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1.0 PROJECT DESCRIPTION <br />1.1 PROJECT BACKGROUND <br />The San Luis Project is an inactive open -pit gold mine located in Costilla County in <br />south - central Colorado, approximately 3.5 miles northeast of the town of San Luis (Figure 1). <br />The mine facilities, as shown on Figure 1, included two adjacent open pits, a milling facility, a <br />lined tailing facility, a pipeline from the milling facility to the tailing facility, a water treatment <br />plant, and six waste rock disposal areas. Active mining, milling and tailing disposal occurred <br />between 1991 and 1996. The mine currently is inactive and the pits have been backfilled. <br />However, management of groundwater collected at the mine site is on- going. The tailing facility <br />continues to be used for storage and evaporation of groundwater and brine from the water <br />treatment process which are delivered via pipeline from the mine facilities. <br />San Luis Project <br />Tailing Dam Data Report <br />Figure 1 General Site Map <br />L <br />Miller Geotechnical Consultants <br />February 2014 <br />