The term refers in particular to rock that flies beyond the blast site, causing injuries to people and damage to property.
This is considered a significant issue in mining; between 1994 and 2005, 32 miners were injured by flyrock.
[1] Flyrock can vary in mass from marble-sized to car-sized.
[2] Accident data from the Mine Safety and Health Administration indicate that flyrock and lack of blast area security were the main causes of blasting-related injuries in surface mining.
[2] This incorporates public domain content from the U.S. Centers for Disease Control and Prevention.