Oct 12, 2007. /Lesprom Network/. Ainsworth Lumber Co. Ltd. announced on October 11, 2007 that it will curtail operations at its oriented strand board (OSB) mills in Cook, Minnesota and Bemidji, Minnesota due to log supply shortages, high production costs and a decline in OSB orders. The Cook mill's closure takes effect immediately and the Bemidji mill's closure is planned to take effect October 19. Production is expected to resume at Cook on October 22 and at Bemidji on October 29. Log deliveries will continue to be accepted during these closures. Ainsworth is a leading Canadian forest products company with a 50-year reputation for quality products and unsurpassed customer service. With Canadian operations in British Columbia, Alberta and Ontario and United States operations in Minnesota. In Canada Ainsworth has long term timber tenure and supply agreements that provide up to 85% of its fibre requirements.