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P u b l i c - d a t a F i l e 8 8 - 2 4
PRELIMINARY GEOCHEMISTRY O F THE NORTHWESTERN P O R T I O N O F THE MT. HAYES A-6 QUADRANGLE, SOUTHCENTRAL ALASKA
K.H. C l a u t i c e , D.N. S o l i e , G.H. P e s s e l , and T . E . S m i t h i n cooperat ion w i t h t h e U.S. B u r e a u of M i n e s
A l a s k a D i v i s i o n of G e o l o g i c a l and G e o p h y s i c a l S u r v e y s
S e p t e m b e r 1988
T H I S REPORT HAS NOT BEEN REVIEWED FOR TECHNICAL CONTENT (EXCEPT A S NOTED I N
T E X T ) OR FOR CONFORMITY TO THE E D I T O R I A L STANDARDS OF DGGS.
3 7 0 0 A i r p o r t Way Fairbanks, A l a s k a 9 9 7 0 9
CONTENTS
Page
INTRODUCTION ............................................................................................................ 1
ANALYSES
Rocks ................................................................................................................... 2
Stream sediments ........................ .. ..................................................................... 16
Pan concentrates ................... .. .......................................................................... 18
SAMPLE LOCATIONS AND DESCRIPTIONS
Rocks ..................................................................................................................... 20
Stream sediments ................................................................................................. 26
Pan concentrates .................................................................................................. 26
..................................... SAMPLE PREPARATION AND ANALYTICAL PROCEDURES 27
ILLUSTRATIONS
.............................................................................. Figure 1 . Sample location map attached
INTRODUCTION
The preliminary geochemical data presented in this report were collected during the 1988
field season as part of a geologic mapping project in the northwestern portion of the Mt. Hayes A-6
Quadrangle. Listed herein are the analyses of 21 4 rock samples, 8 stream sediment samples, and
10 pan concentrate samples; a geologic report and additional data will be prepared and made
available over the winter of 1988-89. This study was conducted as part of a cooperative agreement
between the U.S. Bureau of Mines and DGGS to investigate the geology and mineralization of the
Valdez Creek mining district.
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STREW SEDIMENT ANALYSES
Sanple
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PAN CONCENTRATE ANALYSES
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Br ie f rock sample description a r g i l l i t e u i t h qtz veins argi l l i t e with qtz veins argi 11 i t e u i t h q tz veins argi l l i t e u i t h qtz veins argi l l i t e u i th qtz veins a r g i l l i t e u i t h qtz veins a r g i l l i t e u i t h q tz veins a r g i l l i t e u i t h q tz veins a r g i l l i t e u i t h q tz veins
a r g i l l i t e u i t h q tz veins
a r g i l l i t e with qtz veins
argi l l i t e u i t h q tz veins
a r g i l l i t e and green tuff in creek f loa t blue-gray, v. fn-grained rock u i t h abundant s i l i c a flooding/calcite veining
blue-gray clay, weathered version o f 33248, abundant i n drainages. massive pyr i te f l oa t i n v i c i n i t y of very p y r i t i c basalt and hornfelsed seds Joy Creek 'skarno, very f i ne l y fractured, pyr i t i c , qtz-epidote rock fractured conglanerate; Limestone, intrusive, qtz, erg. clasts i n black argi l l i t e matrix qtz vein, about lO@wide, minor malachite and azurite black, Un-stained fe l s i c t u f f qtz-carbonate veins u i t h pyrite, hosted by altered fe l s i c t u f f gossanous p y r i t i c t u f f m f i c dike with qtz veins, malachite, azurite, sulfide; i n f e l s i c t u f f un i t
brom-meathering intermediate mete-tuff
very altered greenstone(?) u i t h pyrite, ~e-sta;ning qtz-carbonate veins i n altered greenstme
p y r i t i c med-grained fe ls ic intrusive i n greenstone rubble very Fe-stained basalt
Fe + Hn concretionary nodules
1 ight tarnish weathered fe l s i c dike intruding 'Jan argi 11 ites, u i t h disseminated pyrite.
pyr i t i c , Fe-stained dark blue-grey hornfelsed argi 1 l i t e qtz-carbonate veins
ap l i t e dike i n grani t ic intrusive pyrrhotite-bearing b i o t i t e grani t ic intrusive c lasts of black a rg i l l i t e , basalt and fe ls ic intrusive cemented by ca lc i te fe l s i c dike with disseminated pyrite/pyrrhotite qtz-pyrite-epidote veins, 'Joy Ck skarn'
Elev - 4500 4750 4800 5200 5000 4750 5100 5100 5100 5100 4740 4680 4580 4300 4350 4350 4550 4450 4370 4380 4250 4130 4100 4050 4580 4540 4510 4480 4520 4500 4480 4460 4450 4440 4430 4420 4410
Brief rock s-le d e s c r i ~ t i o n grey sul f ide zone i n s i l i c i f i e d rock, 'Joy Ck skarn'
malachite coating on greenstone qtz-carbonate veins brecciating greenstone, 'Copper Knob Peak'
qtz-epidote vein in basalt with pyrite, chalcopyrite, malachite, about lo rn wide
qtz-carbonate veins i n fractured basalt black a r g i l l i t e with tp t o 40% white veining along fo l i a t i on
grey Limestone with white ca lc i te veins and brown-weathering veins
veins i n black a r g i l l i t e orange-weathering calcareous veinlets i n argi 1 l i t e
veins i n black argi l l i t e very weathered qtz-carbonate- limi t e betwen t u f f and argi 1 li te/limestone
veins i n black a r g i l l i t e massive uhte carbonate Lens, about 10' thick
orange-weathering veinlets i n black a r g i l l i t e veins i n black argi l l i t e fractured Fe- and malachite-stained greenstone above fe l s i c dike i n 'Joy Ck'
Fe-stained, fractured p y r i t i c basalt extremely s i l i c i f i e d blue-grey and maroon rock, orange-weathering very weathered orange rock f ran clay al terat ion zone, 'Joy Ckl
gossanous fe ls i te t?)
massive chunks o f gossan on slope, possibly fe r r ic re te
altered, p y r i t i c greenstone black gossan material from d r i 11 pad area black gossan material i n cat trench/dri 11 pad
a r g i l l i t e with qtz veining a r g i l l i t e u i t h qtz veining a rg i l l i t e u i t h qtz veining a r g i l l i t e with qtz veining a r g i l l i t e u i t h qtz veining white qtz veins with cream-colored mineral i n greenstone i n gu l ly f loa t
a r g i l l i t e with q tz veining a r g i l l i t e with qtz veining
a r g i l l i t e with qtz veining
composite chip sanple, rusty veins i n folded a r g i l l i t e
a r g i l l i t e with qtz veining
a r g i l l i t e u i t h veins, i n place a r g i l l i t e u i t h qtz veining
Sec - 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 11 11 11 11 11 11 10 10 23 11 11 11 11 11 11 11 11 10 10 10 1
Elev - 4400 4390 4380 4370 4360 4350 4330 4320 431 0 4300 4300 4300 4380 4380 4400 4430 5250 5150 5150 5150 5120 5200 4310 4200 5200 4800 4770 4850 4770 4850 4820 4820 4600 4520 4680 4510 4780
Br ie f rock sample description a r g i l l i t e with qtz veining a r g i l l i t e with qtz veining f loat fragnents of rusty q tz veining i n argi l l i t e , same creamy-colored minerals
argi l l i t e u i t h qtz veining a r g i l l i t e u i t h qtz veining a r g i l l i t e with qtz veining a r g i l l i t e u i t h qtz veining a r g i l l i t e u i t h qtz veining argi 11 i t e u i t h qtz veining a r g i l l i t e u i t h qtz veining a r g i l l i t e u i t h qtz veining a r g i l l i t e u i t h qtz veining uhi te qtz-carbonate veining i n Limy argi l l i t e , not very rusty, 8 f t above greenstone rusty, qtz veins t o 1" th ick i n a rg i l l i t e , i n place, 12 f t above greenstone a r g i l l i t e with qtz veining a r g i l l i t e with qtz veining br ight orange ueathering carbonate veining i n a rg i l l i t e , similar t o veins aroud fe ls i tes brecciated qtz-carbonate veins u i t h t h i n ha i r - l i ke orange veinlets i n s la ty erg. below 1s concordant veins i n folded argi l l i t e concordant veins i n a rg i l l i t e , saneuhat Limonitic, some orange calcite, some white calc i te
banded, s l i gh t l y rusty qtz veining i n greenstone outcrop concordant 1.5" qtz vein i n a rg i l l i t e , typical rusty vein
rusty calcrete(?) or sinter(?) rusty calcareous tufa or celcrete around modern-day cold spring thin, 8U zone of malachite-chalcopyrite-pyrrhotite(?) bearing enygdaloidal basalt bleached yellow-white f e l s i t e dike with iron-oxide pits, adj. t o pyr i t i c , rusty t u f f
greenish, p y r i t i c t u f f next t o fe l s i c dike punky, dark maroon gossan adjacent t o altered fe l s i t e dike altered tu f f (?), much i ron oxide red, hematitic soi [/rock chips a t fe ls i te / tu f f<?) contact; br ight brick-red soi 1 rusty, schistose fe l s i t e dike(?) p y r i t i c green tuf f or flow rock assoc. with fe ls i tes fe l s i t e bodies trending down gully, cutt ing a r g i l l i t e belou marker limestone rusty weathering bleached fe ls ic intrusive above older calcrete deposit.
green, altered p y r i t i c intrusive(?) or tuf f (?) greenish ueathering, water-uashed, altered tuf f (?) i n stream rusty-ueathering, p y r i t i c rock (meta-tuff?)
sec - 1 1 1 1 1 1 1
12 12 12 12 12 12 12 12 12 12 12 12 11 11 10 10 12 12 12 11 11 11 11 11 11 11 11 11 11 1
Elev - 4700 4 700 4700 5100 5200 5250 4750 4750 4750 4730 4700 4770 4750 4880
4880 4700 4700 4700 4700 4850 4800 4510 4400 4900 4920 4920 4530 4530 4530 4530 4530 4530 4530 4530 4530 4530 5300
Brief rock samle desc r i~ t i on rusty, p y r i t i c fe ls i te(?) rusty, p y r i t i c f e l s i t e fractured, p y r i t i c f e l s i t e with black manganese stain on fractures greenish, rusty weathering, plnky p y r i t i c fe ls i te, py to 30%, gossany surface 2" wide rusty zone i n f e l s i t e dike 40-50 f t diameter qtz outcrop on s ideh i l l p y r i t i c veins cut t ing greenish altered intrusive body, ~ned t o f n grained rusty ueathering, orange qtz-carbonate altered greenstone s i l i c i f i ed , orange breccia i n altered felsite(?), Fe-oxide c lots af ter pyrite(?) Fe-oxide cemented argi 11 i t e breccia brecciated, fe-oxide stained f e l s i t e si l iceous webuork, with i ron oxide Lining p i ts . qtz-carbonate vein material from a r g i l l i t e section rusty q tz cut t ing a r g i l l i t e f l oa t limy a r g i l l i t e f loa t with akndent malachite rusty qtz-carbonate breccia pyr i te - r ich greenish tuff(?), f loa t gossan float, Fe-oxide a f ter pyrite(?) pyr i te - r ich greenstone, layers of py r i t e along fo l i a t i on pyr i t i c , iron-oxide stained f e l s i t e or a l tered t u f f p y r i t i c f e l s i t e cut t ing bleached tuf fs, a1 1 iron-oxide stained green t u f f with 30% punky, iron-oxide gossan
rusty, p k y ferricrete/calcrete
p y r i t i c greenschist i n metatuff sequence wi th in bleached zone s i l i c i f i e d f e l s i t e i n heedwall with some malachite/azurite sta in on fracture surface limi t e stained,py-bearing f e l s i te, brecciated 8 rehealed w/ qtz, some malachite/azuri t e altered felsite(?) cut by 11' qtz-carbonate vein with cockscarJ, texture, rusty s i l i c i f i e d a rg i l l i t e (? ) cut by qtz vein, open-space textures, limonite
rusty argi 1 l i te, brecciated, small q tz veinlets brecciated fe ls i te, dissem iron-oxide, stockwark qtz veinlets w/ sane py, orange weathering rusty f e l s i t e cut by 1/4" qtz veins, orange weathering brecciated f e l s i t e with qtz veinlets i n stockwork rusty, aphanitic fe ls i te, dissem iron-oxide t o 5% qtz veinlet cut t ing aphanitic f e l s i t e altered f e l s i t e with orange l imoni t ic c lo ts and greenish alteration, br ight orange limonite
brecciated fe ls i te, stockwork qtz veinlets and dissem py and iron-oxide altered t u f f and tuffaccous a r g i l l i t e with pyrite, arsenopyrite, chalcopyrite, galena veins
Sec - 1 13 14 13 13 13 13 13 14 14 12 12 12 12 14 14 14 14 14 14 14 14 14 14 11 14 14 14 14 11 11 10 10 11 11 11 11
Brief rock sarrple d e s c r i ~ t i o n 1-1.5' white qtz veins u i t h malachite stain, some bornite i n meta-tuff un i t approx. 1 f t uide bul l qtz vein u i t h malachite s ta in pyr i t i c , orange-stained feldspar-qtz body, i n or. stained tu f f , chlor i te-al tered greenstone s l . altered greenstone u i t h rare py r i t e or pyrrhot i te a t edge of orange-stained greenstone
mcd. altered greenstone, u i t h qtz veins aprox. I--, 25 f t into orange-stained zone
qtz boxwork u i t h gossan, about 75 f t i n to orange-stained zone
limonite-carbonate altered greenstone, about 100 feet i n to orange-stained zone pyrit ic-brecciated fe l s i t e i n middle of 1/4 mi wide orange-stained zone
altered greenstone near fe l s i c intrusive
p y r i t i c f e l s i t e near 33860, greenish s ta in altered tuffaceous schist f e l s i t e with minor pyrite, some minor yellowish-green stain
f loa t of orange-stained, weakly p y r i t i c f e l s i t e f e l s i t e body, about 50 f t wide, intruding tuffaceous schist, abndant pyrite/ l imunite 6" qtz vein with rusty- weathered fracture f i l l i n g i n greenstone, malachite, rare chalco orange-stained, moderately altered greenstone pyroxenite with sulfides f e l s i t e body i n qtz-carbonate veined t u f f f e l s i t e u i t h pyrite, abundant Limonite s ta in
aprox. 1 f t wide f e l s i t e dike i n dark green crystal t u f f aprox. 15 f t dike o f p y r i t i c f e l s i t e i n greenstone p y r i t i c f e l s i t e
uhi te quartz veins i n black argi 11 i t e carbonate veins i n contact zone of black argi lli te/greenstone
300 f t above argill ite/greenstone contact; rubble crop of black a r g i l l i t e u i t h qtz veining
qtz vein stockwork i n argi l l i t e , about 100 f t above greenstone contact simi l a r t o 33878 rusty-weathered qtz vein stackwork i n a r g i l l i t e a r g i l l i t e with qtz vein stockwork qtz stockwork zonc i n argi l l i t e , rusty weathering argi ll i t e with qtz-vein stockwork, f l oa t black a r g i l l i t e with extensive qtz vein stockwork faulted a r g i l l i t e with Limestone, erg. Is., greenstone, and t u f f rusty-weathering black argi 11 ite, moderate qtz veining
rusty weathering a r g i l l i t e with qtz veins a r g i l l i t e u i t h planar and small folded q tz veins, rusty weathering rusty weathering a r g i l l i t e with qtz veins
Sample Twp(S1 R e Brief rock sample description
33891 20 4 11 4970 qtz veined a r g i l l i t e about 50 f t above greenstone unit
33892 20 4 11 4970 greenstone uith qtz veins at a r g i l l i t e contact 33893 20 4 11 4970 qtz-veined a r g i l l i t e
33894 20 4 11 5070 rusty-ueathering, qtz-veined black a r g i l l i t e
STREAM SEDIMENTS
PAN CONCENTRATES
Sec - 10 10 14 11 14 14 14 14
Elev - 4200 3750 3850 4620 3900 4370 4400 4150
Eiev - 3850 3750 4620 3900 4370 4400 4150 3900 4300 3950
ANALYTICAL PROCEDURES AND SAMPLE PREPARATION: ROCKS
. - - - - -. . - - - - -
ANALYTICAL PROCEDURES
CXOE / ~ ~ ~ . B s ~ I>HSCRI PTION M T H W LIMIT I. IMI T
Au ppb: Fur. 3 0 : ramplo W pprn: K pyrorulfata fusion A1 58: 32 alamont. roil & rock Ag ppm: 32 alamant. soil & rock Ar ppm: 32 alament. boil & rock Ba ppm: 32 element. roil (L roct Ba ppm: 32 clamant. coil & rock Bi ppm: 12 clamant. roil & rock
' Ca '70: 32 clamant. roil & rock. i cb ppm: 32 elomont. roil a rock Co ppm: 32 alamant. coil & rock Cr ppm: 32 clamant. coil & rock Cu pprn: 12 alamont. roil & rock Fa %I: 32 clamant. roil A rock Ga ppm: 12 clement. coil & rock Hg ppm: 32 clement. roil & rock K ?b: 32 clement. roil &' rock La ppm: 32 element. roil & roct Mg %: 32 element. soil & rock Mn ppm: 32 clement. coil & rock Mo ppm: 32 clcment., roil & rock NB %: J2 alemont. roil & rock Ni ppm: 32 clamant. roil & rock P ppm: 32 alamant. rail & rock Pb ppm: 32 olemant. toil & rock Sb ppm: 32 clamant. soil & rock
Sc ppm: 32 clamantr. roil & rock
i Sr ppm: 32 clement. soil & rock T i %: 32 clement. soil & rock TI ppm: 32 olamcnt, so11 & rock U ppm: 32 alamant, roil & rock V ppm: 12 clamant. toil & roct W ppm: 32 clement. roil & rock Zn ppm: 32 element. soil & rock
FA-AAS COLORIMETRIC ICP-AES ICP-AES ICP-AES ICP- AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-ABS ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP-AES ICP- AES ICP-AES ICP-AES
SAMPLE PREPARATION * m I : T h o 3 2 a l a r n o n t ICP p a c k a g e i r r u i t a b l o f o r t r a c e m e t a l s i n - r o i l a n d r o c k s a m p l e r .
onsur I 17 I ON E l e m o n r r f o r w h i c h t h a n i t r i c - a q u a r a g i a d l g a r t i o n I r p o r r i b l r i n c o m p l a t a a r c : A l . B a . Be. C a . C r . G I . K. L a . Mg. Na. S r . T i . T I . W.
ANALYTICAL PROCEDURES AND SAMPLE PREPARATION: STREAM SEDIMENTS AND PAN CONCENTRATES
ANALYTICAL PROCEDURES
A1 %: 32 element. roil & rock A# ppm: 32 elemont. roil & rock Ar ppm: 32 element. roil & rock Ba ppnr: 32 clement. roil & rock Ba ppm: 32 element. roil & rock
I Bi ppm: 32 element. roil & rock Ca %: 32 element. roil & rock Cd ppm: 32 element. roil & rock Co ppm: 32 clcmenh toil & rock Cr ppm: 32 element. roil & rock Cu ppm: 32 element. roil & rock Fa %: 32 element. roil & rock 0 a ppm: 32 elemmt. roil & rock Ha ppm: 32 elomrot. roil & rock K %: 32 elemroc. roil & rock La ppm: 32 elemmt. roil & rock Ma s: 32 elimani. roil & rock Mn ppm: 32 *lamant. roil & rock Mo ppm: 32 elemant. roil & rock Na %: 32 *lamant. roil & rock Ni ppm: 32 elament. roil & rock P ppm: 32 clemsnr. roil & rock Pb ppm: 32 elern*nt. roil & rock Sb ppm: 32 alernont. roil & rock
Sc ppm: 32 elementr. roil & rock Sr ppm: 32 clamrat. toil & rock Ti 5: 32 element. roil & rock Tl ppm: 32 element. toil & rock U ppm: 32 element. roil & rock V ppm: 32 olement. rot1 & rock
W ppm: 32 elsmeot. roil & rock Z n p e e s 32 elamenc. roil & rock W ppm: K pyrorullata lurion Au ppb: Fur* 30 8 rampia
SAMPLE PREPARATION
.- - ---- -- ---- I)BTKC7 1 ON 1lPPV.R
M m l l o ( 3 L lMl T L lMl T - -.
ICP-AES 0 . 0 1 1 5 . 0 0 ICP-AES 0 . 2 2 00 ICP-ABS 5 1 0 0 0 0 ICP-AES 10 I 0 0 0 0 ICP-AES 0 . 5 1 0 0 . 0 ICP-AES 2 1 0 0 0 0 ICP-AES 0.01 1 5 . 0 0 ICP-AES 0 . 5 LOO. 0 ICP-AES I 1 0 0 0 0 ICP-AES 1 1 0 0 0 0 ICP- AES I 10000 ICP-AES 0 .01 1 5 .OO ICP-ASS' 1 0 t O 0 0 0 ICP-AES 1 1 0 0 0 0 ICP-AES 0.01 10.00 ICP-AES 10 1 0 0 0 0 ICP-AES 0 . 0 1 1 5 . 0 0 ICP-AHS I , 1 0 0 0 0 ICP-AE$ I ' 1 0 0 0 0 1cP-A8a 0 . 0 1 . 5 . OCJ ICP-AES I I 0000 ICP-AeS 1 0 1 0 0 0 0 ICP-AES 2 10000 ICP-AES 5 1 0 0 0 0 ICP-AES I 1 0 0 0 0 0 ICP-AES I I0000 ICP-~es 0 .01 * 3 . 0 0 ICP-AES 10 1 0 0 0 0 ICP-AES 10 1 0 0 0 0 ICP-AES I LO000 ICP- AES 5 10000 ICP-AES 5 1 0 0 0 0
COLORIMETRIC 2 1 0 0 0 FA-AAS , 10000
Notr: Pan mn$ntrater were dried, weighed, ring pulverized and weened to -150 prior to Aqua regia
I
digestion.
I
I mwfm -It 1.-u
----.-
2 0 1 6 2 0 1 2 2 3 8 . 8
(Sf ream s edfntsflr3J) T h a 32 e l e m e n t ICP p a c k a s . i r r u i t a b l e l o r t r a c e m r t a l r i n r o i l a n d r o c k r u n p l e a .
. D E S ~ I P T ~ O N E l a m e n t r f o r w h i c h c h a n i t r i c - a q u a r e a i a d l a e r c i o n i a p o r r i h l v i a a o m p l e t e a r e : ~ l .
D C ~ . riav. -80 mark roil. 8.d. B a . B a . C a . C r . G a . K. L a . MI . N a , S r . T i . D R . aiavr -35 m*rh ria8 TI . \V.
ICP: qua resia disertion
