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In stoping, the ring stresses around a level, rise, or winze are so
increased by the influence of an approaching stope face that at some point
on the periphery the rock fails. The stress ring is broken, and the rock
of sides, back, and bottom released thereby expands suddenly and violently
into the excavation, causing a rock burst. This rock burst is identical in
type with those occurring in development. It is usually extremely local in
effect, though a heavy earth tremor is caused. Spalding
Source:
Dictionary of Mining, Mineral, and Related Terms
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