Fresnillo and Randgold Resources raced ahead after JP Morgan praised the ability of the mining companies to shield their cash-flows from the impact of weak gold and silver prices.BG Group's shares rallied after the British government unveiled plans to offer tax breaks for producers of shale gas. Barclays advanced after announcing it had gained regulatory approval to merge its African operations with Asba Group, the South African bank in which it owns a controlling stake.GlaxoSmithKline was among the worst performers as the pharmaceutical company continued to battle a Chinese bribery scandal.Tate & Lyle tumbled over concerns of the falling price of sugar due to sluggish demand from bulk consumers.Rio Tinto slumped after confirming it would cut some 78 contractors from the workforce at its Argyle diamond mine to lower its costs. FTSE 100 - RisersFresnillo (FRES) 1,063.00p +3.30%Randgold Resources Ltd. (RRS) 4,634.00p +2.41%G4S (GFS) 220.50p +1.66%BG Group (BG.) 1,223.00p +1.37%Barclays (BARC) 324.30p +1.34%Imperial Tobacco Group (IMT) 2,205.00p +1.15%ARM Holdings (ARM) 907.50p +1.11%Petrofac Ltd. (PFC) 1,306.00p +0.93%Tullow Oil (TLW) 1,117.00p +0.90%Schroders (SDR) 2,529.00p +0.84%FTSE 100 - FallersBurberry Group (BRBY) 1,505.00p -1.89%GlaxoSmithKline (GSK) 1,691.00p -1.40%Reed Elsevier (REL) 804.50p -1.23%Tate & Lyle (TATE) 848.50p -1.22%Rio Tinto (RIO) 2,885.50p -1.10%Resolution Ltd. (RSL) 310.10p -1.02%Compass Group (CPG) 887.50p -1.00%United Utilities Group (UU.) 720.50p -0.96%Aberdeen Asset Management (ADN) 409.40p -0.94%GKN (GKN) 339.00p -0.85%RD