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ID~ <br />RUG 24'94 7.42 No .001 P,05 <br />'17+c fnnr lithologies of J/1, ahnve, arc grouper! ou the basis that none has bcc;n signific~xntly affu;letl by <br />the hydrothp'mal pritcessex which fotnted the mineral deposit. As such, Ihcsc rocks ~{mtaiu essentially <br />no added metal sulfides beyond those which occur as deu•ital debris (i.c. scattered picks of mineralized <br />rock eroded from exposer! footwall gneiss). The total sulfide concentration in these rocks ranges from <br />zero to tract (i.e. <.5) volume percent. <br />Unit //2 and #3, ahnve, wnsist of footwall gneiss whicL is typically moderately to big dy ahcred and <br />variably mineralized from subeconomic (}/3) to economic (#2) gold grades. Aheratiot in Ihcsc rocks is <br />both pervasive :utd vein and/or fracture controlled and typically utnsists of, from gre:~tcst. to lease, silica <br />(quartz), scricitc (mica), chlorite, spccular hematilo (iron oxide), magnetite, clay, duq'ritc, and adu)aria <br />(rnicmeryslalline form of potassium feldspar). Mineralization consists of, in decrcasi~g abundance, <br />pyrite, chalcopyritt:, galena (rare), and nutlybdcnite (rare). Gold mineralizatiwt has a general overall <br />aurclation with total sulfide content, ahhough there are areas of high sulfide minerali anon which have <br />very low wn~n-detaaable gold grades. Despite this lack of pcrlcct correlation, ore radg material, for <br />the tlcposit as a whole, has a higher overall sulfide wnccntration than non•orc grade raterial. As a <br />gerrerul statement, ore grade jootwall gneiss may contain up to and totally greater thtin 10 vol % local <br />sulfides (pyrite»chalcopyrite) but averages less than K vu1%. At contrast, sub-ecu~omic fonttvull <br />grreirs (i.c. waste mck) may wcuain up to and locapy greater titan S vol'yn total sulfic cs <br />(pyrite>.>chalcopyri[e) but overall averages touch less than 5 voly~. <br />J-'ur the proposal backfill area of the "Deep West Pit" the relative trnrnages and cony~ositions of the <br />original rock rentovCd, and those of the proposer! backfill materials, Arc listed below (lollttages providul <br />by I1Mitl engineer Scott Curry): <br />Original lunrmee;_artrl cotnnnsition of area ni "Deco West Pit" nroposeJ jar li~tckfillir~g <br />'1'a'riary Santa Pe I~m 1,140,930 funs <br />(Quaternary alluvium end subjacent <br />clay zcme where present) <br />wtaltered hattgingwall rocks <br />Precambrian "pink gneiss" 1,711,901 tuns <br />(and subjacent clay zone wha•e prescnU <br />tmahererl/unrrdnerulizer! hangingwall rucks <br />altered/htineralizedfuolwull rnrkr <br />Pnolwall Gneiss Waslc Kock 1,458,737 tons <br />footwall Gneiss Ore <br />2 ,852,83] lots comhinal <br />4,23],560 gnmhined ahcrul/ <br />2,772,823 tons mineralized) footwall rocks <br />Cumpasitiort. artd loneaPec. of "Gneiss P& Area" materials nmPused aa• 6ackfill Ibr the "Deep Wcrt <br />Pit" ~__r_.._.. <br />'1'cninry Santa Fe Hm 740,793 tons <br />(Quaternary alluvium and subjacent <br />clay zone where present) <br />4,025,993 (wts combined <br />unaltered 1#ntgingwnll rocks <br />D. M. Dates Page 2 Geology of Pirtpwtrl <br />Muy /444 I)'ne~q Wrcrtr /lurk <br />