Mining giant BHP has made an all-share offer for fellow major Anglo American. If completed, the deal would be the biggest one in the mining world in years. Anglo American described the offer as “unsolicited, non-binding and highly conditional,” according to the Financial Times, and added that there was “no certainty that any offer will be made nor as to the terms on which any such offer might be made”. If Anglo agrees to BHP’s offer, the deal would also consolidate the global copper market in one fell swoop at a time…