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<br />' Battle Mountain Ruoumu, Inc. i 112 Permit Modification <br />' D.3.3 Material Characteristics <br />D.3.3.1 Geotechnical Characteristics <br />The geotechnical characteristics of the waste rook, outlined in the <br />' approved permit, have been used in the design of the pFoposed waste rock <br />disposal areas. A complete discussion of these characteristics can be found <br />' in Secfion D.3.3 of the approved permit. A brief surtlmary is provided <br />below. <br />' The waste rock disposal facilities have been design assuming that the <br />Santa Fe Conglomerate materials may be deposited in y area. This is a <br />conservative assumption since the Santa Fe Conglomerated is anticipated to be <br />' the least competent constituent material of the waste roc~C. The presence of <br />the more competent gneiss waste rack materials in any portion of the facilities <br />' will generally improve the long term slope stability. <br />The engineering properties of the reworked conglomerate waste rock <br />' and native foundation materials have been estimated us' g classification test <br />results presented in the original application in conjuncts n with correlations <br />from the engineering literature. For end-dumped waste k, a friction angle <br />of 35 degrees and no cohesion have been assumed. A friction angle of 33 <br />degrees and no cohesion have been estimated for the foundation materials <br />' beneath the waste rock disposal facilities. <br />' Section D.3.5 of this document discusses the stability analyses for the <br />revised South Waste Rock Disposal Area and Disposal Area B. <br />' D.3.3.2 Waste Rock Geochemistry <br />' The uppermost geologic unit found in the West Pi~ is the Tertiary age <br />Santa Fe Conglomerate. The Santa Fe Conglomerate is mposed of gravels <br />and cobbles in a primarily silt and clay matrix. low the Santa Fe <br />' Conglomerate lies the Precambrian age pink gneiss, and low the pink gneiss <br />is a biotite or biotite-amphibole gneiss (referred to he r as biotite gneiss). <br />t These rock types are anticipated to be the primary mate>~ials comprising the <br />waste rock and pit backfill material. <br />J aY D~ ~cet o. <br />