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1 11 11 1111 ?????????????1???••00 00 0000 0•00000 0 0 00000 000001111 <br />APPENDIX A: <br />South Quarry, Bench 6820 RMR data <br />Morrison Quarry <br />133-23514-08002 <br />Discontinuity Persistence <br />Set 1 Set 2 Set 3 Set 4 Set 5 Persistence is low due to <br />Very Low (6) <1m (<3.3 ft) Notes: fractured nature of rock. <br />Low (4) 1 - 3 m (3.3 - 9.9 ft) 3 - 9 ft 3 - 9 ft Persistence may be higher than <br />Medium (2) 3 - 10 m (9.9 - 33 ft) > 25 ft observed in the highwall due to <br />High (1) 10 - 20 m (33 - 66 ft) amount of slough material at <br />Very High 0 >20 m >66 ft) base of slope. <br />Discontinuity Separation (Aperture) <br />Set 1 Set 2 Set 3 Set 4 Set 5 <br />Very Tight Joints (6) <0.1 mm (< 0.003 in) <br />Tight Joints (5) 0.1 - 0.5 mm (0.003 - 0.02 in) > 0.02 in > 0.02 in > 0.02 in <br />Moderately Open Joints (4) 0.5 - 2.5 mm (0.02 - 0.1 in) <br />Open Joints (1) 2.5 - 10 mm (0.1 - 0.4 in) <br />Ve Wide Aperture 0 >10 mm > 0.4 in <br />Discontinuity Roughness <br />Set 1 Set 2 Set 3 Set 4 Set 5 Surfaces were difficult to <br />Very Rough Surfaces (6) VR Notes: examine due to slough material. <br />Rough Surfaces (5) R R Slough material surfaces were <br />Slightly Rough Surfaces (3) SR SR smooth to rough. <br />Smooth Surfaces (1) SM SM <br />Slickensided Surfaces 0 SL <br />Discontinuity Filling (Gouge) <br />Set 1 Set 2 Set 3 Set 4 Set 5 <br />Type clay, staining, shear, etc none (6) none (6) none (6) <br />Thickness <br />Estimated Compressive Strength <br />Seepage none, moist, dripping, etc none none none <br />Discontinuity Wall Face Weathering <br />Set 1 Set 2 Set 3 Set 4 Set 5 <br />Unweathered (6) UW <br />Slightly Weathered (5) SW <br />Moderately Weathered (3) MW <br />Highly Weathered (1) HW HW HW HW <br />Completely Weathered (0) CW <br />Residual Soil 0 RS <br />RMR Classification: Fair Rock (45 - 61) <br />Additional Notes: Granitic Gneiss. Stations 0+30 to 2+50 consisted of moderately to highly weathered material with close to wide joint <br />spacing producing slough material. Examined part of highwall was oriented east to west, however, at station 2+50 the <br />highwall turns to north-south orientation matching other highwall development. This section of the highwall was unable <br />to be examined due to active mining but the rock from a distance appeared fresh to slightly weathered with similar <br />orientations to Bench 6880 indicating good rock.