Apr 13, 2009. /Lesprom Network/. Ainsworth Lumber Co. is investigating alternative uses for a 223-acre industrial site in Grand Rapids, Minnesota, that had previously served as an OSB mill, as Tower Timberjay News informed Lesprom Network. A victim of the slumping housing market, Ainsworth discontinued its Minnesota operations after shutting down mills at Cook and Bemidji in January. The mill at Grand Rapids was closed in August 2008. All three mills were acquired by Ainsworth in 2004 and manufactured oriented strand board. The mills employed a combined a workforce of about 460 and processed more than 900 thousand cords of timber annually — enough to provide employment for 40 to 50 full-time logging crews. Ainsworth is also actively promoting the sale of the site and has retained a firm to market the property to prospects around the world.