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Engineering Analytics,Inc. 1600 Specht Point Rd. Suite 209 Fort Collins,CO 80525 970.488.3111 www.EngAnalytics.com <br /> August 18, 2017 RECEIVED Project No. 2101.05.15 <br /> OCT 11 2017 <br /> Mr. Julio Madrid DMSION OF RECLAMATION <br /> Battle Mountain Resources, Inc. MINING AND SAFETY _.......% <br /> P.O. Box 310 --1,g)0 I./614-?‘‘ <br /> San Luis, CO 81152-0310 �'v�PQ�S aesy, �o to <br /> :. //8//7'?,*:• . • <br /> i 33319 <br /> RE: 2017 2°d Quarter and Annual Dam Safety Inspection Report ti ct. <br /> San Luis Tailings Dam / j O.?,,/ ,�` <br /> CDRMS Permit No. M-1988-112 %% ``ONAl. — <br /> Dear Mr. Madrid, <br /> At your request, Engineering Analytics, Inc. (EA) conducted the 2017 annual dam safety <br /> inspection for the San Luis Tailings Dam. The inspection was conducted on May 5 by Mark S. <br /> Abshire, P.E., in conformance with the Tailing Dam Safety Inspection and Reporting Program <br /> prepared by Miller Geotechnical Consultants, Inc. (MGC), dated March 12, 2013. <br /> EA's inspection included review of the following historical project documents: <br /> • San Luis Project Tailing Dam Detailed Inspection Report (MGC, February 2014) <br /> • 2015 Annual Inspection Report (MGC, June 10, 2015) <br /> • 2016 Annual Inspection Report (MGC, July 6, 2016), and <br /> • 2017 Annual Inspection Report (MGC, April 26, 2017). <br /> An overall site plan of the San Luis TSF is presented on Figure 1. Specific inspection results are <br /> detailed on the Tailing Dam Inspection Form(Attachment 1), and findings are presented on Figure <br /> 2. Photographs taken during the inspection are included as Attachment 2: <br /> • Photos 1 - 21 Overall TSF site photos <br /> • Photos 22—32 Photos of specific inspection findings. <br /> PREVIOUS FINDINGS <br /> The primary issues identified in the 2016 annual inspection included the need for improvements <br /> to the South Diversion Channel, including replacement of the drop structure. Major regrading was <br /> conducted in late 2016 to increase the capacity of the channel, and replacement of the drop <br /> structure is scheduled for the spring of 2018. Additional minor items identified in 2016 included <br /> erosional rilling at the right downstream groin, and regrading of the area around the underdrain <br /> outfall to reduce ponding of surface water in that area. <br /> San Luis TSF Q2&Annual Dam Engineering Analytics,Inc. <br /> Safety Inspection Report.docx <br />