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April 10, 2014 <br />Cripple Creek & Victor Gold Mining <br />A Joint Venture • ANGLOGOLD ASHANTI (COLORADO) CORP., Manager <br />Operations Office <br />P.O. Box 191 • 100 North 3`d Street <br />Victor, Colorado 80860 <br />(719) 689 -2977 — Fax (719) 689 -3254 <br />SENT CERTIFIED, RETURN RECEIPT REQUESTED <br />7011- 0470 - 0000 - 4833 -9490 <br />Mr. Timothy Cazier, P.E. <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: <br />within SGVLF Weekly CQA Report (WE 3/22/2014) <br />Dear Mr. Cazier: <br />CC &V provides the following additional information regarding the above referenced questions <br />raised in your email, to Timm Comer, on April 04, 2014. <br />1) How is the backfill for underground workings evaluated for stability prior to concrete plug <br />installation? <br />Coarse shaft backfill is placed into the shaft opening using an excavator until it reaches a level where the <br />excavator can use the back of the bucket to compact the material. The stability of the shaft backfill is <br />based on the visual observation of the compacted material and its ability to support the pressure <br />applied by the bucket during compaction. <br />Technical Specification Section 02210, 3.02 Fill Placement addresses this procedure. <br />"CONTRACTOR shall compact and condition the final surface of the Coarse Shaft Backfill using a method <br />specification that results in a firm surface that will be approved by CERTIFYING ENGINEER." <br />Coarse shaft backfill conforms to the following specifications: <br />100% passing 12 -inch sieve <br />0 -15% passing No. 200 sieve R rE C E ;Q q <br />APR 14 2014 <br />Division of Reclamation, <br />Mining & Safety <br />