Most such accidental deaths and injuries are blamed on unprofessional digging, use of substandard equipment, explosions inside coalmines, cave-in
COPIAPO Chile, August 23, 2010 (TAP) - Rescue workers on Monday reinforced a small drill hole to serve as an umbilical cord to 33 miners found alive 17 days after a cave-in
in Chile's far north and say it will take months to dig them out.
The workers were trapped at a depth of 540 metres when the powerful explosion, triggered by a build-up of methane gas, caused a massive cave-in
The greatest hazard and the most feared is a cave-in
Also, they must be braced against each other to prevent lateral movement in the event of a cave-in
(041) 411 Struck by object (02) 35 Pedestrian struck by vehicle/equipment (43) 19 Caught in or compressed by equipment/objects (03) 14 All other events 63 Total 542 Event (OIICS * code) (%) Excavation/trenching cave-in
In a trench that big, even a small cave-in
can involve more than 1,500 pounds--a weight you do not want plummeting in on top of you.
The pillars are stripped during the retreat portion of the process, resulting in what Zipf calls a "controlled cave-in
that trapped 33 miners deep underground in a small gold and copper mine in the far north of Chile.
Also in the northwest, 19 workers lost their lives in a cave-in
set off by an explosion in a mine in December.
Powershot Utility Construction Services of Nashua faces $64,700 in proposed fines from the Occupational Safety and Health Administration for alleged cave-in
hazards at a North Conway worksite