2014-01-30_REPORT - M1973021 - Laserfiche WebLink

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2.0 2013 Mining Summary 2.1 North Quarry Mining in the North Quarry was completed in 2007, and as such, no mining activity occurred in the main trunk of the North Quarry in 2013. As a result of mine office site improvements, a small localized ridge was removed to improve site access and overall site aesthetics. The ridge removal resulted in material being processed through the onsite facilities and localized reclamation. The North Quarry is currently being used as a raw water storage reservoir for the Town of Morrison and Al. The pond has a water elevation of approximately 6339.56 feet above MSL. Figure 2 shows the current configuration of the North Quarry, including the reservoir and North Repository and Figure 21 shows the localized ridge removal area. 2.2 Central Quarry Mining activity was completed in the Central Quarry in 2001, and as such, no mining activity occurred in the Central Quarry in 2013. As a result, the Central Quarry experienced no major rock disturbances. Stripped materials including overburden, sillimanitic gneiss, and other undesirable material from the South Quarry were deposited as reclamation backfill in the Central Quarry during mining operations in 2013. Figure 3 shows the configuration of the Central Quarry. 2.3 South Quarry Mining operations continued in the South Quarry in 2013, with approximately 1.8 million tons of sellable material processed onsite. The 2013 mining operations did not result in an expansion of the South Quarry 2012 mining footprint. Mining occurred primarily on the west (east facing) and south (north facing) portions of the South Quarry. The general configuration of the South Quarry is shown in Figure 4. Mining in the South Quarry occurred between approximate elevation 6740 and 7550 above MSL. The mining resulted in several temporary mine highwall configurations on the order of approximately 15 to 75 feet with benches on the order of 20 to greater than 50 feet. Mining in 2013 resulted primarily in existing highwall expansion and minor highwall development. Total highwall height did not increase. Mining on Bench 6740 resulted in bench "daylighting" where portions of the south highwall present during the 2012 Geotechnical Addendum were removed completely. In addition, mine haul roads were modified to accommodate the revised highwall configuration, resulting in new or modified haul road highwalls. Approximate areas mined or disturbed in the South Quarry are shown in Figure 4. Figures 5 through 20 document the highwalls included in the scanline surveys conducted for the 2013 Geotechnical Addendum. GEI Consultants, Inc 3 January 2014 2013 Morrison Quarry Annual Report