J. Burgess Winter, vice president-minerals of BP Minerals America, parent company of Kennecott Utah Copper, has resigned and will become president and chief executive officer of Magma Copper Co., San Manuel, Ariz., the nation's third largest copper producer.

Aug. 25 was his last day at KUC, and he will be moving to his new post in late September. He succeeds Brian Wolfe, who died of a heart attack last April.Winter started with BP Minerals in 1983 as the vice president of operations and played a key role in the $400 million modernization program that is being completed at the copper pit. He also was heavily involved in 1986 labor negotiations that allowed for the re-opening of the copper operation and prefaced the decision to start the modernization project.

Winter said he appreciated the cooperation of the trade unions, the professionalism of the BP managers and the world class ore body at the copper pit during his stay in Utah.

Prior to joining BP Minerals, Winter was vice president and general manager of Inspiration Copper Co., Miami, Ariz., where he directed a $100 million modernization program.

Magma has 4,500 employees expected to produce 250,000 tons of copper this year at a new flash smelting system at San Manuel and expanded electrolytic refinery.

The Ireland native is a 1956 industrial chemistry graduate of the Belfast College of Technology.