Aggregate Type: Base and Crusher Run Elk Mills Quarry produces a variety of granite aggregate products, including clean products, base products, rip rap and screenings. These products are used for road construction and developments, as well as in materials such as asphalt and concrete. Elk Mills Quarry has supplied many projects, including Cherry Island Landfill, the Commodore Barry Bridge and the Delaware State Route 1 and Interstate 95 Interchange.