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â– NewFields <br /> Perspective.Vision, Solutions. <br /> TECHNICAL MEMORANDUM <br /> 9400 Station Street <br /> Suite 300 <br /> Lone Tree,CO 80124 <br /> T: 720.508.3300 <br /> F:720.508.3339 <br /> To: Cripple Creek and Victor Mining Company <br /> From: Jay Janney-Moore, P.E. <br /> Reviewed By: Nicholas T. Rocco, Ph.D, P.E. <br /> Project: Liner Integrity Engineering Support <br /> Project No: 475.0106.023 <br /> Subject: Leak Detection Recommendations <br /> Date: 27 March 2018 <br /> ....... ............ ...... ... <br /> NewFields Mining Design & Technical Services (NewFields) is pleased providing the following <br /> recommendations to Cripple Creek and Victor Gold Mining Company (CC&V) to determine the <br /> integrity of the geomembrane liner along the southern side of the Squaw Gulch Valley Leach <br /> Facility(VLF2) between the 9860-foot and 9650-foot benches. <br /> 1.0 BACKGROUND <br /> In December 2017, CC&V was loading ore on VLF2, along the southern side below the Mill <br /> between benches 9850' and 9650'. As the operators were advancing ore placement to the west <br /> along the edge of the pad, the ore slope unexpectedly shifted. At that moment, CC&V stopped <br /> work in this area, and shifted ore placement to another section of the pad. <br /> Soon after the movement occurred, CC&V requested a third party to inspect the integrity of the <br /> geomembrane liner. NewFields completed a site visit in January to observe the general area. At <br /> that time, NewFields recommended contracting a leak detection survey company to evaluate the <br /> geomembrane without need to expose the entire geomembrane surface. This method of <br /> evaluation has been successfully implemented previously at CC&V during the construction and <br /> certification of VLF2. Upon arrival to observe the area of concern, site conditions were not <br /> favorable to complete the survey. In order to get a successful leak detection survey, NewFields <br /> recommended CC&V to carefully remove as much of the ore as safely possible and expose a two <br /> foot wide isolation strip of geomembrane around the perimeter of concern. <br />