Footsie has been dragged down by the weak mining sector, which makes up five of the top 10 worst performers. Xstrata is the biggest faller in the mining sector. It has signed a new agreement with the unions at its Sudbury mine in Canada and plans to recommence copper mining at the Fraser Mine this month. Copper miner Antofagasta produced 442,500 tonnes of the red metal in 2009, down on 2008 levels and below its target of 447,000.Standard Life is the best performer following the release of a trading statement that shows a 'significant increase' in flows and sales in the fourth quarter. Life and pensions net inflows more than tripled to £1.3bn from £0.4bn a year earlier. Life and pensions sales of £4.2bn were a sizeable improvement on both the prior year (£3.2bn) and the third quarter (£3.0bn).FTSE 100 - RisersStandard Life (SL.) 204.50p +3.44%WPP Group (WPP) 597.50p +2.14%Prudential (PRU) 605.00p +2.02%Autonomy Corporation (AU.) 1,598.00p +1.85%Barclays (BARC) 294.50p +1.67%Inmarsat (ISAT) 718.50p +1.63%Thomas Cook Group (TCG) 238.30p +1.45%London Stock Exchange Group (LSE) 656.50p +1.16%Imperial Tobacco Group (IMT) 2,061.00p +1.13%Lloyds Banking Group (LLOY) 54.80p +1.01%FTSE 100 - FallersAstraZeneca (AZN) 2,829.00p -3.48%Xstrata (XTA) 1,061.50p -3.15%Lonmin (LMI) 1,878.00p -3.00%Antofagasta (ANTO) 902.00p -2.96%Royal Bank of Scotland Group (RBS) 35.09p -2.93%BT Group (BT.A) 133.10p -2.49%Schroders NV (SDRC) 976.50p -2.45%Fresnillo (FRES) 707.00p -2.42%Eurasian Natural Resources (ENRC) 953.50p -2.41%TUI Travel (TT.) 262.70p -2.34%