Laserfiche WebLink
Stations 2+20 to 4+00 consisted of massive granitic gneiss with planar jointing as <br />above. This was considered a new section because the joint and foliation orientations <br />changed and the foliation dip steepened. The foliation strike ranges from 115 to 125 <br />degrees and dips range from 20 to 30 degrees southwest, parallel or slightly into the <br />highwall. Foliation average spacing was 20 inches and apertures were smooth to <br />slightly rough and generally closed. The primary joint set strike ranges from 320 to <br />330 degrees and generally dips from 60 to 80 degrees northeast. The secondary joint <br />set exhibits a strike of 65 to 75 degrees with dips of 75 to 85 degrees southeast. The <br />average joint spacing for joint set 1 was 36 inches and the average joint spacing for <br />joint set 2 was 18 inches. Both joint sets exhibited moderately open to closed, slightly <br />rough faces. <br />Figures 4 and 5 are a photo documentary of the features observed in Bench 6880. <br />The Bench 6820 scanline was approximately 550 feet long and was separated into 3 discrete <br />sections. The approximate orientation of the highwall observed for the scanline is 70 degrees <br />(north 70 degrees east). The highwall turns at 250 feet to an orientation of 340 degrees (north <br />20 degrees west) and continues north for approximately 300 feet. The material in the highwall <br />from station 0+00 to 2+50 is material that is in the process of being removed, the final <br />highwall for this elevation will match the north-south orientation of the previous highwalls and <br />will be further to the west. <br /> • Stations 0+00 through 0+30 consisted of weathered granitic gneiss. The strike of the <br />• foliation varies due to the wavy nature of the jointing and ranges from 280 to 290 <br />• degrees. Foliation dips range from 40 to 50 degrees northeast. The average spacing of <br /> the foliation was approximately 6 inches and the foliation displays smooth to slightly <br /> rough apertures that are generally closed. The primary joint set strike ranges from 100 <br />• to 110 degrees and generally dips from 80 to 90 degrees southwest. The secondary <br />• joint set strike ranges from 75 to 85 degrees and generally dips from 50 to 60 degrees <br /> southeast. Joint set 1 average spacing was 6 inches and joint set 2 average spacing was <br /> 32 inches. Joint set 1 exhibited closed, rough wavy faces while joint set 2 was <br />• generally closed with slightly rough faces. <br /> A light colored band was observed within the foliation from approximately station <br /> 0+00 to 1+65. This band was observed to be a more felsic zone within the surrounding <br />• gneiss. As this band is part of the foliation, it is not anticipated to increase or decrease <br /> the stability of the slope. <br />Stations 0+30 through 1+65 consisted of weathered granitic gneiss with minor biotite <br />schist. Foliation and joint orientations were indistinct due to the inconsistent joint <br />pattern combined with the amount of slough material covering the highwall. Joint <br />spacing was approximately 1 inch to 8 inches and joints appeared to be rough with low <br />persistence. The rock displays moderate iron staining and is assumed to be <br />disintegrated under the sloughed material due to weathering. The majority of the <br />sloughed material is present due to recent blasting for bench development. Blocks <br />observed in this area were generally less than 10 inches diameter due to the <br />disintegrated nature of the rock. Raveling from this zone is anticipated to cause only <br />local operational delays. <br />-5- <br />Morrison Quarry Annual Report 2008 February 2009 <br />F:\39 t 9_038\Annual_Report_2008\Geotech_Report_2008\Annual_Report_2008_Geotech.doc