Hindustan Copper Ltd. is a central public sector undertaking under the ownership of Ministry of Mines, Government of India. HCL is the only vertically integrated government-owned-copper producer in India engaged in a wide spectrum of activities ranging from mining, beneficiation, smelting, refining and continuous cast rod manufacturer. HCL shares are listed at Mumbai, Delhi, Kolkata, Chennai, Ahmedabad exchanges. On 31 July 2015, the Government of India announced a 15% stake sale in Hindustan Copper Limited, reducing its stake from 89.5% to 74.5%. Origin Hindustan Copper Ltd. (HCL) was incorporated on 9 November 1967 to take over the plants and mines at Khetri, Kolihan in Rajasthan and Rakha Copper Project in Jharkhand from National Mineral Development Corporation. The central office is located at Kolkata which is the capital of the West Bengal state in India. In 1972 Indian Copper Corporation Limited, Private Sector Company, located at Ghatsila, Jharkhand with Smelter and Refinery was Nationalized and made part of HCL. Hindustan Copper Limited developed Malanjkhand Copper Project in Madhya Pradesh, the largest hard rock Open pit mine in the country which was dedicated to the nation on 12 November 1982. Further in 1990 a Continuous Cast Wire Rod plant of South Wire Technology was commissioned at Taloja in Maharashtra. Services HCL also produces gold silver, nickel sulphate, selenium, tellurium and fertiliser as by products. It is the first Indian Copper Producer to be accredited with ISO 9002 certification for Continuous Cast Rod Manufacturer at its Taloja Plant and for manufacture of cathode at its refineries both at Indian Copper Complex, Ghatsila, Jharkhand and Khetri Copper Complex, Khetri, Rajasthan Hindustan Copper Limited is engaged in mining and smelting of copper, having its production facilities and offices at various locations across the country. On 29 June 2012, CMD of the company said that construction of a smelting refinery at Visakhapatnam with an annual capacity of 600,000 tonne at a cost of ₹20 billion is under consideration. Units Khetri Copper Complex Located in the state of Rajasthan, from Delhi Capacity - 31,000 tpa copper cathode (the smelter and acid plant at KCC are under shutdown since late 2008 due to the slump in global commodity prices witnessed in 2008 and old machinery. Currently, only concentrator for production of copper concentrate is working in addition to associated mines.) By-products- sulphuric acid Mines - Khetri and Kolihan (producing 9,500 mt metal in concentrate / annum) Reserve Khetri