By Divya Rajagopal and Clara Denina (Reuters) -Barrick Mining appointed veteran executive Mark Hill as interim president and CEO on Monday following the sudden resignation of Mark Bristow, who led the Canadian miner for nearly seven years after its merger with Randgold Resources. On the same day, rival Newmont said CEO Tom Palmer will be replaced in January by insider Natascha Viljoen, who will become the first female CEO of the world's biggest gold mining company. The timing of the statements appeared t ...