Barrick Mining (NYSE: B)(TSX: ABX) has named Sebastiaan Bock to lead its international gold and copper business as the miner prepares to split its North American and overseas assets. Barrick expects output from the portfolio to increase by more than 20% over the next three years, putting Bock in charge of a key source of growth as the company seeks to sharpen management focus and address the valuation discount investors often apply to miners operating in higher-risk jurisdictions. Bock’s appointment comes as Barrick moves ahead with plans to separate its North American and international businesses following the resolution of a months-long dispute with Newmont (NYSE, ASX: NEM) over Nevada mining assets.