Barrick Mining (NYSE: B) announced the resignation of President and CEO Mark Bristow today. After nearly seven years at the helm, the South African-born mining veteran departs without explanation, leaving investors to speculate on what prompted such an unexpected move.Effective immediately, Mark Hill, head of the company's Latin American and Asia-Pacific operations, has stepped in as interim CEO while the board begins a global search for a permanent replacement.“On behalf of the Board, I want to thank Mark ...