 The board of Cornerstone Capital Resources Inc on Tuesday rejected BHP-backed SolGold Plcs takeover offer for the second time, saying it undervalued the Canadian copper and gold miner. For the second time, the Board is unanimous that SolGolds proposal substantially undervalues Cornerstone, Chairman Greg Chamandy, who has a 10 stake in the company, said in a statement. About 65 of Cornerstone shareholders have said they will not support SolGolds second offer. 