Abstract
Recent research on the Revett Formation of the Coeur d'Alene Mining District of northern Idaho indicates that mappable stratigraphic subunits extensively influence the spatial distribution of ground control hazards associated with mining-induced seismicity and falls of ground. In particular, heightened levels of mining-induced seismicity are linked to certain hard subunits of vitreous quartzite. Overcore stress measurements have shown that at least portions of these hard subunits also contain anomalously high, rotated stress fields. Furthermore, first-motion studies show that some large seismic events are driven by stress fields aligned with these hard subunits. An improved understanding of the relationship between vitreous quartzite subunits, in situ stress, and various ground control problems should provide engineers with opportunities to anticipate the spatial distribution of ground control hazard potential in a rock mass.
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