Laserfiche WebLink
Newmont Mining Corporation <br /> Cripple Creek and Victor Gold Mining Company ""• <br /> 2016 Annual Arequa Gulch and Squaw Gulch Valley Leach Facilities Inspection ■ <br /> NewFields Project 475.0160.001 <br /> April 11,2017 <br /> the access road on the side of the VLF show signs of road maintenance performed by CC&V but <br /> nothing significant. <br /> NewFields analyzed the side slopes of the 2016 flyover AG-VLF surface, and found the ore <br /> slopes between the benches ranged between 1.3H: 1V, the designed angle of repose for the <br /> ore, and 2:1 around the perimeter of the VLF. The composite slope of the VLF, measured from <br /> the base of the facility to the top crest, varied between 1.8H:1V to 2.1H:1V. These slopes are <br /> flatter than the recommended design slopes of 1.6H: 1V and 2.OH: 1V as described in the letter <br /> from Dr. John Lupo with AMEC Earth and Environmental, dated February 5, 2010; regarding <br /> Phase 5 PSSA Ore Slopes. In the letter, Dr. Lupo amends the design slopes to those cited above <br /> based on a flatter Phase 5 PSSA pond bottom than was originally envisaged in the design <br /> submittal. <br /> Additionally, to show the development of the AG-VLF over the previous 5 years, NewFields <br /> created Figure 3. This figure allows the reader to compare ore surface configuration on an <br /> annual basis. Upon more detailed analysis the annual topographic record shown also reveals <br /> no significant surface deviation in non-active pad areas. The difference in topographic surfaces <br /> from year to year is basically of active ore stacking only. <br /> 1.3. Arequa Gulch Valley Leach Facility Underdrain Records <br /> CC&V provided NewFields with flow and water quality records for the AG-VLF underdrains, <br /> which were reviewed as part of the annual inspection program. The purpose of the underdrain <br /> data review was to identity any trends in the data that may be indicative of potential leakage <br /> from the AG-VLF containment system. For this inspection program, the review focused on the <br /> underdrain flow rates and measured WAD cyanide concentrations since these parameters <br /> would be elevated if leakage was occurring in the AG-VLF containment system. <br /> The data records reviewed include time histories from November 2015 through November <br /> 2016 for flow and water quality for the following underdrains: <br /> i 24 inch solid pipe <br /> y AG01 Spring pipe <br /> �= U D4A <br /> 5- UD4B <br /> Y UD5 <br /> UD North <br /> Z UD South <br /> Page 3 <br />