Fox Business Alert. The world's biggest asset manager is clinching an ironfisted deal with the world's biggest minor. Black Rockck, you know, typically known for being the world's largest wealth management company.It's got a huge ETF business, but its global infrastructure investment arm is really making some big moves. It's buying 49% of BHP's iron ore power network in Western Australia for $2 billion. The deal, at least from BHP's side of it, is aimed at freeing up capital at a time when the miner is spen ...