Specification Stone Products. Specification Stone Products operates in Alpena, Michigan. The Alpena quarry was purchased in 1987 from Straights Aggregates, which was owned by the Detroit and Mackinaw Railroad. They started the quarry in 1980. In 2009, the Alpena operations were purchased by the Levy Group of Companies.
Boxley produces aggregate that meets AASHTO (American Association of State Highway and Transportation Officials) specifications. Each stone quarry produces different gradations and sizes based on market demand and plant capacity. Our product data sheets listed below provide specific details on each product specification.