2014-01-30_REPORT - M1973021 - Laserfiche WebLink

Home Browse Search

Average rock strength estimated using the RMR values indicate rock of very poor to fair quality at higher elevations and rock of poor to fair strength at lower elevations. Detailed RMR bench data are included in Appendix A. Scanline descriptions are presented in right hand rule below. 3.3.1 Bench 7550 The Bench 7550 scanline is approximately 200 feet long. The trend of the scanline is approximately 015 (north 15 degrees east). The bench is broken into two distinct sections at Station (Sta.) 1 +20. The 7550 highwall has been reclaimed, and thus is unmappable. • Sta. 0+00 to Sta. 1 +20 — Reclamation includes the placement of topsoil over waste rock. • Sta. 1 +20 to the end at Sta. 2 +00 — Reclamation includes the placement of waste rock. No topsoil is present. A photo documentary of Bench 7550 is presented in Figure 5. 3.3.2 Bench 7470 The Bench 7470 scanline is approximately 230 feet long and divided into three distinct sections. Sta. 0 +00 to 0 +80 consisted of primarily of granitic rock with localized gnessic pockets. Rocks observed within the highwall typically exhibited high compressive strength (estimated) and poor quality RQD. The trend of the highwall was 015 (north 15 degrees east). Two primary joint sets were evident. The first set exhibited a strike ranging from 340 degrees to 0 degrees with dips ranging from 45 to 65 degrees. The spacing between of these joints varied, but was typically moderate to wide. The persistence of the joints was also widely variable, but ranged from low to medium. Apertures of the joints were tight to open with slightly rough to rough surfaces and were slightly weathered. The second primary joint set exhibited a strike ranging from 30 degrees to 210 degrees with dips ranging from 80 degrees to 90 degrees. This joint set had similar properties to primary joint set 1— wide to moderately spaced joints, low to medium persistence, tight to open joint apertures, and slightly rough to rough rock surfaces. Two secondary joint sets were present within the 7470 highwall from Sta. 0 +00 to 0 +80. The first set exhibited a strike ranging from 155 degrees to 170 degrees with dips ranging from 45 to 65 degrees. The spacing between of these joints varied, but was moderate to close. The persistence of the joints was also widely variable but was typically low. Apertures of the joints were moderately open to tight with slightly rough to rough faces and were slightly weathered. The second set exhibited a strike ranging from 125 degrees to 130 degrees with dips of approximately 35 degrees. The spacing between of these joints was variable, but GEI Consultants, Inc. 8 January 2014 2013 Morrison Quarry Annual Report