What can be considered as an example of flyrock?

Flyrock refers specifically to blasted material that is propelled away from the intended blast site during an explosive operation. In this context, the correct choice is indeed the ejected material that travels beyond the blast area. This phenomenon can pose significant safety risks to personnel and equipment located in or near the blast zone since flyrock can travel considerable distances depending on the type and amount of explosives used, as well as the geographical and environmental conditions.

Understanding flyrock is crucial in the context of blast safety, as it helps in implementing necessary precautions and establishing proper safety zones to protect workers and property. The other options do not adequately define flyrock as they pertain to situations where material remains within controlled areas or is deemed safe, thus not representing the risks associated with flyrock events.