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0 <br /> <br />SCOPE <br />This report presents the results of our Stability Evaluation for the existing coal <br />processing waste pile located on the eastern portion of the Golden Eagle Mine in Las <br />Animas County, Colorado (Fig. 1). Our proposal No. 95-970 was for a geotechnical <br />investigation and design for the proposed Upper Ciruela Canyon Coal Processing <br />Waste RDA to be located on the west side of Ciruela Canyon, southwest of the <br />existing coal waste area. Due to the imminent closing of the mine, Basin Resources, <br />Inc. revised our scope of services to instead provide this stability evaluation for the <br />existing coal processing waste pile. <br />This report includes results of laboratory testing of samples of the existing <br />• <br /> <br />waste to obtain information regarding the gradation and strength properties of the <br />waste, and analyses of the stability of the existing coal processing waste <br />configuration including a parametric analysis of varying waste material properties, <br />slope face configurations and water level conditions. Previous investigations of the <br />stability and/or density of the Refuse Disposal Area (RDA) located west of the <br />Golden Eagle Mine have been performed. We reviewed the strength testing <br />performed on samples of the coal refuse taken from the RDA for this investigation. <br />~'~he, co]icJ.r~siops°presented in this report are based>on our unde,rstan,dimg of <br />the-.cubyen~t~eor~iguration= of t.he. coal process(rngl.waste pile.r•Analysis related to <br />temporary or permanent surface water control was not included in the scope. We <br />should be contacted to review our conclusions if the actual configuration differs from <br />the configuration used in this report. A summary of our conclusions is presented <br />below. <br />SUMMARY OF CONCLUSIONS <br />1. The.toPographic map based .on a,fli <br />ipolca~esithe Gower 20 feet . of the <br />(ho~iontal vertical~"and t~.,'e upper; 31 <br />2 5"1 'and 4 1. Basin Resources, I. <br />°5tiaste- was: placed,. al.o~°'iFie ,dace <br />performed on March 23,x.1995 <br />eris .sloped at about°a 2 5:1 <br />e ro ~ ga " e is sfoped.'tie v~Yeeri <br />iridicated that adddiona coo(' <br />the pile anii 'th'afh#he current <br />BASIN RESOURCES, INC. <br />GTU"f 27,79] <br />