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The Pennsylvania Bulletin defines 'Flyrock'' as any material ejected from the blast site due to the force of the explosion.  

Douglas Rudenko, VP for Vibra Tech Engineering was an expert witness for Gibraltar Rock. He said in testimony that pieces of rock, the size of a softball, has been known to fly out of a quarry site---up to 1000 feet. The homes across Church Road and Hoffmansville Road are well within 1000 feet. Perkiomenville Academy is about 1050 feet from the proposed quarry. School busses pass well within 1000 feet of the proposed quarry.

This picture is from a DEP slide presentation entitled, "The Adverse Effects of Blasting" (2/2/01). The piece of flyrock is in the lower right of the picture.

More than 1000 Feet?

Click the following link to the Department of Labor's Mine Safety and Health Administration web site.  The link is to an accident report from 1999 in Lancaster, PA, where a man was killed by flyrock  The man was hit with a baseball size piece of flyrock that came through his truck's front windshield. 

The accident occurred on a roadway that was approximately 180 feet away from the west quarry wall, and approximately 800 feet from the blast holes.  The report also mentions that "flyrock damaged a building approximately 1,500 feet west of this blast".