During that same time period, sixty-eight miners were injured because they were within the "blast area" (the area in which rocks are expected to fly) during an explosion and thirty-two miners were injured by "fly rock
" (rock or debris flung outside a blast range), according to Centers for Disease Control and Prevention data.
The safety measures include the installation of a blasting mat to prevent fly rock
dispersal and suppress noise and dust; additional ground support such as bolting (strengthening of tunnel structure using bolts) and shotcreting (spraying of concrete to reinforce tunnel structure); and a full range of monitoring, ground surveillance and precautionary measures to protect workers, public, hil slope and property safety.
The Mine Safety and Health Administration (MSHA) issued a Serious Accident Alert for fly rock
* THE LASH: 8.30pm-9.30pm Newly formed and ready to fly rock
and soul revue who feature former 60ft Dolls drummer Carl Bevan and the vocal prowess of Erin McNamara.
The noise and "fly rock
" raining down have forced her daughter and dozens of neighbors to sell their houses and move away.
The investigation also confirms that the use of high specific charge cannot solve the problem, but may cause fly rock
"A fly rock
is absolutely not allowed under the regulations and should not be happening."
Murray and Howlett (1994) observed that hydraulic drop ball rock breakage technique produces cleaner rock fragmentation, very low levels of ground vibration, minimal fly rock
and dust and negligible toxic fumes.
These fragments are called "fly rock
," and the coal operators insist they're within their rights to use explosives so powerful they send chunks of flint and granite a quarter mile or more.
RTS's latest rockface profiling software, ROCKMATE is designed to reduce drilling and blasting costs, reduce the risk of fly rock
and reduce the environmental impact of blasting.
On March 22, a 42-year-old lead man with six years of mining experience was fatally injured at a Martin Marietta Materials plant when he was struck by fly rock
from blasting operations.