Oil India, a Maharatna PSU under the aegis of the Ministry of Petroleum; Natural Gas, is a premier integrated oil and gas company, possessing proven expertise in exploration, development, production, and transportation of crude oil and natural gas. Given the increasing importance of critical minerals, OIL has diversified into critical minerals, apart from its present portfolio of oil and gas. HCL, a Miniratna PSU under the aegis of the Ministry of Mines, is engaged in mining, production, processing, and marketing of copper and related products. HCL is currently focusing on mining and beneficiation of copper ore and the selling of copper concentrate.