![]() ![]() Current controls address this problem through perimeter blasting, but these controls lack precision. Scaling, excessive overbreak, and damage to supported ground all pose a risk of disabling injuries and fatalities to miners after blasting is completed.Įngineers rely on good design practices to limit damage to areas surrounding the blast zone. Poor blast design can lead to loose or damaged rocks in the roof and at the ribs of drifts when the force of a blast extends beyond the target area. ![]() Particularly in underground metal/nonmetal mines, controlled blasting is used to create entries, commonly referred to as drifts. DRIFT was developed by the National Institute for Occupational Safety and Health (NIOSH) Mining Program to help reduce the risk of ground falls, which remain a serious threat to the safety of miners. Mines can now reduce the risk of post-blast ground falls with the DRIFT software, which helps engineers to create more effective blast designs. Typical spacing grid without perimeter control. Drilling of a drift, with red paint showing a ![]()
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