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13A9'1'l.k MOUNTAIN R1~SUUIZC6S, 1NC. <br /> <br />October 1, 1993 ~oc~+~ <br />F <br />To: David Marshall, Core Laboratories <br />From: Anne Saldrige, Alana Scott ~ <br />RE: ADDITIONAL TAILINGS GEOCHEMICAL TEST WORK, SCAN Li17S <br />PROJECT <br />As we discussed during our telephone conversation on <br />September 29, 1993, we will be sending five additional tailings <br />solids samples and five pore water samples. The samples are <br />designated as follows: <br />X14 15-26.5' <br />,~15 35-35' <br />45-55' <br />/16 35-45' <br />45-55' <br />Pores fluid samples are d®signated with a PF foll.owiny the hole <br />and depth. <br />The tailings solids should be tested following the same <br />program as the previous samples. This program is oltli.ned <br />t>elow._ <br />The tailings solid sample should be split into two <br />portions. The first portion should be tested as is, while the <br />second sample should be rinsed with deionized water (ar9justed <br />to a pH of 5.0 - 5.5, no less than 5.0). The rins~nG is to <br />evaluate the potential tailings behavior over a long period of <br />time after any buffering effects from the processing activities <br />havo been flushed from the system. Rinsing should bo <br />accomplished by mixing at about a 20 to 1 ratio (liquid to <br />solids) in a closed container with zero head space or an inert <br />gas head space (argon gas). Allow the solution to equilibrate <br />overnight. Decant the leachate and test it for pH and <br />conductivity. Continue this rinsing procedure until thfe pH of <br />the leachate has gone ar_idic or has stabilized for at least <br />three leaching cycles (a minimum of five rinses). Thr~ <br />quantities of solids and leachate should be tracked throughout <br />~ sursuunxrur~unriu: eaurn~ran eur.u ruvrnrvr <br />r.n.ru>xnu s.nrvi.uis,cr>roenrx~ Kus_awro nenau.v~az rnzrrr,~a~~.~se~ <br />