The broker's favourite blue-chip miners are BHP Billiton, up 15p at 732p, Xstrata, 18p higher at 1107p, Rio Tinto, up 22p at 1746p, and Vedanta Resources, 3p lighter at 500p. Canaccord Capital has also kept its buy rating on BHP, with a 750p target, because of the group's growing exposure to oil prices though the development of its Neptune field in the US.