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<br />Pitch Project Memorandum - September 13, 1984 <br />is from Saguache, Colorado, which has a very different physiographic <br />location than the site of the Pitch Mine near Marshall Pass. Saguache <br />is located near the northern erd of the San Luis Valley on the east <br />side of the La Garita Mountains and the Cochetopa Hills, It is in the <br />rain shadow of these mountains and is quite arid. The area of the <br />Pitch Mine on the west side of the Sawatch Fange at a considerably <br />higher elevation than Saguache receives considerably morn moisture. <br />E;;trapolation of the data from Saguache to the Pitch Mine is net <br />valid. There is prohabiy data available frem locations that more <br />closely appro:simate the conditions at the Pitch Mine. One has only to <br />have Seen near the Pitch Mine in the springtime to 4::no:v that there is <br />water .available for infiltration and r!:naff on a yearly basis. The <br />conclusion reached in the re^ort is cbviously not justified. <br />Subheading: v.i.1.2 Leaching of the Ore Files Pram Single F'recipit.ation <br />Pages. 5-o to J-tr7 <br />r'.uga .cj-J - i eaCh cra=tlQn <br />ithough the r=s~.lts of a series" ^f '_~ach tests are Guct=d few <br />details are given as to conditions of the tests ar the starting .mater- <br />ial. <br />__e ~-6 - iiydralagic r'^aracteristics of !~l~.ste .'ile <br />I) The erperimen±s far determining the _.ansit time of water <br />through the waste pile are ..~~t cescri~,ed and na results from these <br />=.:per:ments are given. Then= is ..^,o c!ata cresented th-=,t permits an <br />e~:ai_:atiari of the =anserv~ativeness at the esti:T.ate cf fetal Transit <br />_.T.e Cf ifi~) ..,..---'_~S `'ter a ^.iie •eight ..- __ feet. ?'!-;e.-e i= ;;J _~t.= <br />given regarding ±he ,_P:ar.acteri='~ics of ...,_ .Tate-i_,a in _he _. _ -tock:- <br />-;i4e t=rein eize -'_-, .notion clan -or.te^t i`_v, cer^eatilit. ) <br />r..~_ 7• s ~ par-= <br />Cr ^f _„_ ¢°o_ _'li?° '3a :t 15 no_ r.n551~_e t7 ~-__, ..,_.._ .- _.._ _~StS <br />.;ere awe,-+_;.ater °imulaticn=_ cf _,ctu=.1 _.-ndit; =n=_., . _ ..~.~ ~ seer. .^dicated <br />in at%-:er `-OLL:li1%?!:ts that tte pii~=s :na•/ contain __ua=a tram the .•:ater <br />fro.=tment pard ;-.hich prcb_=,nly is ccrsid.s~?bl•:, f:^.=r-_rai^ed than the <br />rest of the materiels in _. ,e piles. if the sio^ge .e present ..s dis- <br />crete layers the fi-:+ of =;ater thrcugh ±he pii==. mi:y~~ r,e r_~~2v <br />i,rpe~ed. <br />~> The a>s':mptian t^.at the water will ae-caiat= r._,picl•J through <br />the =tccF.:pile and ~_ :ii=_charged is .=ry :,!?esticnanie. ~nclasing the <br />stack:piies .:it'^. a _-foot clay ;rn,erlay:rent and _. _-_..ch clay ~.=:p ;viil <br />limit infiltration intn the piies b~_tt 'r;ill else iTpede the ~,scharge <br />of any water that ~-~_- enter. The relati~iely i:nperm=abizlclay enclosure <br />may greatly increase the ref=_..^.tion time of fl:_sids in the piies. The <br />st~_idy wo~_Qd hav= do}ter =_.~ulated ac±,;al conditio.^.=. if lonG_er , 2ten- <br />*_ion times for the fluids had besn considered. <br />3) The assumation that the ;eater will percolate rapidly through <br />the stockpile is al=_o not necessarily a :=anserrative'ane necause it <br />assumes a short leach time far the w-stet. 4 longer retention time in <br />4 <br />