Laserfiche WebLink
<br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />The primary join[ set is orientated along the foliation of the rock mass. The primary joint set <br />orientation varies along Bench A and B, corresponding with the varying orientation of the <br />foliation due to several sets of anticlinalfsynclinal structural features in the rock mass. In <br />general, the foliation dips into [he highwall in eidter a northwest or southwest direction. The <br />join[ se[ strike is parallel to sub-parallel to the mining face, at a dip angle of approximately <br />20~-50~. The two dominant joint sets related to foliation are shown in Table 2. Spacing of <br />joints in the primary joint set typically ranges from several inches to approximately 10 ft. <br />Join[ surfaces are typically tight and appear fresh to slightly weathered. Joints are typically <br />discontinuous. <br />Table 2. Dominant Joint Sets Along the West Side of the Central Quarry <br />Jotnt Set Strike Dip and Dip Direction Significance <br />Primary N35 W N30E 20W S l W None <br />(wlfoliation) N68E N82E 30SE 38SE None <br />Secondary N69W NISW 74SW 78NE Low <br /> NODE N15E 74SE 90 Low <br />Two dominant secondary joint sets are present, These joint sets are orthogonal to each other, <br />with strike orientation of one in a northwest direction, the other in a north/northeast direction. <br />These joints dip steeply to near vertical out of the mining face. The secondary joint sets are <br />shown in Table 2. Spacing of joints in the secondary joint set typically range from 1 to 10 <br />feet. Joint surfaces are typically tight and appear fresh to slightly weathered. Joints are both <br />continuous and discontinuous. These joints cause the final highwalls to be relatively smooth <br />and vertical. <br />Slope failures are limited to infrequent and relatively small block and wedge failures, <br />generally less than ]0 feet in length. These types of failures are as expected for the highwall <br />and only cause localized operational inconveniences. <br />The overall condition of the slope at Bench A and B is very favorable. <br />5.06 Floor of Central Quarry <br />Based on observed ground conditions and behavior of the exposed highwall benches, the rock <br />mass appears to be less weathered than the rock mass encountered at higher elevations. Also, <br />this rock mass appears to be less susceptible to wedge and slab failure than rock located <br />higher in the Central Quarry. In general, the rock mass in [he floor is more competent than it <br />is higher near the original ground surface. <br />5.07 North Quarry <br />The highwalls and benches are aligned curvilinear from approximately north [o east as the pit <br />extends to the east. The rock type is primarily granite gneiss with matic and felsic intrusions <br />(felsite dikes and pegmatites). Overall in the North Quarry, some areas have a "competent" <br />rock mass and some areas have a "poor" rock mass. <br />(. \F'KOI ECTS\10200 Aiorrison Quaff UlgFN!Hpni~iugOmarkup Juc <br />