REV102496

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Name: ENCLOSURE 1
• Type & Sequence: AM6
• Media Type: D
• Archive: No

Jeffrey A. Pontius

•
A wide vanary or hompgerkzabon temDartMes have bean
recortlstl in fluid inclusions witmn the dittnet trom +500°C to 100°C,
althoupn it aopaan that the bulk of [he gold was deoosrtad N [ne
emtharmal range at wound 180°C. The gold nllurida vpna snow •
very high degree of umfdfmlty over • large vanrcal event 1+3.000
feet) su0geatlnp no currarnry defined zonation rotated W boiling. Some
fluid inClutiona are over prateund with COz .
Cumnx fluid inclu4on den lapProxlmateh 100 tamWasl
intlicates Men has bon two Drerury Msrmal awnu. The first wen[
has nmoeretuns rartpmg hom-220? to +500°C IDweINy, 1984,
Rayndda. 19921 with eelklivaa Onenr Man 40 equmNm wt. % NeG.
Thia innial Mermel wam •OCNfed n seven) anu Of Me district
prtdueing broad eerieita ~fksredon zones. Thit nigh nmperrture
system had onH minor atsoeieted poW but prodi7CW • aiq[dieent
amount of host rock parrtleabidy Mrouph extaneiva alnnnon of K•
feldatnr aril msfie Dhetkldryan IPornius, Butts 1991). Data to den
stronpW eupp[w a magmebe a porphyry Noe aignttura n Mrs highN
temperatun event.
The tapor[d Menial swam hoe bNn recorded n mulvpn win
sta0u, all with temperature n the 100° to 250°C range w1M moat
duannnp at eroud 180°C. Thee nelualont nnga between • 1 and
B egwvalem w[% NaCI. Mort of MO gold Nllurida end napes 0old•
ovrite minenlixapdn dlspownd to date u astowted with Ma lower
[elnparitY(e aV4m.
Oxvgan itotOpe samdaa haw bean collaeted Mroughout the
distnpt Isee Table II. Oan shown in Table II from a USGS study of Ma
Pharmacist vein evs[em snowed Md fluids wars domrnandv mapmane
in origin ISilWrman, 19921. Tha d0" value for Me mom gold nuunda
win ryatem wet apprbxlmatoly + 20%. Values in Me parwhant K-spar
altered wall rock ma[anal around the tleposn ono nave a mapmme
signetura. although otitis an peneraoy less roan * 10% sugget[inp
some mrxing Of metepriC water. The K-soar alteratl wall ropk around
the nigh pratla vein it mineralized with ditteminaied native gold antl
PYrin. Corrected d0° water ttabinty values for the quartz veins IAu-
Tellurldel are 1n the + 1 to +9 range an0 -2 to + I range for K-soar-
Pvrlte allefaLlpO.
Table I
Distnct-wide o0" Analysis
dleo % also
Samote Oescnptwn Mineral Ore F#id
Grassy vanev
Quartz - 14.9 - 9.6
Ouanz - 11 .2 - 5.91?I
Quartz 6.3 - 3.0
Quartz .10.3 - 5.0
Quartz - 7 9 - 3.8
Wddhorse
K-leldsoar + 10.5 - 0.3
Quartz • 16.2 - 3.2
POnland
Quartz - 14.8 - t.8
K~feldsoar - t0.fi 0.2
Cresson
Calcite • 17.3 - 6.6
Quart: .16.0 - 3.0
Ouartx - 17.6 < 6
Quartz -13-8 + 0.8 _
DYarQ - 18.2 * 5.2
K-soar - 5.8 ~2.0 =
K-soar - 10.8 0.0 =~
K-sear - 12.0 + -1,2 .-
K-soar * 12.2 + d.4
K-spar - 10-3 - 0,5:
TabY 11
PHAgMACIST VEIN OICYQEN ISOTOPE DATAs
tl180 0180 d180' ~ _ d180.-
TEa~t-•c 1QI7,1 ltla91 189WS' iT _ a'o-
220 +20.72% +8.7% +t0A8%~ +1.5%•
From Ms ilea wedahN R appeMS dta minefaYZirq Ikllde begwt
is primarily maprtlabt end ettxeded Mrouph major tplrbpaY Mrduib.
TMte megmax .huida may haw trentpprtad odd H sane+Npe of
nlMO or bis[rMide eompbx. Gab Wposmm n Meganeu.eortduu:
otxtes pnmanfy ea poll nllurdes. .-,~-- --
At 1M mapmapC tolubont mpvad put No the pMlMabb Mrl
rock. Ma gold Waring Huids mixed with mauorle waterrThis enixalg
aril coding inidsta0 dapotidon of OisaernsutN naves gd0 aril pyrin
Through eulfidetgn. The lack M t'dnattard nqurium anorrHliea n the
lovwr gretle vanes gold and pyme rvrtam tugpun Mrt gold ifanaPat
may nave been Other than tslkrro compfexu such as d1i0 a biarrHide
complaxinq.
OoM of the gold avsteme appear to new hatl hqh Ywlt o} CO;
aispibuted ahi oupnout then vamps) extent, Tha deeper wtxtitigs n the
dlatrlpt era eurrantly vantlnp ensntlva amounn of COt slag tW males
vemt. One posalDU source for Mie pipe amounn of COr read W Ma
depeemg of a carbonate nch magma lcarbonatital rt da1sM.
AGE DATES
A {imite0 number or spa dates have bean tomplatad in the
Cripple Creek d~s[nct, althougn seven) analyua era pending. The
svanrtas nave been tlatetl by MPDOwall 179661 at 34 z 1 m.v. IK•Arl.
wa0u:119761 dazed the pnonolttes between 29.3 and 27.9 x .7 m.v.
i K•Arl. Ketlev 119921 vas obnmed oases or 31 to 32 m-v. lAr-Ail for
[ha mom ononrrtte invuslve event. ins Keoev 119921 ape dates
suggas[ the more maSK pnonontes are younger [van me felsle unlta.
while 6irmingnim I1 9911 feels the nveree it tNe based on whgle rock
chemical tlaB. 5[ranprapmc Oita R Currently embrpu0ut and pan not
confirm eitnar nyootnesls. Recent data vas shown Mat the volcanic
rock may tie older roan provi0usly Moupht lipproxlmanly 35 m.Y.l and
[net soma previous tlates CPUId nave bean contaminated.
Currendv mere are anW a taw dates on [ne mmMhzrtion one
astocian0 al[erandn at Cnppla Creek, although fevMl en pendmp.
Lead isbtooe Data are still pendmp ono will ha1D shetl tome hpht On the
bminq Of minefalixatlOn. Flom tn! data we nave IO data R appears that
the mmennZmq evlni3 CIOSeIy fOllpwep [N mom vO1Gnq aptrNN and
may have Oeln rllatld tP a lira SOq! Wirimaln: mttptive awn[.
CONCEPTUAL MINERALIZATION MODEL
From the axlstlnq Bata Ma IdbwmO conceptual modN nee been
oevelopeo Isee Figure 61 for me Cripple Creak gold ewtem.
Tna mom mmarae:m0 aatOda Clotaly Idlowap tM waning.
stage of volcanism ana duvamal aenvity. Tha irxhal n4tiwW h1pR
• RAtiDOL AT MINEXPO '92 101