Diversified miner BHP Group Ltd. (NYSE:BHP) has signed a $4.3-billion silver streaming agreement with Wheaton Precious Metals Corp. (NYSE:WPM) covering its share of output from the Antamina mine in Peru. Based on the upfront consideration, this is the most valuable precious-metals streaming transaction to date. “We are pleased to partner with Wheaton – a global leader in precious metals streaming. BHP’s investment in Antamina has delivered value to investors through strong copper production performance, ...