Laserfiche WebLink
<br />' .August 1999 to August 2000, indicating stable slope conditions. Survey information is <br />' provided in Appendix A. <br />B. South End <br />' The overall slope appears stable. There are localized areas of instability on individual <br />benches due to "poor" rock mass conditions. Localized areas of instability were observed in <br />' temporary slopes and these conditions will continue to be monitored during further <br />development in this area. <br />Based on the conditions observed with the present exposures, the rock mass at the south end <br />' of the Central Quarry on Benches C and D is now classified as "competent". Rock mass <br />properties have significantly improved with depth, with higher strength parent rock, less <br />weathered and more massive than the rock mass above, which was composed of low strength <br />' rock material with weathered and slick joint surfaces. <br />Above Benches C and D, the rock mass is typically "poor" due to weathered schist interbeds <br />' having a slick and weak character that are frequent throughout the rock mass, and talc-like <br />alteration is prevalent in this portion of the quarry. <br />' C. West Side <br />The overall slope appears stable. Localized instabilities are infrequent and consist of <br />' relatively small loose blocks and wedges, generally less than 10 feet in length. These <br />instabilities are as expected for the highwall and only cause localized operational <br />inconveniences. <br />' The overall condition of the cock mass of Bench C and D is "competent". <br />' D. North End <br />The overall slope appears stable. Localized instabilities are infrequent and consist of <br />relatively small loose blocks and wedges, generally less than 10 feet in length. These <br />instabilities are as expected for the highwall and only cause localized operational <br />inconveniences. <br />' The overall condition of the rock mass of Bench C and D is "competent". <br />' 5.03 North Quarry <br />The highwalls and benches are aligned curvilinear bearing approximately 000° to 080° <br />' azimuth as the pit extends to the east. The rock type is primarily granite gneiss with mafic <br />and felsic intmsions (felsite dikes and pegmatites). <br />' The primary joint set coincides with foliation of the rock mass. In general, the foliation dips <br />in a west/southwest direction. Foliation orientation has local variations due to several sets of <br />localized anticline/syncline structural features in the rock mass. The primary joint set is <br />parallel to sub-parallel to the mining face on the western side, perpendicular to sub- <br />' perpendicular on the northern side dipping into the mining face. Dip angle is approximately <br />20°to 50°. This foliation joint set is shown in Table I. Spacing of joints in the primary joint <br />G.1PR01 ECTS120200 Aforrison Quarry~008L0004epon12000 geo¢chmwl addendum duc <br />