Gold miner Petropavlovsk is putting in a sparkling performance today after the Russia-focused gold miner it forecast production would rise 18% in 2011 even on a very conservative estimate.Its gains are surpassed by two companies that reported yesterday though.Heritage Oil wins back some losses from yesterday after it reported a big find in Iraq, though unfortunately of gas rather than oil as had been hoped.Meanwhile, there are more gains for precision engineer Renishaw, which soared yesterday after it posted a sharp rise in half year pre-tax profit and upped its dividend following a surge in demand from Asia and metrology products.Turning back to today's updates, the snow may have kept shoppers away from the stores in the run up to Christmas but luckily it didn't prevent them from celebrating once the festivities got under way, judging by an update from pub group Mitchells & Butlers.The owner of All Bar One and O' Neills said it was unaffected by snow in the key part of the Christmas period as it posted strong sales growth with its food operations continuing to lead the way.Sticking with beverage-related stocks, soft drinks firm Britvic said total first quarter revenue increased 20% from the same period a year earlier and it remains confident about the outcome for the full year.Gold miner Centamin Egypt is lower as the continuing turmoil in Egypt unnerves investors.FTSE 250 - RisersHeritage Oil (HOIL) 337.50p +8.87%Renishaw (RSW) 1,706.00p +6.76%Petropavlovsk (POG) 1,095.00p +6.10%Mitchells & Butlers (MAB) 358.80p +4.67%SThree (STHR) 387.10p +4.37%Rightmove (RMV) 836.00p +3.92%Mondi (MNDI) 524.00p +3.87%Britvic (BVIC) 465.30p +3.68%Victrex (VCT) 1,463.00p +3.61%Greene King (GNK) 463.40p +3.51%FTSE 250 - FallersHansen Transmissions International NV (DI) (HSN) 54.25p -4.82%BTG (BGC) 240.90p -4.25%Centamin Egypt Ltd. (CEY) 131.50p -3.80%CPP Group (CPP) 305.00p -3.63%Travis Perkins (TPK) 1,038.00p -2.99%Restaurant Group (RTN) 296.00p -2.89%Daejan Holdings (DJAN) 2,731.00p -2.88%WH Smith (SMWH) 468.90p -2.78%Redrow (RDW) 125.00p -2.72%Taylor Wimpey (TW.) 36.03p -2.60%