Port Ewen, N.Y.-Dyno Nobel is phasing out production at its explosives initiation systems plant here over a 12-month period. The plant serves quarry, construction, and mining industries. Citing diminishing customer demand and falling cost competitiveness, the company said the decision was first communicated to employees in September 2009. The phase-out will mean some 50 people will be laid off. The site will continue as a distribution, sales, and service support center, employing 14. The company noted that the manufacturing footprint of the site has been on the decline for several years, and that some 200 employees were laid off in 2003. Customers will continue to be supplied by other Dyno Nobel plants, including Simsbury, Conn.