MOSINEE, Wisconsin — About 200 employees at the Mosinee paper mill were told before their shifts this week that their jobs are at risk as Ahlstrom moves forward with a phased shutdown of key operations at the plant. Several employees, speaking on condition of anonymity, told Wausau Pilot late Wednesday that management told workers Paper Machine No. 2 will shut down June 30, with Paper Machine No. 3 and the pulp mill slated to close Sept. 30. …In the letter to suppliers, Ahlstrom said it plans to permanently close the pulp mill and idle the M2 and M3 paper machines as part of a restructuring of operations at the Mosinee facility. The company cited rising costs and limited automation at those operations as reasons for the decision. …Ahlstrom said Paper Machines No. 1 and No. 4 will continue operating at the Mosinee mill. The company also said it plans to invest in modern technologies at those remaining machines.