BHP has walked away from another attempt to take over rival miner Anglo American after it was again rebuffed, failing in a last-minute effort to disrupt the planned merger with Canadian mining business Teck Resources.The Australian mining company reportedly became interested in making another offer for FTSE 100-listed Anglo last week, more than a year after abandoning a £39bn attempt to buy the business.The latest failed overture comes as Anglo and Teck shareholders prepare to vote on their $53bn (£39bn) me ...