As on the top tier, mining stocks moved higher as a weaker dollar prompted a jump in gold and silver prices.Recruitment firm Hays has made a "good start" to the new financial year with like-for-like (LFL) net fees up 9% in the first quarter. Fees from temporary positions increased by 7% on a LFL basis in the three months to 30 September, while permanent fees rose 12%.Polymer products group Victrex said it made a "strong finish" in the 12 months to 30 September, with growth momentum continuing as it started the new financial year.Clothing retailer N Brown tumbled after it lowered its guidance for full-year profits after the second half started weakly due to mild weather. The board now expects pre-tax profits of between £88m-£92m, before expected reorganisation costs of around £5m.Cobham and Rightmove also dropped after going ex-dividend.FTSE 250 - RisersKazakhmys (KAZ) 251.10p +3.72%Hays (HAS) 124.10p +3.42%Hikma Pharmaceuticals (HIK) 1,850.00p +2.89%African Barrick Gold (ABG) 206.20p +2.84%BTG (BTG) 733.00p +2.73%Polymetal International (POLY) 480.50p +2.08%Michael Page International (MPI) 424.10p +1.97%Petra Diamonds Ltd.(DI) (PDL) 187.70p +1.96%Wood Group (John) (WG.) 690.50p +1.77%Vedanta Resources (VED) 921.00p +1.71%FTSE 250 - FallersBrown (N.) Group (BWNG) 303.00p -12.98%BlackRock World Mining Trust (BRWM) 374.50p -9.63%Bodycote (BOY) 595.50p -4.64%Oxford Instruments (OXIG) 966.50p -4.50%Zoopla Property Group (WI) (ZPLA) 211.90p -4.12%Premier Oil (PMO) 287.10p -4.08%Just Retirement Group (JRG) 121.90p -3.64%Nostrum Oil & Gas (NOG) 720.00p -3.49%Keller Group (KLR) 795.50p -3.34%EnQuest (ENQ) 89.70p -3.03%