LED lighting group Dialight was a rare high riser after seeing revenues climb 18.2 per cent and operating profits rise 21 per cent in the half year ended June 30th. ??In contrast, mining stocks were firmly lower, in line with their FTSE 100 counterparts, with Aquarius Platinum among the fallers after it said that the likelihood of industrial action over the South African winter is high. "Aquarius is by no means immune to this threat, and intermittent unlawful industrial action has occurred at one of Kroondal's four shafts in July." ??Sector peer African Barrick Gold also fell after proposing to buy up the outstanding share capital of Aviva Mining (Kenya), its first expansion outside Tanzania. ??Transport firm Stagecoach fell despite completing its acquisition of Coach America, a bankrupt operator of bus and coach services in the US. FTSE 250 - RisersDialight (DIA) 1,061.00p +6.42%Computacenter (CCC) 345.00p +2.59%Ted Baker (TED) 897.50p +1.99%Big Yellow Group (BYG) 300.20p +1.76%NMC Health (NMC) 199.90p +1.63%KCOM Group (KCOM) 74.80p +0.94%Perform Group (PER) 366.10p +0.85%CSR (CSR) 300.80p +0.60%Dechra Pharmaceuticals (DPH) 487.30p +0.60%Daejan Holdings (DJAN) 2,841.00p +0.14%FTSE 250 - FallersAfrican Barrick Gold (ABG) 319.00p -15.47%Aquarius Platinum Ltd. (AQP) 39.01p -8.15%Dixons Retail (DXNS) 15.33p -7.20%COLT Group SA (COLT) 112.40p -7.11%Morgan Crucible Co (MGCR) 252.90p -6.33%Taylor Wimpey (TW.) 43.86p -6.32%Yule Catto & Co (YULC) 137.10p -6.29%Afren (AFR) 121.40p -5.67%Melrose (MRO) 201.70p -5.66%Phoenix Group Holdings (DI) (PHNX) 462.80p -5.65%NR