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3.3.6 Bench 7120 <br />The Bench 7120 scanline is approximately 460 feet long and divided into three distinct <br />sections. <br />Sta. 0+00 to 1 +80 consisted of primarily of granitic and biotitic gneiss with minor, <br />localized pegmatite intrusions. Rocks observed within the highwall typically <br />exhibited medium high to high compressive strength (estimated) and very poor <br />quality RQD. The trend of the highwall was 020 (north 20 degrees east). Two <br />primary joint sets were evident. The first set exhibited a strike ranging from 350 to <br />10 degrees with dips ranging from 65 degrees to 80 degrees. The spacing between <br />of these joints varied, but was typically moderate. The persistence of the joints was <br />also widely variable, but ranged from low to medium. Apertures of the joints were <br />moderately open to tight with slightly rough to rough surfaces and were <br />moderately to slightly weathered. The second primary joint set exhibited a strike <br />ranging from 95 degrees to 290 degrees with dips ranging from 80 to 85 degrees. <br />This joint set had similar properties to primary joint set 1— very poor quality RQD, <br />wide to moderately spaced joints, low to medium persistence, moderately open to <br />tight joint apertures, and slightly rough to rough rock surfaces, and moderate to <br />slight weathering. In this section, rock mass was observed to be locally adversely <br />dipping with strikes ranging from 45 degrees to 210 degrees and dip of 30 to 35 <br />degrees. Foliations exhibited a strike ranging from 80 degrees to 350 degrees with <br />dips ranging from 5 degrees to 40 degrees. The spacing between of the foliation <br />varied, but was typically very close to wide. The persistence of the foliation was <br />also widely variable, but ranged from medium to high. Apertures of the foliation <br />were very moderately open to tight with slightly rough to rough surfaces and were <br />moderately to slightly weathered. In this section, rock mass was observed to be <br />locally adversely dipping with strikes ranging from 45 degrees to 210 degrees and <br />dip of 30 to 35 degrees. <br />Small blocks may form in this area due to the orientation of the highwall and joint sets of the <br />rock. In addition, due to the fractured nature of the rock and highwall weathering, raveling of <br />small to medium sized rocks can also be expected. These rocks resulting from block <br />formation and raveling are anticipated to be limited in size, and should be retained on the <br />bench below the highwall and only cause local operational delays. <br />Sta. 1 +80 to 3 +20 consisted of primarily of granitic and biotitic gneiss with <br />localized pegmatite intrusions. Rocks observed within the highwall typically <br />exhibited high to very high compressive strength (estimated) and moderate quality <br />RQD. The trend of the highwall was 355 (north 5 degrees west). Two primary joint <br />sets were evident. The first set exhibited a strike ranging from 320 degrees to 0 <br />degrees with dips ranging from 60 to 80 degrees. The spacing between of these <br />joints varied, but was typically moderate. The persistence of the joints was also <br />GEI Consultants, Inc. 16 January 2014 <br />2013 Morrison Quarry Annual Report <br />