BHP CEO Andrew Mackenzie

BHP CEO Andrew Mackenzie

Ian Waldie/Bloomberg

“He’s a hard guy to please,” Andrew Mackenzie, chief executive officer of BHP Billiton Ltd., said yesterday of Glencore CEO Ivan Glasenberg. Mackenzie, 56, took on the top role at the world’s biggest miner in May as the company and its peers grappled with falling revenue following a decade-long boom in demand for minerals.