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<br />' 1.0 INTRODUCTION <br />1 Battle Mountain Gold Company (BMG) has completed the construction of the Tailings Disposal <br />Facilities at its San Luis Project, Costilla County, Colorado. The following report summarizes the <br />' construction activities during the construction period, the construction techniques used and minor <br />design changes made during construction. Also included in the report are as-built drawings in a <br />series numbered 14711-100 onwards and appendiceswith quality control (QC) and quality assurance <br />' (QA) documentation for the materials used during the construction of the facilities. <br />' The San Luis Project is located approximately five miles northeast of the town of San Luis on the <br />lower western slopes of the Sangre De Cristo Mountain Range. The project terraie is hilly, ranging <br />in elevation from approximately 8,360-ft above mean sea level to 8,700 ft. The as-built wnfiguration <br />of the facilities are shown on Drawing No. 14711-103. The main features of the tailings disposal <br />area wnsist of a continuous composite liner system wnsisting of compacted, low permeability soil <br />' and a geosynthetic membrane over laid with an underdrain system, two major earthen <br />embanlQnents, a seepage wllection pond, a tailin~v delivery pipeline, a runoff diversion channel, and <br />a water return pump back system. <br />' The two major earth embanlanents were constructed to contain the tailings slurry. The Main <br />' Embartfrntent (most downstream) is designed primarily for the containment and stability of the <br />tailings mass. The Sputter Embankment (located in the center of the impoundment) is designed <br />to separate the impoundment into two cells and to house the surface water return wells for recycling <br />' the tailings water to the mill. <br />' The Seepage Collection Pond is located at the lower reaches of the tailings disposal facilities. The <br />pond has two synthetic liners with a leak detection and recovery system for maintaining and <br />wntrolling potential leakage through the primary liner. A pump station at the collection pond <br />' ceturns the seepage water to the impoundment surface water pond for rerycling to the mill. A <br />double lined collection channel connects the tailings impoundment liner system to the seepage <br />1 collection pond liner system creating a closed system. <br />A 5,000-ft long water diversion channel was constructed around the south side of the tailings <br />' disposal area. This channel will intercept surface water storm runoff from the major drainage <br />located above the tailings disposal area and routes it around the facilities. There are no perennial <br />' seeks in the drainage. <br /> <br />' 1 <br />1 <br />