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HOMiE ST AK.E r <br />Certified Mail 7196 9008 91119704 4374 <br />Return Receipt Requested <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />Attention: Mineral Division <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />IA'N 2 3 2015 <br />i'41!dSIQW OF RECL 1MAT10N <br />MINING AND SAFM <br />RE: HOMESTAKE PITCH RECLAMATION PROJECT ,/ <br />QK4 ANNUAL GEOTECHNICAL REPORT (M- 1977 -004 <br />Dear Division; <br />January 16, 2015 <br />Xco <br />Please find attached the 2014 Geotechnical Report for the waste rock management areas at the Homestake <br />Pitch Reclamation Project. The history of the rock dumps has been provided in previous annual reports <br />and is not repeated in this discussion. The rock dumps were inspected monthly in 2014, except when <br />winter conditions prohibited access, in accordance with the recommended monitoring program. A site <br />location map and rock dump piezometer map are provided as Figures 1 and 2, respectively. Detailed <br />analysis and presentation of the 2014 data from all piezometers are provided in the following pages. <br />The inspections conducted in 2014 indicate stable conditions for the Indian and Tie Camp Waste Rock <br />Dumps. Reclamation repairs done in 2012 had alleviated drainage and erosion issues and only reseeding <br />was required in 2014. We will continue close inspections of the rock dumps in 2015. <br />Historically, the water levels in rock dump piezometers show little fluctuation in the winter months with <br />a temporary rise in response to the spring snow melt. They usually return to normal levels in mid to late <br />summer. Two of the piezometers in the Indian Rock Dump were replaced in 2011 after several years of <br />issues associated with corrosion and silt buildup in the well casing making it difficult to get an accurate <br />reading of the phreatic surface in the rock dump. All of the piezometers are now functioning as required <br />to provide accurate water level information. The 2014 monthly water level measurements are provided <br />on Table 1 of the attached report. The piezometer readings in 2014 were indicative of the heavier snow <br />pack the past two years and heavier summer precipitation. The water level readings in 2014 are plotted as <br />Figure 3 and a graph with piezometer water levels since 1996 is provided as Figure 4. The Y -axis on these <br />plots is labeled as depth to water from the ground surface. <br />Please feel free to contact me in the Salt Lake City Utah office (801) 990- 3746 or via cell phone at (801) <br />244 -3547, if you have any questions. <br />Sincerely, <br />G� <br />Bill Ferdinand <br />Director of Environment <br />cc: Dale Davis - Homestake Mining Company - Sargents <br />Phillip DeDycker - ARCADIS -US, Inc. <br />Homestake Mining Company of California •3 460 West 50 North, Suite 500, <br />Salt Lake City, Utah 84101 <br />Tele: (801) 990 -3747 •8 Mobile: (775) 777 -4798 <br />