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Hazards and safety practices on search piles maintaining stockpiles of raw and processed materials are important parts of most mining operations some mines store material and search piles where it is recovered from draw off points or feeders located beneath the pile this video will illustrate the most common hazards at search piles and show how these hazards can be avoided to work safely around search piles there are three conditions that you must be especially aware of first the material feeding into the draw point will not support weight and will act like quicksand second the material around the edge of the draw hole is only marginally stable and third sometimes material bridges over the draw point causing a hidden void in the pile this model demonstrates how a cone-shaped zone or draw hole forms above a drop point of a search pile as material flows down through the feeder opening the material used in this model has been chosen for its contrasting color and has been layered to increase the visual effectiveness of the demonstrations when the feeder is activated note how quickly the material directly above the drop point flows to the feeder if a person or piece of equipment is above the feeder when it is activated they will be drawn into the flowing material this is why section 931 — of parts 56 and 57 of the regulations requires that unless platforms or safety lines are used persons shall not position themselves over draw holes if there is danger that material may be withdrawn or bridged the zone of flowing material is obviously dangerous but be aware that the area near the edge of the draw hole is also potentially hazardous as material is withdrawn through the feeder support for the edge of the draw hole is continually being removed this keeps the edge standing at a steep angle and on the verge of collapsing for this reason no one should walk near the edge of a DRA hole and equipment operators must avoid getting into a position where the weight of their equipment may unexpectedly collapse the edge of the cone another reason why search piles are potentially hazardous is the possibility of material bridging or arching over the drop point creating a void inside the pile this condition is extremely dangerous because the cavity cannot be detected from the surface many mining accidents have occurred when a dozen has driven over a hidden void and the weight of the equipment collapsed the bridge area burying the machine and the operator to better illustrate the danger of bridged material let's look at the model again here we see a bridged condition developing there are many conditions that can cause the material to bridge moisture and fines in the material may cause it to cake together making it less free-flowing material that has been undisturbed for a period of time will settle in and be more prone to bridging heavy equipment operating directly on the pile can pack the surface material and form a crust while material deeper in the pile stays looser...
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