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NEWMONT <br /> Newmont Mining Corporation <br /> Cripple Creek&Victor Gold Mining Company <br /> 100N3"'St <br /> RECEIVEDVicctorr,°CO 180860 <br /> JAN 0 4 2010 www.newmont.com <br /> December 21, 2017 WAMOFUMMON <br /> SENT CERTIFIED RETURN RECEIPT REQUESTED <br /> 7017 1450 0000 9199 0294 <br /> Mr.Timothy Lazier,P.E. M-1980-244 - TR96 <br /> Environmental Protection Specialist <br /> Colorado Department of Natural Resources Complied! <br /> Division of Reclamation,Mining and Safety FIVE total Violations! <br /> Office of Mined Land Reclamation <br /> 1313 Sherman Street,Room 215 TC1. WHE <br /> Denver,Colorado 80203 <br /> Re: Permit No.M-1980-244;Cripple Creek&Victor Gold Mining Company: Cresson Proiect;— <br /> Amendment 11—TR96—WHEX Backfdl <br /> Dear Mr. Cazier: <br /> Newmont Mining Company's Cripple Creek and Victor Gold Mining Company (CC&V) hereby submits <br /> Technical Revision(TR) 96 proposing to increase the height of the backfill of the Wild Horse Extension <br /> (WHEX)pit. <br /> Background: <br /> CC&V is currently permitted to backfill a portion of the WHEX pit, specifically the southern and eastern <br /> sides,to 10,145 feet above mean sea level(AMSL). <br /> Backfill Design: <br /> Due to a business need for short haul options and expanded overburden storage, CC&V proposes <br /> increasing the height of the backfill in portions of the WHEX pit to approximate original contour(AOC). <br /> Figure 1 shows the proposed post mining topography and Figure 2 shows the proposed post reclamation <br /> topography. It is important to note that slight modifications were made to the AOC in order to direct any <br /> surface stormwater flows down into the pit and ensure flows were directed away from Grassy Valley. <br /> Figure 1 depicts how the backfill will be built in a way to achieve a 1.5%grade away from Grassy Valley <br /> while Figure 2 shows the flow of surface runoff depicted by directional flow arrows. <br /> This backfill is proposed to be constructed in similar fashion to previously permitted backfill at CC&V. <br /> Backfilling will be accomplished by truck placement of the overburden material in "lifts"that will vary in <br /> height depending on the logistics of truck hauling,the geographic locations relative to the mine areas,and <br /> overburden removal scheduling. Some areas of backfill will decrease compared to what is currently <br /> permitted, however, most areas will increase. The greatest increase is approximately 280 feet above <br /> previously permitted heights. <br /> For the Division's ease of review, CC&V has provided Figure 3,4 and 5 in Attachment 2 which provide a <br /> visual illustration of the Amendment 11 approved backfill compared to the proposed backfill increase in <br /> this TR. Note that the amount of backfilling and the timing of such backfilling that will occur in a <br />