Silver miner Fresnillo is the best performer after being upgraded to "buy" by Citigroup. In contrast, the US bank had downgraded gold miner Randgold Resources to "hold" from "buy". Elsewhere in the sector Anglo American jumps on hopes that Xstrata will bow to institutional pressure and pay a premium for control of Anglo should it launch a bid.Cairn Energy is the worst FTSE 100 performer as the crude oil price hovers about the $61 mark having run into persistent selling pressure over the past few days.FTSE 100 - RisersFresnillo (FRES) 486.50p +9.94%Anglo American (AAL) 1,645.00p +5.21%Vedanta Resources (VED) 1,335.00p +5.12%Legal & General Group (LGEN) 52.03p +4.52%Xstrata (XTA) 611.80p +4.21%Rio Tinto (RIO) 1,970.50p +3.96%British Airways (BAY) 122.40p +3.73%Admiral Group (ADM) 897.00p +3.70%FTSE 100 - FallersCairn Energy (CNE) 2,082.00p -2.57%Hammerson (HMSO) 279.50p -1.93%ICAP (IAP) 423.00p -1.86%Smith & Nephew (SN.) 443.00p -1.39%Wolseley (WOS) 1,073.00p -1.29%Liberty International (LII) 381.00p -1.17%Autonomy Corporation (AU.) 1,347.00p -1.17%Sage Group (SGE) 171.60p -0.92%