Shares of India’s Vedanta slumped to a two-and-a-half-year low on Friday after analysts expressed concerns over an investment by the parent company of the conglomerate in African miner Anglo American. Vedanta said on Thursday its foreign unit Cairn India Holdings had paid $200-million to buy a stake in Anglo American from Volcan Investments, the miner’s parent company, as a part of its "cash management activities".