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NEWMONT <br /> Newmont Mining Corporation <br /> Cripple Creek and Victor Gold Mine <br /> PC Box 191, <br /> Victor CO 80813 <br /> wtiw✓,rewmont corn <br /> Memo <br /> • S ptember 28, 2016 <br /> Timothy Cazier, PE-DRMS <br /> • F- <br /> Paicle C bulski, EIT;Tom Byers, PE _ <br /> . - CC&V Geotechnical Department response to DRMS June 16, <br /> 2016—Inspection Report Corrective Action Adequacy Review <br /> The Cripple Creek and Victor Gold Mine (CC&V) provided the Colorado Division of Reclamation, Mining and <br /> Safety's(DRMS)with a slope stability review of slope stability for the ECOSA waste rock facility in light of <br /> seepage observed at the toe of the facility. This review was summarized in a memorandum dated July 20,2016. <br /> DRMS sent comments on the review in the form of an Inspection Report Corrective Action Adequacy Review <br /> dated August 16,2016. DRMS requested that the Geotechnical Department at CC&V address comments one(1) <br /> and three(3)from Inspection Report Corrective Action Adequacy Review DRMS review. In addition,DRMS <br /> requested a final report of the waste rock facility topography 30 days after the water line causing the seepage <br /> into the ECOSA dump was turned off. The water line was turned off on August 18, 2016. <br /> DRMS Comment 1(note that this comment references Figure 3 of the CC&V July 20 memorandum) <br /> LIDAR scan topogrophic surfaces. The fifth bullet on the second page references the LIDAR scan area on Figure 3 <br /> which appears to be on the order of 2,000 feet roughly north to south.The second to last sentence of this <br /> paragraph indicates the slopes analyzed for stability are centered on the seepage area(500 feet wide). It appears <br /> from Figure 3 that the width between the two observed seeps is on the order of 450 feet. The Division is <br /> uncertain as to how these different widths and areas are reflected in the LIDAR observations and the slope <br /> stability analyses. Based on pre-waste dump construction observations,the Division is aware the slope of the native <br /> surface underlying the dump increases towards the south end of the dump. Please confirm both the LIDAR scan <br /> and the dump slope profiles extend at least 150 feet to either side(and in between)the two observed seeps <br /> shown on Figure 3. <br /> CC&V Response to Comment 1 <br /> Figure 1 shows the LIDAR scan from June 2, 2016,with 150 foot offsets from the two main seeps. Note that the <br /> upper image in Figure 1 shows the full area of the bi-weekly LIDAR scans,and the lower image"zooms in"to the <br /> seepage area. <br />