Hindustan Zinc Ltd a Vedanta Group company is the market leader in zinc lead and sulphuric acid business. The company is India's only and the world's largest integrated producer of Zinc-Lead. They are also one of the leading Silver producers in the world. They are one of the lowest cost producers in the world and are well placed to serve the growing demand of Asian countries. The company's core business comprises of mining and smelting of zinc and lead along with captive power generation. The company is headquartered in Udaipur Rajasthan in India and has zinc-lead mines at Rampura Agucha Sindesar Khurd Rajpura Dariba Zawar and Kayad; primary smelter operations at Chanderiya Dariba and Debari all in the state of Rajasthan; and finished product facilities in the state of Uttarakhand.The company's current metal production capacity is 1064000 tonnes per annum (879000 tonnes of zinc and 185000 tonnes of lead). With reserves and resources of 404.4 million tonnes their exploration programme is integral to their growth and future expansions. The company also owns 474 MW of coal based thermal captive power plants in Rajasthan to support their metallurgical operations. Additionally it has green power capacity of 324 MW including 274 MW of wind power 16 MW of solar power and 35 MW of waste heat power.Hindustan Zinc Ltd was incorporated from the erstwhile Metal Corporation of India on January 10 1966 as a Public Sector Undertaking. In April 2002 Sterlite Opportunities and Ventures Ltd (SOVL) made an open offer for acquisition of shares of the company; consequent to the disinvestment of Government of India's (GOI) stake of 26% including management control to SOVL and acquired additional 20% of shares from public pursuant to the SEBI Regulations 1997. In August 2003 SOVL acquired additional shares to the extent of 18.92% of the paid up capital from GOI in exercise of 'call option' clause in the share holder's agreement between GOI and SOVL. With the above additional acquisition SOVL's stake in the company has gone up to 64.92%. Thus GOI's stake in the company now stands at 29.54%.Later on SOVL was merged with Sterlite Industries India Ltd in April 2011 which in turn merged with Sesa Goa Ltd to form Sesa Sterlite Limited in August 2013. Sesa Sterlite was renamed to Vedanta Limited in April 2015. Hindustan Zinc is now a direct subsidiary of Vedanta Limited.During the year 2002-03 the company completed 32000 tonnes of zinc debottlenecking at Debari Zinc Smelter and ViZag Zinc Smelter. Also they completed the debottlenecking of Rampura Agucha Mine from 1.37 million tonnes per annum to 2.30 million tonnes per annum. During the year 2003-04 the company completed the 35000 tonnes of zinc debottlenecking at Chanderiya Smelter Complex. During the year 2004-05 the company expanded the Rampura Agucha Mine from 2.30 million tonnes per annum to 3.75 million tonnes per annum. During the year 2005-06 the company commissioned 170000 tonnes per annum of Hydrometallurgical Zinc Smelter (Hydro I) at Chanderiya Smelter Complex. They commissioned 2 X 77 MW Captive Power Plant at Chanderiya Smelter Complex. Also they Commissioned 50000 tonnes per annum of Ausmelt Lead Smelter at Chanderiya Smelter Complex. During the year 2006-07 the company began production in Sindesar Khurd Mine with an initial production capacity of 0.3 million tonnes per annum. Also they Commissioned 38.4 MW of Wind Energy Farms at Gujarat.During the year 2007-08 the company commissioned 170000 tonnes per annum of Hydrometallurgical Zinc Smelter (Hydro II) in a benchmark time of 20 months at Chanderiya Smelter Complex. They commissioned 80 MW Captive Power Plant at Chanderiya Smelting Complex. They completed 5000 tonnes of zinc debottlenecking at Debari Zinc Smelter. Also they Commissioned 50.4 MW of Wind Energy Farms at Gujarat.During the year 2008-09 the company expanded the Rampura Agucha Mine from 3.75 million tonnes per annum to 5.00 million tonnes per annum making the total mining capacity of the Company to 7.40 million tonnes per annum. They completed the 88000 tonnes per annum zinc debottlenecking at Chanderiya Smelter Complex & Debari Zinc Smelter making the total metal production capacity to 754000 tonnes per annum. They commissioned 80 MW Captive Power Plant at Zawar Mines. Also they commissioned 34.4 MW Wind Energy Farms making the Company's total Wind Energy capacity to 123.2 MW.During the year 2009-10 the company expanded the Rampura Agucha Mine from 5.00 million tonnes per annum to 6.00 million tonnes per annum increasing the total mining capacity of the Company to 8.40 million tonnes per annum. Also they commissioned the 210000 tonnes per annum Hydrometallurgical Zinc Smelter at Rajpura Dariba increasing the Zinc & Lead metal production capacity to 964000 tonnes per annum (879000 tonnes of Zinc and 85000 tonnes of Lead).During the year 2010-11 the company commissioned the 1.50 mtpa concentrator at Sindesar Khurd. Also they added 160 MW (80X2) captive power generation capacity at Dariba. In January 2011 the company announced an addition of 150 MW in our existing wind power capacity. Of this around 135 MW has already been commissioned. The balance capacity is expected to be commissioned in Q4 FY 2012. During the year 2011-12 the company ramped-up Sindesar Khurd mine to 2.0 mtpa capacity. During the year the company commissioned the 100 ktpa lead smelter at Dariba increasing the lead production capacity to 185 ktpa. The company also commissioned new silver refinery increasing the silver refining capacity to 500 tpa. The company commissioned 102 MW expansion in wind power increasing total wind power generation capacity to around 274 MW. During the year the company commenced underground mine development work at Rampura Agucha mine and greenfield Kayar mine.During the year 2012-13 HZL produced development ore from Rampura Agucha underground mine and Kayad underground mine. It also announced the next phase of growth plan to increase capacity to 1.2 million tonnes per annum. During the year 2013-14 HZL commissioned new roaster at Dariba. The company also commissioned the first sewage treatment plant in Udaipur which will treat 20 million litres of sewage per day.During the year 2014-15 paste fill plant at Sindesar Khurd Mine and Rampura Agucha Mine were commissioned. During the year 2015-16 HZL's Sindesar Khurd Mine achieved 3 million MT per annum production capacity. During the year the Sindesar Khurd Mine beneficiation plant was debottlenecked to enhance its capacity from 2.0 million MT per annum to 2.75 million MT per annum.During the year 2016-17 Sindesar Khurd Mine ore production capacity was ramped up from 3.0 million MT to 3.7 million MT per annum. During the year the Chanderiya Hydrometallurgical Zinc Smelter capacity was enhanced from 4.2 lakh metric tonnes per annum to 4.3 lakh metric tonnes per annum. The Dariba Hydrometallurgical Zinc Smelter capacity was enhanced from 2.1 lakh metric tonnes per annum to 2.2 lakh metric tonnes per annum. During the year the company commissioned 1.5 million MT pa capacity mill at Sindesar Khurd in record 14 months. During the year HZL successfully commissioned 16 MW of captive solar farms.