STOCK CALL: BHP Billiton's (BHP.AU) expansion of Alumar refinery with JV partners looks set to be delivered on time, Goldman Sachs JBWere says. Analysts currently visiting the Brazilian operation. "The site visit to Alumar increased our confidence that the alumina expansion will be brought in on schedule and that our forecast for production in FY09 appears conservative," GSJBW says. However, says BHP plan for four-month ramp-up too aggressive and one year more likely. Maintains short-term Outperform and long-term Buy rating. Shares early down 7 cents at A$29.73.