A sprinkler system put out a fire that started at BJB Milling and Lumber Wednesday night. Crews were dispatched just before midnight to the mill near Seneca Road and Roosevelt Boulevard in Eugene. The fire started in a silo on the mill’s property, and fire officials said the sprinkler system prevented what could have been a huge blaze. The cause remains undetermined. Just two months ago, a fire devoured the 190,000-square-foot Whitsell mill in Saginaw in just half an hour. That blaze caused $10 million in damage. The Whitsell mill’s sprinkler system was ruled to be inadequate.