Mining conglomerate Vedanta Ltd on Tuesday said a committee of directors formed by the company's board has approved raising up to Rs 3,400 crore through non-convertible debentures. The company will issue non-convertible debentures (NCDs) on a private placement basis in one or more tranhances."The duly authorised Committee of Directors at its meeting held today...considered and approved for raising, on a private placement basis, up to 3,40,000 nos secured, unrated, unlisted, redeemable, non-convertible debentures (NCDs) of face value Rs 1,00,000 each aggregating up to Rs 3,400 crore in one or more tranche(s)," the company said in a stock exchange filing.