The mining sector is out of favour Thursday as worries over global economic growth have caused continuing declines in commodity prices. Fresnillo, Antofagasta, Vedanta Resources, Eurasian Natural Resources Corp and Lonmin are among the worst performers.Meanwhile, the insurers are also on the decline, led by insurance giant Old Mutual, whose life assurance sales fell by 4% in the first quarter, primarily as a result of tough comparators in its Italian division.RSA Insurance is also unwanted despite hailing a strong start to the year with net written premiums of £2.1bn in the first quarter, up 8% on a year earlier. Sector peer Prudential is also lower.3i leads the risers in the FTSE 100. The private equity group said investment increased to £719 million in the year to 31 March, up from £386m in 2010.Utility stocks Centrica and Scottish & Southern Energy are also in demand.---BCFTSE 100 - Risers3i Group (III) 293.00p +7.84%Centrica (CNA) 318.00p +2.02%Tesco (TSCO) 417.60p +1.36%GlaxoSmithKline (GSK) 1,326.00p +1.26%Royal Bank of Scotland Group (RBS) 42.90p +1.13%AstraZeneca (AZN) 3,175.50p +1.05%Whitbread (WTB) 1,630.00p +0.99%Scottish & Southern Energy (SSE) 1,364.00p +0.96%Carnival (CCL) 2,612.00p +0.85%Associated British Foods (ABF) 1,061.00p +0.76%FTSE 100 - FallersFresnillo (FRES) 1,325.00p -6.09%ICAP (IAP) 488.70p -4.08%Antofagasta (ANTO) 1,145.00p -3.70%Vedanta Resources (VED) 2,086.00p -3.65%Old Mutual (OML) 130.50p -3.55%Man Group (EMG) 243.90p -3.48%Eurasian Natural Resources Corp. (ENRC) 833.00p -3.36%Lonmin (LMI) 1,508.00p -2.77%Weir Group (WEIR) 1,886.00p -2.48%Prudential (PRU) 747.00p -2.35%