Under-fire bank Standard Chartered was a high riser as it continues to rebound from its 16 per cent drop on Tuesday on the back of alleged dealings with the Iranian government. Gold miner Randgold Resources jumped after seeing profits surge in the first half of 2012 on the back of a record performance from its flagship Loulo-Gounkoto complex in Mali. Mining peers Glencore, Antofagasta and Xstrata were also higher on hopes that additional stimulus in China will boost the demand for commodities. Heading the other way was engineering and consultancy group AMEC despite saying it is on track for double-digit underlying revenue growth this year as sales jumped by over a third in the first half. The firm did not that its EBITDA margin slipped in the first half, and while it is expected to improve in the second half, it will be lower than the previous year. Struggling insurance giant Aviva edged lower after reporting a 10% fall in half-year operating profits as foreign exchange fluctuations and restructuring costs hit the bottom line.FTSE 100 - RisersStandard Chartered (STAN) 1,364.00p +3.69%Randgold Resources Ltd. (RRS) 6,300.00p +1.78%ITV (ITV) 82.70p +1.78%Aggreko (AGK) 2,252.00p +1.17%Imperial Tobacco Group (IMT) 2,520.00p +1.08%Glencore International (GLEN) 341.10p +0.95%British Sky Broadcasting Group (BSY) 750.00p +0.94%Unilever (ULVR) 2,297.00p +0.83%Tesco (TSCO) 329.40p +0.72%Sage Group (SGE) 298.60p +0.71%FTSE 100 - FallersAmec (AMEC) 1,082.00p -6.64%Evraz (EVR) 270.70p -3.32%Royal Bank of Scotland Group (RBS) 223.20p -2.49%BT Group (BT.A) 216.70p -2.26%Kazakhmys (KAZ) 741.50p -2.05%Capita (CPI) 726.50p -1.69%Pearson (PSON) 1,229.00p -1.52%Aviva (AV.) 313.40p -1.51%Smiths Group (SMIN) 1,059.00p -1.49%Weir Group (WEIR) 1,702.00p -1.28%NR