in United Company RUSAL, owns the largest independent Russian power producer EuroSibEnergo, and is a supplier of ferromolybdenum as well as significant coal assets and logistics business. It reported revenues of $15.3 billion in 2011.
Document 12: Hindustan Zinc Limited Ground: Hindustan Zinc Limited Ground is a cricket ground in Visakhapatnam, Andhra Pradesh. It is owned by Hindustan Zinc Limited and was established in 2002.
Document 13: 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.
Document 14: Reliance Industries: Reliance Industries Limited (RIL) is an Indian conglomerate holding company headquartered in Mumbai, Maharashtra, India. Reliance owns businesses across India engaged in energy, petrochemicals, textiles, natural resources, retail, and telecommunications. Reliance is the most profitable company in India, the largest publicly traded company in India by market capitalization, and the second largest company in India as measured by revenue after the government-controlled Indian Oil Corporation. The company is ranked 215th on the "Fortune Global 500" list of the world's biggest corporations as of 2016. It is ranked 8th among the Top 250 Global Energy Companies by Platts as of 2016. Reliance continues to be India’s largest exporter accounting for 8% of India’s total merchandise exports with a value of Rs 147,755 crore and access to markets in 108 countries.Reliance is responsible for almost 5% of India’s total revenues from customs and excise duty and is also the highest Income tax payer in the private sector in India.
Document 15: Glencore: Glencore plc (an acronym for Global Energy Commodity Resources) is an Anglo–Swiss multinational commodity trading and mining company with headquarters in Baar, Switzerland, and a registered office in Saint Helier, Jersey. The current company was created through a merger of Glencore with Xstrata on 2 May 2013. s of 2015 , it ranked tenth in the Fortune Global 500 list of the world's largest companies. It is the world's third-largest family business.
ground_truth: Anil Agarwal