Shares in International Ferro Metals (IFL) roared ahead after the South African ferrochrome producer said the installation of its second furnace roof was completed on 2 September, on time and within budget."The furnace is expected to ramp up to full load by mid-October," IFL said. "The first furnace, which was switched in on the 30th of July 2011 is now operating at full load. Total annualised nameplate capacity for both furnaces is 265,000 tonnes."IFL said it will provide more details when it releases its full-year results next Monday.At 9.15am, shares in IFL were up by 10% at 19.25p.---RG