Laserfiche WebLink
P9-16-?2 f,~.~~r'>,` F°Ols S.E. 6 R. DENVER FG- <br />M1IEMORANUL'Ai <br />STEEPEN ?CBEgTS~N aNn :.iaaTFp <br />TO: Ms, Alana Scctt ($attle Mountain Gold) <br />FROM: Kent Peter (5teffen Robertson and Kirsten (U.S.), inc. <br />DATE: September 16, 1992 <br />SUBJECT: Tailings San,Ed;ng arttt Tenting far Tnplace Densities (BRIG Project No. 14715) <br />This phase of work will be only for su~cia: beach dersity value.9 of existing tailings within the upper <br />and lower disposal areas of the San Luis Fhasc 1 talling~ ic,puuudment. These values are oNy to <br />provide a "snap-shot" of current densities to aid in predicting the schedule of the required <br />impoundment raise. <br />Sandcone Densities <br />Dependant upon access "by foot', we propose to perform up to 12 inplace density tests. The <br />number of tests will depend upon tie nature of the he.ach materials. From visual inspection, <br />sandcone testing appears to be viaclc in the upper impcundment, however, limited success is <br />anticipated in the lower impoundment. <br />These tests wlu be generally taken at the surface of the tailings, !n cases where the surface is firm <br />and in a non•saturated state, we will attempt to obtain tests below the surface, i.e., !i to •12 inches <br />in depth. All sandcoue densities will be perfurmed per A5T2.4 D•]3d6 procedures. Wet densities <br />will be determined at the site, while moisture and dry density values will be determined in our <br />Lakewood laboratory. <br />Densities ~y Tube Samplers <br />Where sandcone density testing is not possible due to the astute of the tailings, two methods of <br />tube sampling will be attempted. Samplln6 will be limited to the upper 5 ft of tailing. Neither of <br />the lulluwing sampling techniques are capable of pr:tetrating the drainage layer overlying the liner <br />system. <br />