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• A secondary joint set is evident in this area and exhibits an average strike of <br />140 degrees with an average dip of 57 degrees northeast. <br />Small blocks may form in this area due to the orientation of the highwall and jointsets of <br />the rock. These blocks are anticipated to be limited in size, and should be retained on the <br />bench below the highwall. Due to the moderately to highly fractured nature of the rock, <br />raveling is to be expected in this area. Raveling from this zone should be retained on the <br />bench below the highwall and is anticipated to cause only local operational delays. <br />• Stations 1 +10 through 1 +75 consisted of moderately fractured biotitic gneiss. <br />The foliation strike in this area varies due to minor folding averages 350 <br />degrees with an average measured dip of 70 degrees southwest. The average <br />measured dip is not representative of the overall highwall and was measured at <br />a discrete location due to highwall configuration and safety concerns. The <br />average dip for the entire highwall is likely much lower. Foliation spacing <br />ranges approximately 4 inches to more than 2 feet, and foliation apertures were <br />tight and slightly rough to very rough. The primary joint set strike averages <br />125 degrees and with an average dip of 68 degrees northeast. A second primary <br />joint set strike averages 205 degrees and with an average dip of 85 degrees <br />southeast. The spacing of the primary joint sets varied widely, but averaged <br />approximately 18 inches. Joint apertures were tight to moderately open with <br />slightly rough to rough faces. <br />Small blocks may form in this area due to the orientation of the highwall and jointsets of <br />the rock. Discontinuities commonly dip out of the highwall indicating an increased chance <br />of raveling. These blocks are anticipated to be limited in size, and should be retained on <br />the bench below the highwall. Due to the moderately to highly fractured nature of the <br />rock, raveling is to be expected in this area. Raveling from this zone should be retained on <br />the bench below the highwall and is anticipated to cause only local operational delays. <br />• Stations 1 +75 through 3 +05 were unmappable due to overburden and rock <br />cover. The condition of the highwall is unknown in this section. <br />Due to the height of the highwall on bench 7250, special care should be taken to avoid <br />raveling from high on the highwall that could potentially extend 25 feet or more from the <br />highwall toe. <br />Figure 6 is a photo documentary of the features observed in Bench 7250. <br />Bench 6700 <br />The Bench 6700 scanline is approximately 1380 feet long and was separated into 5 discrete <br />sections. The approximate orientation of the highwall varies between is 30 degrees (north <br />30 degrees east) and 325 degrees (north 35 degrees west). This scanline replaces the <br />scanline conducted at this elevation for the 2010 Annual Report. <br />- 7 - <br />Morrison Quarry Annual Report 2011 <br />P \235I4 \133- 23514 - 12002\ Deliverables\Deliv -01- Annual Report \Annual_Report_20I l_Geotech.doc <br />January 2012 <br />