More on Barrick Gold's (ABX) Q1 results: ABX's 18% Y/Y drop in profit is attributed to lower gold and copper prices and reduced volumes sold. But ABX reaffirms 2013 gold production guidance of 7M-7.4M oz. at total cash costs of $610-$660/oz. Full year all-in sustaining cost guidance reduced to $950-$1,050/oz. from $1,000-$1,100/oz. previous guidance. Shares +2.9% premarket.