UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

Analytical resul ts and samle 1 ocal i ty map

of strearrsedimnt and heavymi neral -concentrate sampl es

frm the Circle quadrangle, Alaska

BY

R i chard M . 0 ' Leary , James D . Hoffman ,

Donald A. R i so l i , and Richard B. Tr ipp

Open-File Report 86-204

This repo r t i s prel iminary and has not been reviewed f o r conformity w i th U.S. Geological Survey edi t o r i a1 standards and s t r a t i graphic nomenclature. Any use o f t rade names i s f o r descr ip t i ve purposes on ly and does not imply endorsement by the USGS.

Page

Studies Related-to AMRAP .............................................. 1

Int roduct ion .......................................................... I ......................................................... Methods of ,Study. 3

Sample Media ......................................................... 3

Sample Collection .................................................... 3

......................................... Stream-sediment samples 3

............................... Heavy-mi neral -concentrate samples 3

Sample Preparation ................................................... 3

Sample Analysis ...................................................... 4

Spectrographic method ........................................... 4

Chemical methods ................................................ 4

Rock Analysis Storage System (RASS) ....................................... 4

................................................ Descript ion o f Data Tables 4

.......................................................... References Cited 5

IUUSTRATIOWS

.................. FIGURE 1. Location map o f the C i rc le quadrangle. Alaska 2

PLATE 1. Map-showing s i t es a t whlch stream-sedfment -and heavy- m i neral -concentrate sampl es were col 1 ected f ran the Ci r c l e ............................................ quadrangle. A1 aska .in pocket

TABLES

TABLE 1 . Limits o f determf nat ion f o r spectrographic analysis of ............................. stream sediments. based on a 10-mg sample 6

TABLE 2 . Chemical methods ............................................. 7

TABLE 3 . Analyses o f streantsediment samples from the C I rcle .................................................... quadrangle. Alaska 8

TABLE 4 . Analyses o f heavy-mineral-concentrate samles from the C i r c le quadrangle. Alaska ........................................... 68

The U.S. Geological Survey, i s required by the Alaskan National Interests Lands Conservation Act (Public Law 96-487, 1980). t o survey certaf n Federal lands t o determi ne t h e i r mineral values, if any. Results from the Alaskan Mineral Resource Assessment Program (AMRAP) must be made avaS lab le t o the pub1 i c and be submitted t o the President and the Congress. This report presents analyt ical resul ts of a geochemical survey of the Ci rc le quadrangle, A1 aska.

I MTROOUCT ION

I n 1979 and 1980, the U.S. Geological Survey conducted a reconnaissance geocherni ca l survey o f the Cf r c l e quadrangle, A1 askaZ

The C i r c le quadrangle cmprises about 6,090 m i (15,800 krn2) i n east- centra l Alaska, and l i e s about 47 m i (75 km) northeast of Fairbanks (see f i g u r e 1). Access t o the study area i s provided on the west by the Steese Highway. Access w i th in the Ci rc le quadrangle t o the sample s i tes was provided by hel icopter wi th the exception of a few s i t es tha t were accessible by vehic le from the Steese Highway.

The geology of the Ci rc le quadrangle i s d i vided f nto three general areas : the 1 argest i s a canplexly deformed, regional 1 y metamorphosed terrane o f mostly q u a r t z i t i c and p e l i t i c rocks south of the Tint ina fau l t zone: the second i s the area nor th of the Tintf na f a u l t zone which consists mostly o f fo lded Proterozoic(?) and(or) Paleozoic sedimentary rocks whi ch are s l i gh t ly metamorphosed. These sedimentary rocks are i n probable thrust contact wi th maf ic igneous rocks and associated chert o f l a t e Paleorojc and ear ly Mesozofc age. Minor c l a s t i c deposits o f probable Ter t iary age occur i n topographically - 1 ow areas north of the southern margin of the T i n t i na fau l t zone. The t h i r d area consists of the northwestern part of the quadrangle and i s comprised of . f 01 ded and s l i ght ly metamorphosed Precambrian(?) and(or) Pal eozof c scdlmentary rocks, Mesozoic c l a s t i c rocks, and t u f f s and tuffaceous sedimentary rocks o f Pal eozoi c and(or) Mesozoi c age.

The area -south of the Ti nt ina fau l t zone and the northwestern part o f the quad rang1 e are i ntruded by gran i t i c p l utons which post -date regi onal metamorphi sm and associated deformation. The in t rus ions are composite and dominantly o f peraluninous b i o t i t e granfte. A l l - th ree parts of the quadrangle have m i nor mafic 'and u l tramaf i c rocks. The u l tramaf i c rocks are mostly i n f a u l t contact w i th adjacent rocks.

The geologic se t t ing of the Circle quadrangle, especial ly where the post- orogeni c p l utons have intruded the regional l y metamorphosed rocks, i s favorable for t f n vef n/greisen. deposits, tungsten skarn deposits, lode gold deposits w i th associated placers, and urani um deposits hosted by peral umi nous granites.

The topography south of the T i n t i na f a u l t zone i s mostly low t o moderate mountainous r e l i e f w i th the average r e l i e f o f 2,000 f t (610 m) and a maximum elevat ion of 5,286 ft (1,612 m, Mt . Prindle). North o f the Tint ina f a u l t zone, the r e l f e f i s predanfnantly lowland marshes w i t h "islands" o f low r e l i e f mountains up t o maximum elevation of 3.728 f t (1,137 in, VABM craz, i n the Crazy Mountains).

Figure 1. Location map o f the Circle quadrangle, Alaska.

S a l e M i a

Analyses of the stream-sediment samples represent the chmi s t r y of the rock mater ial eroded from the drainage basi n upstream from each sample s i t e . Such information i s useful i n i den t i f y i ng those basins whf ch contain concentrations o f elements that may be related t o mineral deposits. Heavylmineral-concentrate samples provide information about the chemistry o f ce r ta in mf neral s i n rock material eroded from the drainage basin upstream from each sample si te. The select ive concentration of minerals, many of which may be ore-re1 ated, permits determination of some elements that are not, easi l y detected i n stream-sediment samples .

S a q l e Collection

Samples were col lected a t 861 s i t e s (plate 1). A t nearly a l l of those s i t e s , both a stream-sediment sampl e and a heavy-mineral -concentra e sample were collected. Sampl i ng density was about 1 sample s i t e per 6 m i f for the stream sediments and heavy-mine a1 conce trates. The area of the drainage 9 baslns sampled ranged f rm 2 m i 5 t o 8 m i .

The stream-sediment samples consisted o f active alluvium collected pr imari l y from f i rst-order (unbranched) and second-order (be1 ow the junct i on o f two f i rs t -order) streams as shown on USGS topographic maps (scale = 1:63,360). Each sample was composited from several l o c a l i t i e s w i t h i n an area that may extend as much as 20 ft from the s i t e p lot ted on the map.

Heavy-mineral -concentrate s;l es

Heavy+nineral -concentrate samples were col lected from the same ac t i ve - a1 luv f urn as the stream-sediment samples. Each bulk sample was screened w i th a '2.0-nm (10jnesh) screen t o remove the coarse material. The less than 2.0-mm f r a c t i o n was panned u n t i l most o f the quartz, feldspar, organic material, and c l ay-SS zed material were removed,

S a l e Preparation

The stream sediment samples were a i r dried, then sieved using 80 mesh (0.17 nm) stainless steel sieves. The port ion o f the sediment passing through the sieve was pulver i zed t o a t 1 east m i nus-100 mesh and saved f o r analysis.

A f te r a i r drying, brornoform (speci f ic gravi ty 2.8) was used t o remove the remaining quartz and feldspar from the heavy-mineral-concentrate samples t h a t had been panned Sn the f ie ld . The resul tant heavy mineral sample was separated i n t o three f ract ions using a large electromagnet ( i n t h i s case a modif ied Frantz Isodynamic Separator). ?he most magnetic material, .primarf l y magnetite, was not analyzed. The second fraction, 1 argely ferromagnesi an s i l i c a t e s and i r o n oxf des, was saved f o r archival storage. The th i rd f rac t ion ( the l eas t magnetic material which may f nclude the nonmagnetic ore minerals, zircon, sphene, ttc.) was s p l i t usi-ng a Jones sp l i t te r . b e s p l i t was hand- ground f o r spectrographic analysis; the other s p l i t was saved f o r mineralogical analysis . These magnetic separates are the same separates t h a t

would be produced by using a Frantz Isodynamfc Separator set a t a slope of 15' and a t i l t of 10' wi th a current of 0.1 ampere t o remove the magnetite and i lmenite, and a current of 1.0 ampere t o s p l i t the remainder of the sample i nto paramagnetic and nonmagnetic fractions.

Spectrographic method

The stream-sediment and heavy-mineral-concentrate samples were analyzed fo r 31 elements using a semiquantitative, direct-current arc emission spectrographic method (Grimes and Marranzino, 1968). The e l ernents analyzed and t h e i r lower l i m i t s of determination are l i s t e d i n Table 1. Spectrographic resu l t s were obtained by visual comparison of spectra derived from the sample against spectra obtained from standards made from pure 0x1 des and carbonates. Standard concentrations are geometrically spaced over any given order o f magnitude of concentration as follows: 100, 50, 20, 10, and so for th . Samples whose concentrations are estimated t o f a l l between those values are assigned values o f 70, 30, 15, and so forth. The precis ion of the ana ly t i ca l method i s approximately plus or minus one report ing in te rva l a t the 83 percent confidence 1 eve1 and plus or m i nus two report ing in te rva ls a t t h e 96 percent confidence level (Motooka and Grimes, 1976). Values determined for the major elements ( i ron, magnesium, calcium, and t i tanium) are given i n weight percent; a1 1 others are given i n parts per m i l l i o n (rntcrograrns/gram), Analyt ical data fo r samples from the Ci rc le quadrangle are l i s t e d 5n Tables 3 and 4.

Chmi cal Uet hods

Other methods of analysis used on stream-sedhi?nt samples from the C i r c le quadrangle are sumnarized i n Table 2. Analytical resul ts for the stream- sediment samples are l i s t e d i n Table 3.

ROCK ANALYSIS STORAGE: SY-

Upon completion o f a l l analy t fca l work, the analyt ical resu l ts were entered i n t o a computer-based f i l e cal led Rock Analysis Storage System (RASS) . This data base contains both descri p t f ve geologi cal information and ana ly t i ca l data. Any o r a1 1 o f t h i s information may be retr ieved and converted t o a binary form (STATPAC) for computerized s t a t i s t i c a l analysis o r pub1 i c a t i on (VanTrmp and M i esch , 1977).

OESCRIPTIOH OF DATA TABLES

Tables 3 and 4 l i s t the analyses fo r the samples o f stream sediment and heavy-mineral concentrate, respect i vely. For the two tables, the data are arranged so that column 1 contains the USGS-assigned sample numbers. These numbers correspond t o the numbers shown on the s i t e locat ion map (p late 11, however, the pre f ix " C I " and the su f f i x "s" or "cH were not included on t h e map. Columns i n which the element headf ngs show the l e t t e r "s" below the element symbol are emi ss i on spectrographic analyses ; "aa" indicates atomic absorption analyses: and "4 nst" indicates f luor imetr ic analyses. A l e t t e r "N" i n the tables indicates tha t a given element was looked for but not detected a t the lower l i m i t o f determination shown for that element i n Table 1. I f an

element was observed but was below the lowest report ing value, a "less than" symbol ( < ) was entered i n the tables i n f ront of the lower l i m i t of determination. If an element was observed but was above the highest reporting value, a "greater than" symbol (> ) was entered i n the tables i n f ront of the upper l i m i t of detenfnation. If an element was not looked for i n a sample, two dashes (--) are entered i n Tables 3 and 4 i n place o f an analytical value. Because o f the formatting used i n the computer program that produced Tables 3 and 4, some of the elements l i s t e d i n these tables (Fe, Mg, Ca, T i , Ag, and Be) carry one or more nonsignificant d i g i t s t o the r igh t of the s ign i f i can t d ig i ts . The analysts d id not de ten ine these elements t o the accuracy suggested by the extra zeros.

The spectrographic determinations for Au and Sb i n streamsediment samples were a1 1 below the lower l i m i t s o f determinations shown jn Table 1: consequently, the columns for these elements have been deleted from Table 3.

REFERENCES CITED

Centanni, F. Am: Ross, A. M., and DeSesa, M. A,, 1956, F luormetr ic determi n a t ~ o n o f uranium: Analytical Chemistry, v. 28, p. 1651.

Gri'mes, 0. J., and Marranzino, A. P., 1968, D i rect-current arc and a1 ternatjng-current spark emission spectrographic f j e ld methods for the semiquantitative analysis of geologic materi a1 s: U.S. Geological Survey Circular 591, 6 p,

Motooka, J. M., and Grimes, D. J., 1976, Analytical precision of one-sixth order semi quanti t a t i ve spectrographic analyses: U.S. Geological Survey Circular 738, 25 p.

Thompson, C, E., Nakagawa, H. M., and Van Sickle, G , He, 1968, Rapid analysis f o r gold Sn geologic materials, 5n Geological Survey research 1968: U.S. Geological Survey Professional ~ v e r 600-B, p. 6130-8132.

VanTrump, George, Jr,, and Miesch, A. T,, 1977, The U,S. Geologfcal Survey RASS-STATPAC system for management and s t a t i s t i c a l reduction o f geochemical data: Computers and Geosciences, v, 3, p. 475-488.

Ward, F. N., Nakagawa, H. M., Harms, T, F., and Van Sickle, G, He, 1969, Atmi c-absorpti on methods useful i n geochemi cat expl oratf on: U.S. GeologScal Survey Bu l l e t i n 1289, 45 p.

TABLE 1.--Limits of detednation for the spectrographic analysis of strear sediments, based on a 10-g sample

[The spectrographic 1 i m i t s of detenni nat t on for heavy-mi neral -concentrate samples are based on a 5 4 g sample, and are therefore two reporting in terva ls higher than the l imi ts given for stream sediments1

E l ements Lower detemi nation 1 i m i t Upper determf nat ion 1 i m i t

Percent

Iron (Fe) Magnesium (Mg) Calcium (Ca) i f tan i um (T i )

Parts per million

Manganese (Mn) S i 1 ver ( Ag) ArsenSc (As) Gold (Au) Boron (B) Barlum (Ba) Beryllium (Be) Bismuth ( B i ) Cadmium (Cd) Cobalt (Co) Chromlum (Cr) Copper (Cu) Lanthanm (La) Molybdenum (Mo) Nl obf un (Nb) Mckel ( N i ) Lead (Pb) Antimony ( Sb) Scandium (Sc) Tin (Sn) Strontium (Sr) Vanadjum ( V ) Tungsten (W) YttrSurn ( Y ) Zinc (Zn) Z i rconf urn ( Zr) Thorium (Th)

Table 2.--Chemical mthods

[AA = atomic absorption; and F = fluormetry1

Element or Determination limit constituent Samp 1 e Met hod (micrograms/ Analyst Reference determi ned TY pe gram or ppm) -

Gold (Au) stream sediments AA

Zinc ( t n ) do

Uranium (U) do

0.05 R. O'Leary Thompson A. Gruzensky and others,

1968.

5 d o Ward and others, 1969.

0.05 do Modif icat ion of Centanni and- others, 1956.

Table 3.--Anal yses of strearsediment sarples f r ~ r the Circle Quadrangle,Alaska I J!

IN, not detected; (, detected but below the l i d t of determination shmtn; ), deterrined t o be greater than the value shwn. I

Sample Latitude Longitude Fe-pct . Hg-ptt . Ca-pct. Ti-pct, Hn-ppn Q-ppr As-ppm B-ppr Ba-ppr Be-ppr 5 5 5 J 5 5 5 S 5 5

*. I Table 3.-Anal yses of strcam-sediment samples fror the Circle Euadrangle,ll aska--Continued

Sample

CIOObS CI007S Cf OOPS CIOOTS C10105

Table 3.-dnelyses of streer-sedirent samples fro0 the Circle Ruadrangle,blaska--Continued k a-

U-i nst

e 8 .5 .S .5 .b

.5 1.0 1.0 . 3

1.0

1.0 3e0

13.0 .5

2.0

e 7 .b .S .7 .b

1 .o .0

1.0 1.0 1.0

1.0 1*0

e b .9 * 3

.6

.e 1.0

.9 1.0

.7

.8 1 * o 1.0 , ?

1.0 2.0

.8 900

.9

Table 3.--bnalyses of stream-sediment samplss fron the Circle Puadrangle,Alaaka--Continued

Latitude Longitude Fe-prt. flg-pct. La-pct . Ti-pct . 5 5 5 5

Table 3.--Analyses of stream-sedirent samples f ror the Circle Ouadrangle, Alarka-3antinued v

Ni-ppm Pb-ppr Sc-ppr Sn-ppm 5 5 5 . 5

Table 3.--Analyses ~f stream-sediment sarpler from the Circle Quadrangle, Alaska--Continued

Sarple ST-ppr V-ppm B-ppr Y-ppm In-ppr lr-ppr Th-ppn bu-ppr In-ppr U-inst I 5 s 5 s s 5 aa aa

Table 3.--Analyses of strsu-scdiaent maples f r ~ the Circle Quadrangle,blaska--Continued

Latitude Longitude Fo-pct. Hg-pct . Ca-prt , Ti-pct . h-ppr 5 5 5 I 0

B-ppr k-ppa 5 5

Table 3. --Analyses of strerrsadinent samples froa the Circle Puadrangl~,Alaska-Continued f Y

Sarpl e

zoo W 20 100 N 20 100 N 20 150 N 30 150 n 20

T l l e 3.-dnelyses of s t r e a r w d i m t s a m p l ~ ~ from the Circle Puadranglc,llaska--Continuad

Latitude Longitude Fe-pct. Hg-pct. Ca-pct , Ti-pct. 5 J 5 S

Table 3,--Analyses of stream-sediment samples frar the Circle Puadrmgle,llaska--Continued J w

Sanple Bi-ppr Cd-ppr Co-ppr Cr-ppr Cu-ppr La-ppn 5 5 5 5 5 6

9 I Table 3.--Analyses of s t rearwdi rent samples fror the Circle Puadrangle,llaska--Continued

Sarp 1 e W-ppr Y-ppr Zn-ppn lr-ppr Th-ppr bu-ppr s 5 5 s 5 aa

Table 3.4nr lyses of stream-sediment samplas froa the Circle Puadrangle,Alaska-Continued

latitude Longitude Fe-pct , 5

.30

.30

.20 "SO -30

.30 "SO .20 .20 .30

Table 3, -dnalyses d rtrearwdimt samples froa the Circle Puadrsngle,Al aska--Conti nued

Sarple U-i nst

N 20 N 300 N N 75 N 30 N 300 M N 85 N 50 N 300 W N 140 N 'SO ti 500 N W 130 N 200 300 500 (10 W > 150

rr t Table 3.-dnalyses of stream-sediment sarples fro* the Cirtle Ouadrany le,Alaska--Continued

Sarpl e Latitude

65 33 18 65 34 4 65 34 58 65 16 43 65 16 1

65 15 45 65 16 12 b5 15 33 65 IS 48 65 17 11

65 17 32 65 14 31 65 13 0 b5 13 8 65 14 46

65 14 53 65 14 8 65 13 40 65 13 18 6514 3

65 1 1 31 65 12 49 65 14 39 65 10 34 65 9 9

65 0 38 65 5 55 65 1 54 65 0 18 65 1 15

65 2 26 65 5 9 65 3 11 65 5 46 65 8 20

65 8 45 65 4 50 65 4 9 65 3 23 65 0 23

65 0 16 65 1 12 65 121 65 1 1 1 65 4 42

Longitude

146 42 40 14b 40 5 146 30 9 146 3 54 146 2 0

146 1 45 145 59 38 145 58 39 145 56 27 145 53 58

145 SO 42 144 5 13 144 7 39 144 10 53 144 11 0

144 11 38 144 12 34 144 13 P 144 13 54 144 18 11

144 18 35 144 17 54 144 22 43 144 24 0 144 27 35

144 27 56 144 25 20 144 27 23 144 11 51 144 7 52

144 5 28 '144 3 47 144 9 44 144 11 44 144 B 29

144 1 24 144 14 50 144 20 17 144 23 52 144 18 33

144 23 48 144 28 51 144 32 9 144 32 29 144 39 51

Ba-ppm Be-PPR 5 5

Table 3.-Analyses of stream-sediaent samples fror the C i r c l e Buadrangle,Llaska--Continued I l+

Sample Bi-ppm Cd-ppn ED-ppm k - p p r Cu-ppa La-ppm no-ppr Wb-ppr Mi-ppm Pb-ppr Sc-ppr Sn-ppm 5 5 5 5 5 , s 5 5 5 I 5 . 9

Table 3. --Analyses af stream-wdirent sarples f ror the Circle Quadrangle,llaska-Continued

lr-ppm 5

bu-ppa aa

Sample

Table 3.--lkralyses of straaksedirent samples frw the Circle Ruadrangle,Alaska-Cantinued

Latitude L~ngi tude Fe-ptt. 9

ng-pct . 5

Table 3.-dnal yses af stream-sediment samples from the Circle Ouedrangle,hlaska--Continued

Sarple

Table 3.--Analyses of strearsediment suplw from the Cirtle Quadrangle,lllaska--Cantinued

Sample

Table 3.--Analyses of stream-sedirent sampler fror the Circle Puadrangle,Alaska--Continued

Latitude Longitude Sample

Table 3.-dnal yse5 of strcar-sediaent serples fror the Circle Puadrangle,ll aska--Continued 7 Y

Cu-ppa La-ppi 5 5

* r Table 3 .--Analyses of stream-sedirent sarples from the Circle Puadrangle,Alaska--Continued

Au-ppr ita

t f

Table 3.--llnal yser of stream-sediment saaples from the Circle Quadrangle,Alarka--Cont inued

Table 3,-dnal yses uf strearaediment urplcr f ror the Cirrle Ouadrangle,~loska--bnt inued i r

Sample Th-BPI k-ppr Xn-pp~ U-inst s aa aa

Table 3.-dnalyser ~f strearsedilent sarples fror the Circle Ouadrangle,BIaska--Continued

Saqle Latitude Longitude Fe-pct. Ng-pct. Ca-pct, 5 5 5

Table 3.--Anal y5e5 of stream-scdiaent sarples fron the Circle Puadrangle,Al arka--Cont inued

Sample no-ppr 5

Table 3.-Anal yses of stream-sediment riarples f ror the Circle Quadrangle,Alaska--Continued

Table 3.-dnal yses of strearsediront samples fror the Circle Quadrangle,Rl rska--Continued

Latitude

r Table 3.--Analyses of strear-sedimt samples f ron the Circ le Buadrangle,al aska--Continued

lo-ppr Nb-ppa Hi-ppr Pb-ppr - Sc-ppa Sn-ppr 9 5 5 5 5 5

Tnble 3.-Anal y ~ e s of ~tr~aa-sediment sarples f rol the Circle Nuadrangle,Alaska-Continued

Sarple Th-ppr bu-ppr In-ppr U-inst s aa aa

N 50 N N 30 N w 20 N N 'SO N n SO M

4

Table 3.-dnal y 5es of stream-sediment s a m p l ~ from the Circle Buadrangle,Alaska--Cantinued

Sample Latitude Longitude

Talc 3.--Analps pf streaa-sedirent samples from the Circle Puadrangle,Alarka--Contlnucd

N N 30 20 15 N N (20 20 tio 10 w N N SO 20 1s n M , (20 20 10 15 N N N SO 30 20 N

* Table 3.--Analyses of strean-sediment sarples from the Circle Quadrangle,Alaska--Continued

V-ppr W-ppr Y-ppr In-ppr 5 5 5 I

Table 3.-halyscs of stream-*diment ranpies from the Circle Puadrangle,Alaska--Cantinued

Latitude

65 42 29 65 45 47 65 40 29 b5 49 6 65 49 3b

65 45 32 65 41 22 65 36 14 65 34 46 65 33 48

65 33 13 65 31 45 65 31 56 65 32 20 65 38 30

65 37 25 65 41 20 65 36 25 65 37 36 65 37 45

65 38 49 65 40 14 65 40 24 b5 36 55 65 36 39

65 36 27 65 36 50 65 4b 55 65 47 22 65 47 8

65 44 52 65 45 0 65 43 28 65 43 1 65 42 56

bS 42 42 65 46 33 65 21 1 65 21 37 65 18 28

65 20 10 65 39 51 65 27 55 65 28 16 65 27 37

Langi tude

145 23 35 145 23 31 145 22 53 144 18 24 144 33 32

145 36 53 145 3b 59 145 12 1 145 43 28 145 42 57

145 44 11 145 43 15 145 42 16 145 43 40 145 40 15

145 47 0 145 40 43 144 42 41 144 46 18 144 48 36

144 54 37 144 57 55 144 58 59 144 58 22 144 58 27

145 6 2 145 b 22 144 23 13 144 25 32 144 26 22

144 36 50 144 37 38 144 42 43 144 42 29 144 49 31

141 40 57 144 32 52 144 41 54 144 40 20 144 47 29

144 45 45 144 36 45 145- 47 26 145 46 37 145 45 3

lfl-pc t . 5

, 20 .30 -30 .so .30

30 .30 .30 .20 30

.30

.so

.70

.70

.30

1.00 1.00

70 1.50 1.00

1.00 1.00 .70 .so

1.00

1.00 .70

2.00 .so

1.50

1.50 1.50 2.00

.70 1.00

* 70 1.50 .30

1.00 .70

.70 1.00 .70 .30 .70

Table 3. --Analyses of stream-sediment sorplcs from the Circle hadrmgle,Alaska--Continued 7 #

* t T l l e S.-dnalpes of strearsedirent samples fror the Circle Quadrnngle,blaska--Continued

Sample U-i nst

Table 3.-dnalytie~ of strear-sedimt rarples from t h ~ Circle Puadrangle,Rlaska--Eontinued t I

Latitude Sarpl t

* I

Table 3.-dnalyes of stream-sediwnt sarples from the Circle Buadrangle,Alaska--Continued

Sanpl e

Table 3.-dnal yses of stream-sediment samples from the Circle hadrangle,Ll aska-Continued

V-ppr W-ppm V-ppm ln-ppr 5 5 5 s

Sample

Table 3.-dnalyws of stream-sediment samples f TOR the Circle Puadrangle,Alaska--Cont inurd

Lat I tude Longitude Fe-pct. Hq-prt. Ca-pct. Ti-pct, nn-ppn 5 5 5 5 5

Table 3,--Analyses ~f s t r e a r s e d i r ~ t samples fror the Circle Puadrangle,Alaska--Continued t *

Table 3.--Analyses rtf strearsediment sarples from the Circ,le Ouadrangle,llaska--Continued

Sarple

Table J.-dnalyses of rtreamecliwnt samples froa the Circle Buadranglc,Alaska--Cmtinued I I

Latitude Longitude Fe-pct . Hg-pct . Co-prt. 5 S 5

? T

Table 3,--llnalyses of stream-sedirent lrsrples from the Circle Puadrangle,Alaska--Continued

Sample

Table 3.--l)nalyscs of strearredirent samples fror thc Circle flwdrmgle,Alaska--CPntinued I >

t * Table 3.-dnelyses of rtrear-srdirent supies frar the Circle Ouadrangle,l\leska--Cmtinued

Sample Latitude Lnngi tude

Table 3.--4nalyses of strearsediment rwples fror the Circle Puadrangle,Blaska--Continued t 1

Table 3. --Analyses of stream-sedirent samples f ron the Circle Ouadrangle,ll aska--Continued

Table S.--halyaes of strear-rtdilent sarplcr frol the Circle Ouadrurgle,llluka--Continued

Latitude L ~ n y i tude Fe-ptt. My-ptt, Ca-prt . Ti-pct. Hn-ppr Ag-ppr As-ppr 8-ppr 5 5 5 I I 5 5 5

1 v Table 3.--Analyses of stream-sedirent samples fro# the Circle Uuadrangle,Alaska--Continued

Sarple

Table 3. -4nal yses of stream-sediment swples f t ~ the Circle Puadrangle,blaska--Continued

Sarple

Table 3.-dnal y 5es of stream-sedirent saaples from the Circle Quadrangle,Alaska--Continued

Latitude Longitude Fe-pct. 5

Sample Bi-ppr 5

Table 3.--Analyses of strrar-sedirent sarpls fror the Circle Quadrangle,ll aska--Continued 'I f

Sarple

Table 3.-dnal ysei of stream-sediwnt sample5 f ?on the Circle Quadrangl e,lllaska--Cont inued

Table 4.--Analyses of h~avy-aineral-cmrentrate sarples from the Circle fluadrangle, Alaska t

IN, not detected; (, detected but below the lirit af determination shown; T, deterained to be greater than the value shown, 1

Sample

ClOOlC C1002C CI003C CIO04C Cl005C

CIOObC C10076 ClOOBC CI009C CIOlOC

Latitude

65 47 22 65 42 58 b5 41 30 65 37 57 65 37 8

bS 36 25 65 35 42 65 34 0 b5 33 22 b5 32 18

Longitude

144 S 0 144 17 0 144 23 31 144 27 10 144 29 13

144 35 21 144 42 12 144 52 57 144 47 46 144 45 43

15-ppm h-ppm 5 5

! I Table 4.--Analyses of heavy-ainwal-concentrate sarp lw frw the Circle Ruadrangle, Alaska--Continued

Table 4.--Analyses of heavy-r innal -concentrate saqlrs from thr Circle Puadrangle, A l aska--Continued 1 I

CIOOlC CI002C CI003C C1004C CIOOSC

t Table 4.-halyws of heavy-rinwrl-concentrate sarplcr f tar the Circle Uuadrangle, A1 aska--Continued

Latitude Lonpitude Fe-pct. fig-prt. Ca-pct. 5 5 5

Table 4. --Anal ysee of hervy-minwal -concentrate sanples f r ~ the Circle Quadrangle, A l aska--Cont inucd t s

Sample

t f Table 4.-dnalyscs pf heavyrineral-concentrate samples f ror the Circle luadrangle, Alaska--Continued

s * Table 4 , -dnalyses of heavy-inrral-concentrate samples from the Circle Quadrangle, Alaska-4~ntinued

Table 4. -4nalyses of heavy - h i n e r d <oncentrat@ sarplcs f rw the Circle Ouadrangle, A1 aska--Continued 1 .S

Table 4.--Analyses of heavy-minwal-concentrlte samples frw the Circle Quadrangle, Alaska--Continued r .S

Sample

1 I Table 4.-Analy~+e8 ~f heavy-inaal-concsntrate sarplrs fror the Circle Boadrangle, Alatika--Contintled

Sample

500 150 (100 ioo

N 100 (100 100

N 1 so

760 loo N 180 W I00 N 200 N 200

Table 4.-dnalyses ~f hravy+inwal-cancentrate samples froa the Circle Puadrangle, Ala~ko--Continu@d p

Saaple Latitude Longitude b-ppr lu-ppr 5 s

Table 4.-dnalpes of h e a v y ~ i n # a l - ~ a c e n t r a t r samples from the Circle Buadrangle, A1 aska--Continut4

Saaple

t Table 4.-dnalyses of heavylineral-concentrate r u p l e s from the Circle Buadrangle, Alaska--Continued

Sample Latitude L ~ n g i tude Fe-pct. Hq-pct . Ca-prt. T i -pet. Hn-ppm 5 5 5 5 5

Table 4.--Analyses of heavy-rinwal-roncentratt suples fror the Circle Buadrmgle, Alarka--Continued I t

l Table 4.--Analyses of heavy-rinwallcmcentrate sampler fro@ the Circle Ouadrangle, Alaska--Continued

V-ppr ln-ppr 5 5

Table 4.-dnalyses of heavy*insal-~oncentrate samples from the Circle Buadrangle, Alaska--Contirued * J

Latitude

65 1 11 b5 4 42 b5 2 36 65 2 15 b5 3 54

65 3 43 65 3 1 65 1 10 65 0 19 65 1 56

65 4 20 65 5 46 65 2 45 65 3 42 65 4 34

65 9 23 65 9 51 65 11 13 b5 8 32 65 5 46

65 7 53 65 7 18 65 1 37 b5 7 5 65 4 54

65 3 13 b5 3 21 65 3 21 65 3 31 65 3 35

65 1 36 65 1 7 b5 0 12 b5 0 14 A5 1 54

65 1 40 b5 7 37 b5 7 48 b5 b 1 4 65 6 3

b5 5 IS b5 5 26 b5 1 13 65 0 53 bS 0 48

-

1~ * Table 4.-dnalyscs of heavy-rinual-conrentrate samples fro8 the Circle Puadrangle, Alaska--Continued

Table 4.-dnrlyses of hcavy-rinwrl-cmtentrate suples fror the Circle Quadrangle, Alaska--Continued ' E

Table 4.--Analyses of hcavy-minwrl-~oncentrrte suples froa the Circle Puadranglr, Alaska--Cmtinued q P

Sample

$. v Table 4.-4nalps af heavylinwrl-concentratc sarplel frm the Circle Quadrangle, Alaska--Continued

lr-ppr 5

500 >2,000 1,000

300 500

900 700 150

2,000 )2,000

1,000 2,000

700 )2,000 2,000

2,000 >2,000 2,000

>2,000 )2,000

>2,000 )2,000 1,500 1,000 1,500

)2,000 >2,000 1,000

>2 000 700

200 200 100

1 ,m >2,M)O

>2,000 >2,000 )2,000 >2,000 )2,000

>2,000 >2,000 2,000

500 >2,000

Table 4 . 4 a l y s c s of heavylrinaal-concentrate sampler from the Cirrle Puadrangie, Alaska--Cmtinued E

Sample Latitude

1 t Table 4.--Analyses a4 hervy-rineral-rontentrate supler from the Circle Quadrangle, Alaska--Cmtinued

Sample

Table 4,--Anal yses of heavy-rinwal-concentrate samples f rw the Circle Wdrangle, blaska--Continued 3 I

Sarpl e

a- % Table 4.-Analyses of hwvy-rinetal-concentrate samples froa the Circle Buadrangle, Alaska--Continued

Latitude Lonqi tude

Table 4,--Analyses of heavy-min~al-c~ncentrate samples from the Circle Quadrangle, Alaska--Continued a I'

Sarple

C1409C GI410C CI4llC CI412C C1413C

CIlll4C CI415C CI416C C1417C C1418C

Be- p pr 5

3 5 7 3 3

2 5 3 7 2

t F Table 4.--Analyses of hcavy-rinwal-concentrate samples fron the Circle Quadrangle, Alaska--Continued

Sample

CI409C C14lOC CI411C C1412C CI413C

C1414C C1415C C1416C CI417C C141BC

CJ419C CI420C CI421C C1422C CI423C

C1424C C1425C CI426C CI427C C1428C

CI429C CI 430C C1431C CI432C CI433C

C1434C CI435C Cl43bC C1437C CI438C

C1439C CI44OC CI441C C1442C C1443C

C1444C Cf 445C C144bC C1447C CI448C

C1449C CI450C C1451E C1452C CI453C

lr-ppm 5

i2 + 000 2,000 )2,000 2,000 >2,000

)2,000 1,500 )2,000 2,000 i2,OOO

2,000 2,000 2,000 2,000 700

>2,000 >2,000 >2,000 2,000 2,000

)2,000 1,000 700

2,900 700

500 2,000 2,000 500 700

1,000 1,000 i2,000

700 1,000

1,500 700

1,000 500

1,000

500 1,000 )2,000

500 1,000

Table 4.--Analyses uf heavy*inwal*mcentrate saaples frar the Circle Quadrangle, Alaska--Continued I

Sarpl e Latitude Longitude bu-ppr 5

n W H N N

N M N I N

N N N N N

N W N N N

c t Table 4.-dnalyres ~f heavylrinwal-concenttate samples from the Circle Buadrangle, Alaska--Continued

Bi -ppm Cd-ppr to-ppr Cr -ppr Cu-ppr 5 5 5 5 5

Table I,-dnalyses of heavy-rinwal-cmcentrate sarpln from the Circle Buadrngle, Alaska--Continued I

Sarple

Table 4.--Analyses of heavy-ninnai -contentrate samples frw the Circle Puadrmgle, Alaska--Continued t .I

Table 4,--Analyses of hcavy-minwal-cmcentrate sarplcr f ror the Circle Purdtangle, Alaska--Continued

Sarpl e

Table 4.-dnaly~r of heavy-minsral-c~ceRtrate sampls frm the Circle Puadranglr, Alaska--Continued ' .J

Sample Latitude Longitude Fc-pct. Ng-pct. Ca-pct. Ti-prt. h-ppa 5 5 b S I

% • Table 4.-4nalyses of heavy-rinwal -concentrate saaples f tor the Circle Quadrangle, Ill aska--Continued

Sample

100 N 200 100 N ZOO

1,000 n 1 00 200 N 150 300 P SO

m Table 4.--Analyses of heavy-minwal-cmentrate sarples fror the Circle Uuadrangle, Alaska--Continued

Sample

CI592C CI593C C1594C CI595C CI596C

C1597C ' C1598C CI599C CIbOOC C1602C

CILOX CI 604C C1605C CIbObC C1607C

CICOBC CIbWC CIblOC CIbllC CI612C

C1613C CIbl4C CIb15C CIbl bC C1617C

CIblaC Cl LZOC C162lC Clb22C CIb24C

CI 625C CI627C C1628C CI 629C CIb30C

Cl632C CI 633C CI b34C Clb35C CI 636C

Cl b37C CI638C CI639C CI b4oC C1641C

Lati tudr

65 20 16 65 27 37 65 25 49 65 25 45 65 27 20

65 28 1 65 24 55 65 24 35 65 24 24 65 42 39

65 49 53 65 30 35 65 34 46 65 $4 35 65 34 51

65 33 20 65 34 8 65 35 7 65 37 45 65 37 13

65 36 53 bS 36 7 65 38 14 65 39 7 65 42 20

65 42 6 65 42 53 65 53 53 65 49 41 bS 48 37

65 40 30 b5 49 11 65 48 52 b5 46 25 65 47 18

65 3b 7 65 35 53 65 36 50 b5 37 22 bS 39 23

b5 37 30 65 30 5 65 37 52 65 37 48 65 41 12

Table 4. --Analyses of heavytineral-c~ncmtreta samples f ram the Circle hadrang1 e, Alaska-Xmti wed • p

t Table 4.--Analyses af heavy-rinsal<oncentrate saaples f r ~ the Circle Buadrangle, Alaska--Continued

Sarpl e 1 r-ppr 5

CIbOBC CI b09C CIblOC Clbl lC CIL12C

CIbl8C CI b20C cr bzic El b22C C I b24C

Table 4.--Analyses of heavy-rineral-concentrate samples fro# the Circle Puadrangle, Alaska--Continued B I

Sarple

C1642C CI b43C CI644C C1645C Cl646C

CIL4X CI64BC CI b49C CIbS1 C CI b52C

CIb53C CI 654C CI 65% CI65bC C1657C

Cf 6% C1659C ClbbOC Clb61C CIbb2C

Cibb3C CI664C CI665C CI66bC CIbbfC

CI bb8C CIbb9C

- CI670C CI671C CI672C

CI 673C CI674C CI 675C CIb7bC C1b77E

C 1678C Clb7PC CIbaOC ClbBlC CIb82C

CI6WC CIb04C dr best Clb8bC C1687C

latitude Lungitude Fe-prt. 5

Tablc 4.--Analyses of heavy-rinwal-cmcentrate samples frar the Circle Buadrangle, Alaska--Continued

Clbb8C CI bb9C GIMOC CIb71C CIb72C

Table 4.-dnal yses of heavy-inwal-cmcentrate sampler fror the Circle hatangle, Alaska--Continued . '

Sample

Table 4.--!malybcs of heavy-rinwal-concentrate sarples from the Circle Buadrugle, A1 aska--Continued

Samp 1 e

Cl bBBC CIbi9C CI690C CI691C C1692C

C1693C C 1 b 9 C CIC95C CI69bC C1697C

C I69BC Cl b99C C1700C CI701C C1702C

CI703C CI7MC CI705C CI706C CI707C

CI708C C1709C CI710C C1711C CI712C

CI713C CI714C ~ 1 7 1 5 ~ CI7lbC CI717C

C171BC C1719C C1720C CI721C CI722C

CI723C CI724C C1725C Cf 726C C1720C

C1729C CI730C G1731C C1732C CI733C

Sr-ppr V-ppr W - P P ~ 5 5 s

lr-ppr 5

Table 4.--Analyses uf hravy-rinwal-cmcentrat~ rwple~ fror the Circle Ouadrangle, Blaska--Continued * - '

Latitude Longitude Fe-prt. 5

b-ppr hu-ppn I 5

* A Table 4. -4nalyses of heavyrinwalrmcentrote rarples f tor the Circle luadrangle, A1 aska--Continued

Table 4.-dnalps of heavy~incral-concentrate samples fram the Circle Ourdrangle, Alaska--Conti nued * . 'C

Tale 4.-dnalyses d heavy-rinmal-cmtmtrate u r p l e s f r ~ the Circ le Puadrangie, Illaska--Continued

Latitude Longitude Fe-pct . Hg-pct . Ca-pct. T i -pet. Iln-ppm Lg-ppr S s 5 5 5 s

Table 4. --Analyses of hravyrinwal-c~ncentratr sarples from the Circle Ouadrangle, dl aska--C~ntinud

Sample

CI7B2C C I703C C1704C CI785C CI7BbC

C1787C CI708C CI783G CI790C C1791C

C 1792C CI793C C1794C CS795C Cf 79bC

C1798C CI799C C I aooc C1001C C I002C

CIB03C CIB04C CI eosc claoM: C1007C

CI808C CI009C c18iod Cl01lC CJ012C

ClB13C CI814C C101SC CI81CC CIBf 7C

CIBt%C CI019C CIa2OC CI821C C1022C

C1823C CI824C CIB25C CI82bC CI029C

Table 4 . 4 a l yses of heavy-inwal-cmcmtratt samples from the Circle Quadrangle, Alaska-4mt inud .r

Sample Latitude Longi tudr Fe-pct . Hg-pct. I 5

-%- ,* Table 4 . - d n r l y n s of heavy-rinwal-concentrate suplas from the Circle Quadrangle, Alaska--Continued

Sample

Table 4,--Analyses of heavy-minwal-c~ncentrate samples f rm the Circle Uuadrangle, Alaska--Continued G =+@

lr-ppr Th-ppr 5 S