Marling Jay (Mark) Ankeny, 75, a former director of the U.S. Bureau of Mines, died Sunday at Maryland University Hospital in Baltimore after a long illness.

Born in Nebraska, he started work in the coal mines around Johnstown. Pa. He graduated from Carnegie Tech and joined the Bureau of Mines as a coal mine inspector in Pittsburgh in 1934.

Mr. Ankeny became an authority on coal mine safety. He came to bureau headquarters in Washington in the late 1940s, and was appointed director of the bureau in 1956. He retired in 1964 and moved to Lusby, Md.

Mr. ankeny then became a consultant to major coal industries in this country and to the Ministry of Mines in New Zealand. He worked on mine disaster investigation and mine safety laws.

He had served as a lieutenant commander with the Navy in World War II and participated in the invasion of Normandy. He was a retired Naval Reserve officer.

Mr. Ankeny was a founder and past president of the Calvert County chapter of the National Association of Retired Federal Employees, and a member of the American Legion.

He is survived by his wife, Eleanor Mae, of the home in Lusby: two daughters, Eleanor Ann Murray of Kensington, and Jacqueline Joan Justice, of Lusby: two brothers, Donald M., of Jamestown, N.Y., and Thomas C., of Johnstown, Pa., eight grandchildren and a great-grandchild.