London's top stocks have made a positive start to the day after upbeat economic data from the Continent and a strong performance on Wall Street last night. Figures out this morning showed that Germany and France staged an unexpected return to economic growth in the second quarter of the year, raising hopes that other counties could follow suit, while US shares held onto gains as the Fed said that the economy may have seen the worse of the recession.Over here, miners are leading the rise, Lonmin, Rio Tinto, Kazakhmys, Xstrata, Fresnillo, Antofagasta and Vedanta Resources are all among the best performers.Insurer Prudential said its half-year results show continued "strong performance" in what still remains challenging market conditions. IFRS operating profit before tax from continuing operations increased 6% to £688m, driven by strong underlying operating performance in Asia, together with a one-off benefit from a regulatory change in Malaysia.Travel group Thomas Cook is the biggest faller despite posting a rise in revenues in the nine months to June 30. Revenue for the nine month period climbed by 10.7% from the same period the previous year to £5.9m, while losses from operations before exceptional items and swine flu reduced by 43.4% to £49.5m. Engineer Tomkins has cut its dividend as it swung to a half year loss and said its outlook remains uncertain. The group will pay an interim dividend of 3.5 cents per share compared with 11.02 cents in the same period last year and said prevailing end market conditions and its outlook led to the decision to cut the payout.Salamander Energy, the Asia focussed oil and gas exploration firm, said it is pleased to make a discovery that could lead to its second development in the Tarakan Basin in Indonesia.Interserve, the services, maintenance and building group, has been named preferred bidder for a £60m Thames Water Utilities contract covering the creation of new facilities and upgrade works at the Riverside Sludge Digestion plant. Mobile computer software firm Psion saw pre-tax losses widen in the first half of the year but said it expects a modest improvement in revenue in the second half.Hot Tuna, the surf-oriented fashion label, has raised more than £1.1m through a placing to increase its product offering and expand into new markets.FTSE 100 - RisersPetrofac Ltd (PFC) 888.00p +6.28%Royal Bank of Scotland Group (RBS) 47.23p +4.61%Lonmin (LMI) 1,468.00p +3.67%Kazakhmys (KAZ) 885.00p +3.63%Rio Tinto (RIO) 2,387.00p +3.24%Antofagasta (ANTO) 733.00p +2.95%BHP Billiton (BLT) 1,598.00p +2.77%FTSE 100 - FallersThomas Cook Group (TCG) 219.00p -4.78%Cadbury (CBRY) 574.00p -1.54%Inmarsat (ISAT) 532.50p -1.30%Marks & Spencer Group (MKS) 329.00p -1.05%BT Group (BT.A) 133.80p -0.89%Associated British Foods (ABF) 790.50p -0.88%Diageo (DGE) 928.00p -0.85%