Heavy rain caused increase of pore water pressure and mobilization of debris material. Valley dipping joint plane facilitating the downslope movement. Wedge failure occurred in the sheared/ jointed rockmass by the intersection of different joint sets.

UK_CHA_NH_ 002 (Kamera slide)
3 km downstream of Gaucher township.
Removal of overhangs, provision of benches, sausage wall towards hill and valley side,  shotcrete and soil nailing at crown.
Heavy precipitation, valley dipping joint planes, wedge failure in sheared and jointed quartzite.