docs.azgs.az.govdocs.azgs.az.gov/SpecColl/2008-01/2008-01-0463.pdf · .F, PHOHE CODE GO2 9~;-4731 EXKCUTWK OI'FKCEB 1270 AVENUE OF TtlE AMERICAS NID, V YORK. N.Y. 10020 PLAZA 7-9700

The following file is part of the

James Doyle Sell Mining Collection

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CONTACT INFORMATION Mining Records Curator

Arizona Geological Survey 416 W. Congress St., Suite 100

Tucson, Arizona 85701 520-770-3500

http://www.azgs.az.gov [email protected]

.F, PHOHE CODE GO2

9~;-4731

EXKCUTWK OI'FKCEB 1 2 7 0 AVENUE OF TtlE AMERICAS NID, V YORK. N.Y. 1 0 0 2 0

PLAZA 7-9700

L ~-" &tY ~2 V,/.,, ~ . ,.,,,,,.~ "¢.~, E X P L O R M T I [D N , I N C . • SUBSIDIARY OF AMERICAN METAL CLIMAX, INC.

2510 N . CAt,~PDEL[. AVE., TUCSON, ARIZONA 8571g

March 20, 1970

Mr. Rodney DeVilliers DeVilliers Nuclear Corporation 457-B Washington St., S.E. Albuquerque, New Mexico 87108

Re: Edwards Claim Group, Pimal County, Ariz.

Dear Rodney:

The following are the geochem analyses which we made on the bottom of the Edwards' drill core:

PPM Sample No. Cu Mo Pb Au A n

TE 662 70 -I -I0 -0.I -I TE 663 120 7 I0 -0.i -I TE 664 995 ~ 4 20 -0.1 -i

The (-) sign reads: less than. 1P~ = .0001 percent.

\ \

CPM:mg

Sincerely,

Charles P. Miller

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S T R U C T U R A L CONTOUR MAP OF T H E B A S E OF THE H E L M E T

.OMERATE, RUBY STAR RANCH AREA,PIMA COUNTY, ARIZONA /

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i l ~ EXPLANATION.

~3100 CONTOUR LINES WlTN EL..~VATIQNI ABOVE SEA LEVEL (0A•HED WHERE 'NEERRED )

c ~ SECTION CORNE~! PLUS SEe'irON NUMBERS

i l l I DRILL HOLE LOCATION t l T N DEPTH TO HELMET FANOLOMERATI. r , NEGATIVE NUMBERS i o o @ INDrCATI[ THAT THE FANOLOMERATE BASE iB BELOW ~EPTH OF 0RtLL HOL~

0--~ TM H[LINET FANOL~MERATE $ ABSENT IM ORILL HOLES

OUTGRO~ OF ROCKS OLDER THAB HELMET FANOLOMERATE

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to accompany Report by K~.:nyun R;chard dcn~ory 1909

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"~-" SAN XAVIER FAULT

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EDWARDS PROSPECT

Twin Buttes -. P i m a D i s t r i c t

A r i z o n c z

to e¢company Report bv K:,:ny,~n Richard ,Jcnugry 1969

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~ELEPHONE AREA CODE ¢02

" i 795 -~73 |

\ EXECUTIVE OFFICE:S 1270 AVENUE OF THE A~ERICAS, NEW YORK, H.Y. 10020

PLATA 7-g7OO

SUBSIDIARY OF AMERICAN METAL CLIMAX, INC.

2 ~ I 0 N. C A t C t P B E L L .AVE., T U C S O N , A R I Z O N A 8 5 7 1 g

March 20, 1970

Mr. Rodney DeVilliers DeVilliers Nuclear Corporation 457-B Washington St., S.Eo Albuquerque, New Mexico 87108

\

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Re: Edwards Claim Group, Pimal County~ Arizo

Dear Rodney:

The following are the geoehem analyses which we made on the bottom of the Edwards' drill core:

\

PPM Sa~le No. Cu Mo Pb Au A_i__ -

TE 662 70 -I -I0 -0.I -I TE 663 120 7 I0 -0.I -I TE 664 995 4 20 -0o1. -i

The (-) sign reads: less than. I PPM = °0001 percent.

CPM:mg

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Sincere ly,

Charles P, Miller

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January lo~ .L96~

Edwa~,ds "'" o "'-~'

Dea~ ~-. :

The m~,~s and sections ' ' ' -. ~ watch I displayed ~-~d described d~ri~s6~.

.

youi ~ Dec~,.o~r ex~loration meeti~g accompany ~bi~ pepo~t. The

sections have been r~,~uc~d in scale

The ~ ~,~l~ ,, *~, ~ ~ ! • ' ' ~ ~ ray ~ncerta~.ntles which I corm~ented u o o n .,.~,~

letter of .... " ' august 22 are now fairly well resolved It seems :

reasonably certain that a new and separate center of mlnera!iza-

t i o n exists beneath the f].at, post°-mine ~ San Xavie~ ~ fau!~, i n

tae area between "~'~'~,,-,.,., Twin Bubte~ and Pima-.i;ission o r e bodies~

This new zone should h a v e major dimensions.

tn~ last meeting the locations of a su~p . . . . ~-no

number of additional drillho!es have been de ~ " e~ te~mln.~o These a r e

labelled as "n~?~ ~' drillholes on the accompanying 500-sca!e map.

~[ost of these wePe drilled by Anaconda ,~ithin the east 3 yea.rs~

Bot.h tne pattern ana the nu~,foer, of ~n~conda drillhoies are

informative~ even though we 4.0 not have their, re.sults., i would

~udge they have not drilled enough, holes either to have measured

~h or delimited an ore body, Tile inference, however, is :'clear u...at

the:y have obtained ore~grade intercepts in praoticail7 all drill..

holms in the south half of' section 19,. '/-here is no other reason/

~ ~ * b "~" pattern ~Jble explanation for that marry dri!~ao~es with ~.~,. °

The majo~ ~ ore bodies in the district vary from one to over

two miles in ~ongtho Assuming the6 Anaconda Is "inferred '~ now

ore body wi.ll }lave a similar size, there is good reason to expect

that subso ntlal portions of it will be found on the Ed:'~ards

Claims to the N~ as ~vell as to the LToo of the presently kno;';n

cluster of holes.

Since it is anticipated that ore occurs only beneath the

San Xavier fault s depths to the top of any ore within the clairas

E° of the T;;in. Buttes high:Jay should range within 500'-to 2000'..

The implication in this iss of course, that any ore body found

would be susceptible only to tu~derground •cave running.

The data at hand for some of the older drillholes consist

only of a few assay-averages. But those geologic logs which I

do have indicate that for ~00' or so below the San Xavier fault

the ralneralizati6n occurs in tactite (mineralized Paleozoic llme-

stone) and Tertiary porphyry'. Some intercepts of mineralized

igneous rock probably are Precambrian granite, it is to be ex-

pected that any ore in the Edwards claims will occur in tactite

£o~ the first few hundred feet below the fault. At greater

depths all mineralization should be in granite and po~p~y~ ~ ~y,"

and~ most Importanly~ mineralization should continue more-o"-

less indefinitely in depth. - .

If the tactite mineralization bcneath the San Xavier fault

is llko that in the ~.qisslon-Pima zone, and it should bo, the

chalcopyrite will have spotty distribution° 2.n ore bod~: of that

type actually consists of a largo number of small Icnses of bettor-

g~ado ore separated by about oqu~J~! tonnages o£ vmstoo By sclectlvo

" shovel miniqg the @:,ductlon gz, ado~ at ~issi@ in tactito ~hall

the ore is .in lower grad.e argillite) are maintained at ~7 to 1.O

Cu. This same mass of roc]~ would have a production grade of

about .6 Cu by cave mining, and that is what we would by looking

for with the proposed drillholeso

If, as expectcd~ mineralization continues in depth i.nto the

porphyry and.granite zone, the copper there should be distributed

more uniformly than in tactite.

Briefly, thel~o is a moderately good chance to find a large

termage, low grade, cave-mining ore body on the subject property

east of the highway.

Anaconda probably has enough deep~ underground-mining ore

both at ~Jin Buttes and an this inferred "new" ore body of theirs

to last practically" indefinitely without need for any additional

ore on the Edwards property. There is no reason for acquisition

of this property in order to wait for An@conda to require it.

Three drillh$1es sho~ on the 500-scale map are proposed as

a worthwhile, minimum, preliminary exploration program to test . °

the Edwards claims. Estimated drillhole depths are as follows:

1

2

3

Depth fo Fault

©

Total Depth if Unmineralized

900 1300

1 4 0 0 ' 1 s e e

2000 2400

Total Depth if 14ineralized

3 . 9 0 0

2400

3000

V300

3

J

@ The holes should be drilled by rotary th~

11elm~ ~ fahglomorate u~ti! the fault is crossed

• O u g h alluvium and

Spot corn-runs

~,.~.thout casing should be made at i00' intervals bcgin]~ing about

300~ above the expected depths to the faulto Rotary cut ~''*'~,~.~,~

will have to be observed continuously°

soon as the fault has been po2uot~atedo

Casing should bo sot as

Thereafter, drilling

should be by wire-line coring with emphasis on core rocoveryo

T]ie contract should specify a stiff pe~]alty for each core-run be-

low 60% recovery and, in effect, a good bonus for more than 80~'~

~ecoveryo This poln~ is made here because poor core ~recovery can

result in an uncertainty of .2, up or down, in the average Cu per-

centage. ~ That degree of unccrtainty would wipe out the usefulness

of' an entire drillholeo The contractor can be infolmed that rock

drilling condition~ shot{ld be similar to those of the 1.~Ission

zone and also, I would think, of the ~h-;in Buttes zone.

The entire cost of this preliminary program, including drill-

lug contract, sar'nple handling, logging and supervision, should

approximate ~120,000o

If any one of these holes gives indication of ore grade and

thickness, an trore body measurement" program then ~';ould cost i~om

Se to 4 millionJ

The property boundaries and ownership shown on the 500'scale

map have not been checked.

handed to me by Edwards.

They wel~e derived only from material

.~aconda has not drilled for several months in the area east

of the ~'lln Buttes-San Xavier hiEhway, bu~ during that tlmo they

i ̧

.1

have drilled at least a couple of holes, and probably more~ to

the west of the highway° This westerly area involves the Con-

tinental I~{ine in the area of drillholes T31, T52, etc~ on the

500-scale map. This was a recent co~mercial fiasco. The property

is now owned by Anacor~d~. The point is, the Continental zone

(mineralized but not an ore body) can be accounted for only by

selecting one of several structural interpretations~ all of which

are quite awkard. I have always considered that this mineralized

block was in the hangingwall of the San Xavier fault. Possibly a

better interpretation now is that some mineralized areas exist

beneath the fault, and Anaconda has been investigating leads of

that kind with their latest drillholes.

After trying without success to spot Anacondals "new" drill-

holes from the air, I hired Vern DeRuyter, a graduate U. of' A.

geology student with a built-in excuse for climbing fences into

Anaconda ground~ "just looking for a thesis area." Surprisingly~

Anaconda security guards chased DeRuyter around and made quite an

effort to learn who he was really working for. So, I stopped the

work before he had checked the area west of the T~vin Buttes-San

Xavier hAghway.

The thing about all this is that Anaconda's activity west

of the highway is probably more than just claim assessment work,

and the Edwards claims in that area may have more value than

I had formerly thought.

• @

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Although it is hardly ncc~ssary~ I would like to er.?haslze

tha$ the information on section A-A ~ should not be allowed to

get outslde of your or~anizatlono

$ o J

very truly~ ~. "

,

Kenyon Richard

i.' .-

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Atts~

One-Plan ,..=p;'~ •

One Plan ?~ap

One Se or!on

One Shee$ of ~ Sections

: I" =500~

l~ = I mile a .

i" = 20001

I" = 2000~

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F r , £ L ~ , ; I n A R Y CALCULATi0)/S OF ~a ' , D . , ,A .~ I J . I~ CLAI'""

pilL& COUNTY, A]{IZO~:A

Introduction

The Dynamite claim group lies approxirmtc!y twcnty-five m!lc:~ souDh-soutbz::ost of Tucaon~ Arlzonu~ in the Piton k'inin S • ,-.~, ~ ,r,;, six unpatentcd "" ..... (l~[S ua . ~ ,~ , u, . . . . C lana,,.ito clai:;is are located in t h s :1 . . . . . ' " ~ Ro 1 3 E o ~ anti" are o ~ . ' ' e . . . . : . °..~ ,,~ V o s e e . 30~ T . 2 7 S + , . . _ , . , . , , . - .

in a ~ , o I u~..-~oud~ direction° Tflcy embrace an area 1500 feet by 3600 f o o t , and occupy approximately 125 ac~,as.

The blacktopoed Twin Buttcs Road aporoxi:~a ~-~" t ) : o • " ~ --,

boundai-y of t h e claim F;roup, and t / ~ .e maintained, dirt ~.,,~.<'",:~-'~,~ta.. Road traverses eastward thi~ough t h e center of tl-a acreage°

Vhile thn claims w e r e xn%dom option to Anaconda a tot~al . . . . . . . . t . . . . . . . o }'.oie ~ of 9~381 feet "::as drilled in six ~ ' ~ , ' " o Five of "~ ' -~

contained v,'611 nlinerailzod intorcopto~ and the sizSh hole wa:p essentially barren of copper mineralization°

'..:ethod of Attack

The calculations of this study are based on five u~ids- spaced d ~,< ~ holes A-979~ a,e-A, A_973 A-969 and '~ ~'~c Drill hole A-970 contained less copper values and v ; a s not considered in ~e calcul~tiOnSo The spacing of the drill holes ranzos from 900 feet to 925 foot.

Areas of influence yore calculated by the polygonal method, and where there x:asn~t any drill ho!a bo'o~Idin;Z the polyF.,on~ the ~.~or~ image of the controlled half of else ~Doly" son was projected. ~e polygons %'e9o constructed a r o ~ u - l d the respective drill holes on graph paper, and t h e square foota~.e of Influence was measured "[:y co'~ultins the number of sq~.~res in the polygon and r, mltiplying the nttmbcr by a constant.

To allow for easier calculations a fi£,~n~e of l0 F~oS/ton 2.~.e SPeCifiC . . . . . ' '~ • c~;~/ of tko ~cl.: conta4.ning the

~ulfido ~Ino~,~alization is about 5. This &"ives a value of !0o~ ~. °ton. ~hus uh~ estimated tor.m.-e derived in ~O study is very close to the actual tonnage figures°

.~. . . . . . . , o _ , , D~enum val _ s In drill hole A - 9 7 9 " , : : o r e

ropo~4&odo In this hole only a Cu--.~,b equiva!ont was derived. Tim fo ...... a used in this dorivazion is )~(Lb b) 4. Cu )o ~,~o

oqulvalent. 'i'his conversion allows for a total tonnage in Cu % ~;hilo still g~t ~ " u~.n~, t l l o benefit of in@ ~.~o a s < ' ~ ' ~

°

7~ I t v : . ,~s asslz:.ned f o r ~~ . . . . " . . . . . . . . . . . ~ = ' P " '

Z'P,,S ~C, li:r.i ~'" . . . . ~ " ~ v . a 2 o a d u . o tO OV:.~c2g,%ID o O ~ J & l a a I ' s r l* . . . . .

it muaV leo borne in mind ~&:at tnia study is of the :'apid pz,e- limlnary charactep~ and time did not ciicv, for double chccicimg of the fiis"u~es~ vt is ~ " ~ " "*~ . . . . ~": . . . . . . .

are fa ~.~_~ accurate and closely atmmoxl;::ato.. "&'no tr'~<~ values.

.I i

"~ . . . . ",- of t h e c a ! c , l . , ~ , a . o . ~ o . e o . . . . - , ~ , ~ " . , A b r e a k ~ , . . . . ~ "~ : " ~ ' " - " p . . . . . c n ~ , ~ , a -n" a o o o n d i x

A. These ton:~gos and srados wore dcrlved from the assay data ° o . 4 i b n b .T trio A r i a conga Co.. ,~ . . . . . . ,., o " : ~ - " ; . - ~ supplied to "'- Vernon " " " " "

over 1 ~ Cu was taken than In the intervening L~itorccpts.

In the. five v.ido seated. ~.~.~;-~.---s a total of 30~ 136, 190 Cf

tona of 1o225 ,o Cu occurs as ind!catcd orc~ ace a ~-~.tal of" ~g

99, 814, 280 to~ or 0 ° 5 3 9 ,o Cu. occ,ca-s aa l.nd~cat~o~ ore.

~A very brief survey of the core in ~.h'o V. Smi~:'s po~sos- slon indicates that :alnoralization consists of d~alcocite, malachlt~, azurlte, r~,o copper, e!-ml - "~ donlte and very .minor amo~mts of sphn!orite and galena° This mineralization ocmrer: in altered liz,',os$onos and .~"-~ of t.*~ t.~plcal contact-meta-zo.aatie tTpe, T'u.~ limestone u.nits are altered to garnet, wollastoni~o, trc'molitc and other calo- silicate .minerals. ..~nor v~inlcts of ~ps~.~ ~,~c obsc~vedo

TY~ de.o~, of the ore varies f~om > ~ ~ ~ ..,- ..... o_,. vo hole, e..ccpt between A-9o9 and A-973 v;hcro it averages 926 foot below the surface bert:can th.~ two holes, in drill ho!o k-971b, located in the extreme southwest corner of the clai::: g:~oup, ths o:.c

. , , n ~ c . . . a . comes i n g:t 3 7 ~ b feet a n d ma ~ ' ' ~ . . . . . . . . . . . . .

grade of l.O1 ~.;; Cu to 5il feet, O z ' o E~ado mauerial over I /a Cu occua*s at various depths in the remaining tv:o holes, ~d correlations of the ore grade intercepts v:ith any dcgree of confidcnca is A.~-~ .. ~ I cult o

, , , i n e . . . . i " ' ~ ' ' I~ ..... eazatcl Z South of ~':" o . ,-~

A hole !coated lO00 fcct south of t h o south end bom"Za=}- o f the l>j ....... ire group Lutorscctcd ~-o follo'<ins ca~e g~aae mineralization in a tactite-ho>nfola :~,,-~t rock.

~ : ' , , ~ 1 0 3 o 1 0 o O

702.~ 830,8 176 .)! . 0 o7 k 702 °I~ .} t. 72"~ 2 0 ~,.° 0~8i 71:2.2 3o5o5 63,,_3 1.03 855°8 eS.o 1,4.4 U , ~ k . ; ~ ~

I

I

" : - ' ~ ' ~ . ~ ' ; - . ~ t i o n consisted ^*" ~ . p,Tri . . . . " donIZo, bornito a l l i pri;~'~z'?F cnalcocltc.

r J ~

Three holes v,'cro drilled on >O,o Coot . . . . :, ..... hole mcntlonod above ' " ' ~ S O 0 ~ " ~ n . ~ hole l'oe~ south ~d 5 foot of

~ ' - ~,,= ,,~- 3 2 9 , ~ ' c o t . T h e ~ ~ " ' " ~ ; 0 - 0 pO0 ~ . . . . . . . " . ~ c e ~ of the o r e h o l e . . . . ' w . . . . , . . . . ,Io5. fact 0°75 Cu in ~ , , , c , . , ~ , . , e , -"- .c,~-, .~. ,- , - , . -~.~ ~t a d e o t : . h , o: ~1-5.> fce ~; ~i~.e" ~ z n e ' " nolo" 500 foot to ' d ~ e east of the oz'o hole h r d . . . . . . ,,..,.riO... Ctt "t'tllV.eS Based on the center hole and tl~c !~olo to th~ west an csti:::atod 5o5 million tons of 0.80 % Cu Is ,indicatcd.

uusea on drilling ~-'~'~,, ...... 4"~"~" in ~~- ,~"":~ of i>ynamitc claims~ it is thooa~iscd ' - ' " ~ " ' " b / .~ t ~ 7./10 "Dill_riO " ~ . 4 : .... ~zod zt.~e . ~ , ~ o u . . . d ~ , ~ ' ~ e r o u , q h ] y } f . . 0 o . ~ 0 o v.. -- . and d±o l-O u :r-- 2 ' : ~ e r a i n - cr'allzcd zone ~:'ouid th'qa pz-oJcct acx~oss ~ho -'k~cas grour~t and into the ~ . . . . . " " ~ ~j..~n.~ te olaxm.a

Conclus, ,--

Tor.nnne and ,3~ade ccicula ""-~ :~o~ L, ba~ed in trois re'- are on ~,ide sooted-drill hole • ~- ~ ..... ~n~e~.~so Also hicr! grade _n ~" ~- c c p t . a _ . ~ ' : c r c c ~ - , ~ ~ ~ . , ~ ~ b o t , , v o o n ~ '~o- w i d 0 - s p ~ c o d q o l e s " ~, ' i ~L,' ~,,-~-_.,. ~.

• am:uorous to ~o.~lat~ ., ~ o ~ . . . . ; u ~ u line or ro£.-alaz- ~nuuz',,octlons ,.'.hich do not llc on a s ....... " --'-~ curve Only " ' - " ~ "~ ~ ~ ~ .~ . . . . . . . lll~ ~uIl~i ~ clo~o~ ~ D ~ C O ~ ~'~" " c.~.,l will conli~- o r .

dlsprovc the dorlvatlons contained in this rcporto

°

S/_~.iehard i{~ Y e a v e r

Appendix A

0,.~,~ CALCU[.AT!O:';S ,-:,'~ '.-T'~.v r~r ' ~ : . l

2 H~ A~o,6~ Area of inflr, onoo 4.51, 200 v , -

q ~ i ton

Footage Intorva I • o.~:..go and Grade

927.00 - %',,.-~oo 93].~0 - 9 L i o O

1269°0 * ~ / > ~ b i 3 0 5 . o - ~ 3~ 5oo

~11° °O !0.0

• 2 0 ° 0

67_3,6.0.0 ~ " " ' : " " '" . ~o .... Of O . w ' / ~ , . . . . . ; o ~ , _ ~ , 0 ~'~ .... of 0 "~:'~

"" ~o,,~. of :~..)~.$3 ,' cu 3 1 ~ , 7 8 0 . . . . . . - "" / "a

9 o ~ l ; . 0 0 tona of " ' ~

Hole A-973 Araa of influoooo

F o o tat.',: e inter',,,a I

9~> °0 - o0 Q O'.'o 02K.O - 1216~0 • -..

11,%'5.0 - 12o3oo

1 3 3 2 . o - z 4 8 3 o o 1 ~ 3 ' . 0 - !379,Q~ 9 i~O1,0 .O ~ - ~J;b. 1471.O ~t ~,4 - -<-iu2.0

t , 3 . o 2%i °o

i 7 . 0

! to .o 43 °o i2,0

438 ~ 2 ° O,aO l ' b . lO ft, ~ - ~ ton

Tonnage ~.'%d Orado

! ,969, ) . . t00 t e a s o f ,o~ , . , : ~ ' " ~., Cu

[ ; ~ , ' , , ' w t o n a of 0~03! ):~ Cu , ~ I . q ) , - '

8 7 7 , ~ 0 o tons o? O ol,~a ':.:, cu ~-~l~q(~q~).,.O0 "cor~s of O~(".,4o 5<, C',z

"<" 0 < C a '̀< O,j!.16,,,(~O0 t e n s o,. . . , , ~ Cu

I ' ~ OV ' 0 ft 2 ~ ~ Area of InfCuence 7oo~-" . I0 ft. 3 = ! ton

Footage interval *o.nnago ~,nd (]rada

3 7 4 , 0 - e<].~oo i57.o 5 7 k . 0 - 4toz ,o aT°O }~5oo0- 2~59.o poe .sSoo- 5 1 i . o ho.o

i0~52!~600 tons of !~0].2 S Cu 2,073~600 tons of 1 ~ 0 7 0 ',,Z Cu 0,o,.,!,,_~0 tons of 3°370 , Cu p,p~2,Ov~ tons of 2.°598 > Cu

Hole A-e78 Area of i~iuenco 6 3 7 , 6 0 0 ft. 2

Footage Interval

I07'3~O - .!lb,3.O 65~O 13o6.0 - i 3 1 3 o 0 7 , , 0 I078,0 - 1313.0 255.0

I0 ft.3 : 1 ton

~t . , . ~ ' 0 , . ~ - / o -

O ~ L ~ i a o ~ 3 2 0 t o n s o f 0 . , o ~ , ;,, C u IIi.~955,600 tons of 0°656 ;,; Cu

~{oI___£__~. A-O~, ~ a - e a o f Ir~flucncc 8~0.~000 ft~ 2 !0 i't.~= i ton

Footage Intarval

7 0 3 . 0 - 7Z,~o5 : o ° 5

8 3 a o 0 . - 570o0 3 o , 0 q o o o O 1 4 5 0 o 0 - 5zoo z465oO - .1497o5 52°5

0 , " , ' ~ 0 0 0 o::,~s o f ' 3 0 1 5 "-~ ,-, .... ~ OOO ~ ' o f 0 "': " 1.b, '::,o~ ~o.as ~b',.;,; ,.' Cl,.

. . . . ' : o ? o ~ 0 2 4 , w 0 0 bop,:~ I :LJO ,-, ¢ u

~ , , , . a of 0o,..'-; ) ;.; C','e

2 730 000 " " ' " " " ~o,,s o" ! , ~ , ; , / ,, Cu

4 ~

i

|

<-

@

~p:t.o Ar (~O ( c o n t i n u e d )

Footage Interval

• . 3 Q r ~ 69o,,0 - 7-oo:~ i'03 r 87n~O

z!-~,0,o - ~z36o5 /

69o.0 " "': '~ Izqo.o - 111.97o 5 .." , •

1315~0 - 1497~5

22o5 < ! 0 o , , p

0,:) l 4Oo5

s.s o5

F ' ) . , aOls=ia.SO 8Yx] " ~ ' :~

i,890~000 tons 0.2 ._ ,'~, "; m i" / . O P " ~ ' ~ "~ " c),9';o~000 bonn , O~,.,,J,, '",., ,'Ju P~ C' } , ' / - m m ~ ~ > ~ - ~ , u ~ tens cf 2~/ ,21- '.J Cu

or o otio i ;., 8 , 2 7 q ; 000 . . . . . . . ~,o,,., of 0 "zr~a ,~.J Cu O I t /

.'L~,3.~O~O00 to.'.m o f 0 ~'"" .:2~,,o J, Cu

' f o n n a . g e And Grade For Intervals of i }~ O r ' " ~

]]ole

oo ~ f f a Interval k~r ' , ; .C .O

~:@}~!o0,5 [ b,.3718~5~° o0 22,55q .5

.0 - 87Oo0 36.O

I130~0 - iloo~ 6~5

subtotal

1 n o n "" ' ,~ Op ' I CLI .~,u, ,~,u~.. ,~; t o n s . loO'qO ,:c:" ) ~ 9 % : u ~ 0 0 0 t o n s of 0 ~ o ,; - - ~'/~'.-~ b' C l l

2~ 7~30~000 tons of l. r~:'':~ }'; Cu

~ , - - - - - b , , ~ t ~ ~ . -

Z~ioO~000 tons o f 1,~152 ~ Cu

Halo A-(~

374.0 - 511o0 137.0 i0,521,600 tons of 1,012 % Cu *4

92:1.o - 963o0 ~.3.0 1,969~400 tons of 1~23o 77 Cu

Hole A-G6q

1289.0 - 1295,5 6.5 ~{,~0 t o n s cf l ~ . . . . '

H. o l%: :A -9_re"< l o 7 8 , o - I z 4 3 , 0

Total

ty. O;~ ° 0 4, iH}:)400 tans of Io862 j~ Cu

30~136~180 tons of 1 22 < ~'

i I I

I i

, I

u,~.,.,_ Tonn,nfe .and Grade Ay_o.raKr£

696.0- I136,~ 1315.0 - 1z~97~>

x m_A_s27A .~ i q-,,u - 511,0 i,

.n~orval !Ao °5 182 '~ • ~ J

137 o0

.,.o:~n.uge ar.d u~'-.,~..u.~'~" 37~002,000 tons of O.L'.O<. ,-,, C'a i5,530;000 t o n a o:" 0 . S g S ,o':" Cu

I0~521~600 tons of io012 }] Cu

? ¢

5

,l

- U o l c: A - q'-" 3

~"ootar;o 9 2 5 . 0 - . 12.'J.6..0

: [ 52 ,2 ,0 - IL~,33o0 ,, "%/,

~ .p l . 0 >,, ,..,- , ,0 L56S,o - ~ 3 S { , o z2~9oO - z295,5

I:o!~ ~,~

1075o0 ~ 1313~0

Intorval 29! ~0 z5oo5

lO.O 2O,0 6°5

255°0

Total

:IS "~;:~'7 0 0 0 ~" '" "" ._,, .~.~ ,..on,.., of O,,)J,.ll ;, £u

:" ;Q~ 900 ~ n s or 0°42q. j; c~t

. 0 _ ~ , ¢ . - U ~ wO,.~,,~ 0 ~ / "" " ' ,..-,-' ~,.>w ;o C t t

0 , ~ 1 ~ , ;~oO tons 0£ 1 ~" Cu e , t 2

fh A'~t-- ,:; CLI 11~933~800 t o n s of ~o~,0~ /,

9 % 8] . /~ "'" ~: Cu

• ,,E ~

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t

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i

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S~c...So

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I

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I

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/ . - ~ - ' , ' --- - - - , / ' ~ ' • , ' / ~ " ' k *~ ' ;

, / • ~. ' 7 ' \ / ' /f r ' / ! . • . ~" ~ '

I • " I / ~ _ ._ . . . . - - .e . . . . . ' " ' / 1 " ~ ~ " ' " " "~"'~-"-~---------~- - " / - - - " % .,.,~';,--" ..

, L _ _ / ~ ' . , . ~ \ . ~'o~, ~.., .

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Arizona Geological Society Digest~ Volume IX, November 1971

UPLIFT AL~D GRAVITATIONAL ADJUST~ RUBY STAR RANCH AREA

PIF~ MINING DISTRICT~ ARIZONA

Richard R. Weaver Humble 0il Company

197

INTRODUCTION

t

"i . . - i Z

, , ,

• )

The Ruby Star Ranch area lies approximately twenty-five miles southwest of Tucson, Arizona. and is centrally situated in the Pima Mining district (Figure II. The Pima MininF district is the Isr'~est m~nin~ district in the S c u b a p c t ~ S~#v~ 8f a c ~ u t a o1~on ~-~n~ o-f-~o~per and molybdenum, and nearly ten million tons reserve of lead, zinc, and silver.

In spite of the considerable geological and geophysical effort expended in the Pima district, the paucity of outcropj the complexity of structure, and the complicated igneous activity have led to varied interpretations of the geological relationships and ~ history. The ptu~pose of this paper is to describe and to interpret the tectonic features in the Ruby Star Ranch area, which the writer believes are the result of uplift and gravitational adjustments and are applicable to the district as a whole.

.

"I

]

T~f fieldowork on the area commenced in June, 1960, and : n (] t r ~ : ~ J ~ ~ w a s e ~ ~ y Bear Creek Mining Company. f~ring tb~s interval, detailed surface mapping was carried on and a total of 55,726 feet was drilled in 71 holes. All subsurface work was correlated to surface geology whenever possible.

~(~,e. ¢ ¢ o" .... m [; ,~ ~ ~. REG 10NAL GEOLOGY

The southwestern part of the Pima ~ning district is in foothills which are continuous with the Sierrita Mountain mass and contain the Esperanza Mine. The remainder of the district is a broad, extensive, gravel covered pediment above which project a few isolated hills such as Foy Ridge, Twin Buttes, and Helmet Peak. This gravel cover is from tens of feet thick in the western part o2 the district to more than 2,000 feet in the eastern section.

Rocks exposed or present in the district rap~e in age from Precambrian (?) to Recent and consist of sediments, intrusive granitic rocks and volcanic flows.

The northern end of the Sierrita Mountains is composed of Tertiary granodiorite. South of a line passing approximately

PETER

Z

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i - . . . ,

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198

0 5

MILES

~-, ~'" ,,%%

[ . t,,-

.%'`- g !"':

M C G E E

~"~,

MOUNTAIN/~ "- ~ ~- ~

. . . . - - , ~ , i

,"D i~." \\

.°"

• ~.%.. ' ' " ' " P.ALO. "~1i~. -MISSIONVERDE . ~" "~ "i.~.,.x,. "i

/~ HELMET P£AK

~

) • LESPERAN'~

N .. . . . \ % ................ << ..... ., ,,,:~..,~:'~

: .:'/

'~UARITA

D Outline of the Pima Mining D;strJct

Ruby Star Ranch ~ e a

. u;).*" FauJfgd t rougt l

Figure lo--Index Map of the Pima Mining Districto

l

q

{

.... 7

.

199

through the McGee Ranch, the Sierrita Mountains are composed of Cretaceous - Ter%iary sediments and volcanics similar to the units in the Esperanza Pit. Southeast of the Esperanza Mine these volca nics are, in turn, overlain by Recent (?) turfs and r~ToliteSo

West of a general north-south line, wDich starts about one and a half miles east of the Esperanza Pit and continues to the gravel covered area on the San Xavier Reservation, the Tertiary granodiorite floors remarkably even pediment surface. Eas~ of this line, Cretaceous (?) sediments on the south overlie the folded Paleozoic sediments northward to Twin Buttes.

North of the ~vin Buttes, in the Ruby Star Ranch area, a large, deep trough trending northeasterly has been filled with Miocene (?) sediments called by Cooper (1960), Helmet Fang!omerate. This fanglomerate fills the trough and extends northward to a line about one and a half miles south of the San Xavier mine.

Beyond the north edge of the trough to the San Xavier ~ne, Cretaceous (?) sediments again overlie Paleozoic units. The basin between the San Xavier Hill and ~.~neral Hill is part!ally floored by Cretaceous arkose on the southern side. The arkose covers the Pima-Mission area, overlD~ng Paleozoic sediments to a second northeast-trending trough on the San Xavier Reservation. On the north boundary of the district, in a third northeast- trending trough, the Recent (?) Black Mountain basalt overlies mid-Tertiary gravels and Cretaceous (?) sediments.

Based on drill core data, the southern trough appears to be a hinged structure with the northern edge remaining relatively stationary and forming the hinge line. The middle trough appears to be similar structurally, and little is known of the northern- most one.

A flat-lying fault or sole separates parts of the Paleozoic section, Cretaceous (?) comolex, and Tertiary deposits from unSer- lying Precambrian (?) granite and Larsmide granodiorite. This sole fault extends from at least the ~.[±ssion ~:ine southward thro~Eh the Palo Verde and Daisy Mines, the Fi~a ~ne, and the San Xavier ~!ne to just north of Twin Buttes. This ~s ap;roximatel[ six and one- half miles in a north-sou~h direc~ic~ and the ~otal area un~er!afn ~y th@~sole fault is at a minimum ~hirty-four square miles.

STRATIGRAPHY OF SED~.~NTARY ROCKS

Post-Permian metamorphism has complicated the identifi- cation of the stratigraphic units in the Ruby Star Ranch area. Re- crystallization of the limestones and alteration of the shales and sandstones to hornfe!s and quartzites obliterated the majority of fossils, except for several reef structures in the ~rtin Formation and a few brachiopods and gastropods in the Naco Gro1~. The Paleozoic sequence is best represented in the ~in Buttes and Foy Ridge sections.

to~o~b~,~ % 9~r.~c_T ~

4

200

.~.°~

AGE UNIT

Pennsylvanian- Naco Group Permian

THICKNESS IN FEET DESCRIPTION

600 ÷ Thin beds of limestones, shale and sandstone. All members metamcrphosed. Contains interbeds of gypsum.

Lower Escabrosa Mississippian Limestone

55o Massive, llght gray to white, coarsely crystalline .-marble.

Upper Martin Devonian Limestone

440 Light tan to gray, slightly dolomitic limestone with occasional zones of fine-grained marble.

Upper Abrigo Cambrian ~ . Formation

200 Banded limestone with alternating layers of hornfels, quartzite and limestone°

Middle Bolsa 500 Fine to medium grained Cambrian Quartzite arkosic quartzite.

• TABLE 1. Generalized Sequence of the Paleozoic Sediments, Ruby Star Ranch Area.

Unconformably overlying the Paleozoic sequence is a complex of arkose, gray~'acke, pebble conglomerate, quartzite, shale, pyro- clastics and thin beds of limestone. The age of the complex is assigned to the Cretaceous on fossil evidence (Mayuga, 1942), but could be upper Jurassic, lower Cretaceous, or both.

The Helmet Fsp~lomerate of Miocene age (Cooper, 1960) is the most wide-spread formation in the area, but it is mainly con- fined to the southernmost trough. It has an average strike of N.60°E. and dips about 55°SE, with dips lessening to approximately 20 ° in the southern part of the area. The Helmet is a poorly- sorted conglomerate containing cobbles and boulders set in a silty matrix. The conglomerates tend to be finer grained in the eastern section of the area, and tend to be more monomictie and coarser in the western part. This suggests that the sottroe area was located to the west.

/ i

\ ,\

\

201

~r~ER LOCATION DESCRIPTION

Upper Southern Fragments of all rock types found in the Nember Third icwer two members. ~onolithologic breccias.

Southwest of the Ruby Star Ranch 50% of the fragments are granodiorite.

Middle Central Member Third

Fragments of the Cretaceous (?) complex and minor granodiorite and Pa!eozoic rocks, including copper stained tactite. Interbeds of tuff and detached blocks of members of the Naco Group.

Lower Northern Member Third

Andesite flows Fragments of Cretaceous (?) complex. Few granodiorite fragments. No paleozoic or Precambrian (?) fragments.

TABLE 2. Generalized Stratigraphy of the Helmet Fanglomerate.

2

IGNEOUS ROCKS

Two periods of igneous activity are recognized in the Ruby Star Ranch area: (1) Precambrian (?) granite and diorite, and (2) Cretaceous-Tertiary intrusions and flows.

P recambrla n

The Sierrita granite is of probably Precambrian age (lacy, 1959) and is found cropping out along the western perimeter of the sole fault, In outcrops west of Foy Ridge, and in drill holes beneath sediment in the northern three-quarters of the area.

A diorite of probable Precambrian age intrudes the Sierrita granite. Surface exposures and drill hole data indicate that the diorite extends frcm the SE/4, sec. 15, to the S/4, sec. 263 T. 17 S., R. 12 E., a distance of I!,000 feet in a N.15ow trend. It has a minimum width of 2,500 feet.

Cretaceous - Tertia/~

Quartz Lat!te Breccia. A quartz !atite breccia is found resting either ~onformabiy or unconformably upon the Cretaceous (?) complex in the western part of the area. In part, this unit is a welded tuff. If this quartz latite is a forerunner of the Larimide granodiorite batholith, found in the western part of the district, it is probably of upper Cretaceous age.

Andeslte. Andesite is found intruding and lying unconformably"~of the Cretaceous (?) complex and the quartz latite breccia. It is probably of upper Cretaceous in age.

Granodioriteo A granodiorite batholithic complex occurs in the western part of the Pima Mining district, and the

7

/

a

. . . . . . 1

i ,

202

easternmost exposures are found in the Ruby Star Ranch area. The Laboratory of Geochemistry of the University of Arizona obtained an age of 58.7 ~ 1.9 million years (Damon, et. al., 1964).

Another granodiorite intrusion forms the core of the Twin Buttes-Foy Ridge anticline, and is nrobably of the same age and related to the granodiorite batholith.

Quartz Vcnzonite Pornh~:rZ. Small stocks of quartz monzonite porphyry intrule the sole fa~lh and the overlying brecoiated formations in the northwestern Dart of the area. The stocks Post date the sole fault, but they are not found cutting the Helmet Fanglom- erate. This confines the age to the Eocene or 01igocene Epochs. The stocks are probably late-stage derivatives of the Laramide granodiorite pluton.

Andes~te Flows and Dikes. Andesite flows with plagioclase phenocryst attaining cne-half~ch in length are interbedded with the Helmet Fanglcmerate, and separate the lower and middle members of the formation. Similar flows in the Tucson Mountains have been dated at 28 + 2.6 million years (Damon, et. al., !964). The

~ ndesite dik~ cuttip~ the He!~et was ~ated at 2~ million years Creasy and Kistlerj 1962).

STRUCTURE

Introduction

After the emo!acement of the Sierrita granite and the intrusion of the diorite in Precembrian times, the district was relatively quiet throughout the ?aleozoic Era an~ the early part of the Nesozoic Era. In the Cretaceous, however, the area became unstable, as shown by the complexity of the Cretaceous strata.

By the end of the Cretaceous a granodiorite batholith be- gan rising in the western sector of the district, causing doming of the whole Sierrita Mountain area. As domin~pregressed, peripheral stretching- ~ in the eastern fringe zone of the dome produced at least three r~dial troths. Thus, the consequent increases in relief, produced by doming~and crustal sagging in the troughs, set the stage for the gliding of sediments from the roof of the batbolith.

Development of the St_~uctural Troughs

In the vicinity of the ~-[cGee Ranch (Fi~ulre I) platy flow structures in the laramide ~ranodlo~ " .... ~= batholith have a N.!0°& 20°W. trend and dip vertically to steeply westward. In the easternmost exposure of the batholith, the same platy flow structure trend is maintained, but the dip is 55o-60 ° eas~ward. North of the Esperanza ~.[ine, a more w%akly developed flow structure trendi~z N.65°-ZS°E. and dipping steeply cuts across the stronger N.15OW. trending ones.

Steeply dipping apllte dikes trend N.50°-70°E. across the batholith. Joints oarailel to the aplitic dikes are coated with quartz, muscovite, eoldote, chlorite, ahd sn]all amounts of sulfide. They are striated locally. Normal faults witfain the batholith trend N.65°-75°E. and dip southward 25 - 30 degrees.

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Pigtu~ 2°--Geologlcal Cross Section Interpret~tlons Based on Drill Core Data, Ruby Star Ranch Area.

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204

The structural elements in the batholith suggest that the pluton rose as a dome along a N.15°W. trending axis, and as doming progressed the pluton stretched along its northerly trending axis producing tension fractures striking N.50°-70°E.

As suggested by the flow structure in the batholith, the older rocks in the fringe zone not only adjusted to the comeermation of the invading pluton by stretching in a vertical direction, but they also adjusted to the longitudinal tensional forces produced by the lengthening of the pluton in a northerly direction. The longitudinal stresses resulted in peripheral stretching around the eastern fringe zone of the batholith. Relief from the peripheral stretchip~ was gained by fracturir~g in an east to northeast direction as recorded in the Pima ~[inlng district. Stresses resulting from continual uplift and peripheral stretching were relieved by extension on these fracture systems, giving rise to radial sags and troughs.

The three known troughs in the district tend to form a fan- shaped pattern, which converges toward the batholith (Figure I). The southern trough trends N.60°E. as does the middle one, but where the fringe zone begins to swiP~ northwest around the northeast flank of the Laramlde batho!Ith, the. northern trough assumes a N.40°E. trend. This radial pattern also suggests that the troughs are related in origin to the domal structure.

After the initial stages in the development of the southern trough~ the western end of the trough was invaded and healed by the granodiorite batholith, and may have been somewhat uplifted as doming progressed. The stratigraphy of the Helmet Fanglomerate indicates that the trough probably formed over a considerable length of time; at least from the late Cretaceous through late Miocene times.

Gravltaticnal Glidin~

Drill hole data demonstrates that in the southern part of the area, beginnip~ just north of Foy Ridge, ~mbers of the Naco Group are in flat fault contact vith the underlying Precambrian (?) granite and portions of the Laramide granodiorite. In the northern part of the area, the Cretaceous (?) complex is found separated by a flat fault from the underlying Sierrita granite. This fault contact, or sole, usually dips eastward IO ° to 25 °, and a black gouge zone from six inches to six feet in thickness separates the granitic rocks from the overlying strata. Both the granitic rooks ,and the overlying strata are strongly brecciated and sheared. It is upon this fault that the portions of sedimentary and volcanic shell of the domal structure glided eastward to their present . position in the trough. Since no forw.ations older than the Naco Group were found while drilling the glide plate, it is proposed that gliding was initiated by failure in the gypsum beds of the Naoo.

As the plate of sediments migrated eastward, it rode over O O the Sierrita Granite in a No75 --80 E. direction as indicated by the

striations in the granite in the western part of the area (Figure 2). Segments of the Naco Group were thinned by frictional drag along the basal shear plane, and some segments became retarded by the lows present in the irregular surface along the sole of the plate.

A good example of retardation of segments of the glide plate, '

and overriding by your~er units, can be seen in the drill hole data

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206

from the western half of sections 23, T. 17 S., R. 12 E. (Figure 2). A configuration resembling a glacial step is present. The closely spaced contour lines in Figure ~ would be the riser, the flat plane to the east would be the tread, and the high that ter- minates the plane to the east would be the riegel. This riegel in the Sierrita granite acted as a barrier and retarded basal members of the Naco Group as the gliding mass moved across the step.

As this Naco block became arrested and formed the "is- land" of limestone (Fig. ~), overlying younger units continued to glide east over the retarded block on flat-lying, imbricate, shear planes formed as indicated by slivers of the Naco thrust over Cretaceous units.

As gliding of the whole plate progressed, frictional drag along the sole fault produced north trendZng tensional faults. The formation of these faults was facilitated by the plate moving over small highs in the underlying granite~ Also, local differences in frictional drag along the sole of the plate caused diff- erent rates of motion throughout the gliding block. As the differences in velocity of motion increased, the rocks of the plate yielded by shears forming N.70°-8OOE. strike-slip or tear faults. Adjustments a~ong these shears opened and caused more movement along the north trending normal faults.

roy Ridge - Twin Buttes Anticline

The Foy Ridge - Twin Buttes fold is a northwest-plunging anticline, the axis of which strikes N ~5°W and plunges 25 to 45 degrees northwest. Beds on both flanks of the fold have a general northwest strike and dip steeply. Part of the succession on the southwest limb of the anticline is repeated and overturned to the northeast, suggesting that thrust faults also developed along the southwest limb of the fold carrying older Paleozoic formations northeastward over younger Pa!eozoic rocks.

The structure of the anticline is controlled primarily by the emplacement of the Laramide granodiorite stock in the core of the fold. As the stock intruded, it caused doming and breach- ing of the sedimentary cover. As intrusion into the core progressed the sedimentary shell was also stretched longitudinally. The beds yielded along northeast-trending tensioned faults, per- pendicular to the direction of extension. These faults show vertical as well as horizontal movement, indicating adjustments in several directions as doming progressed. This situation is analogous to structural development of troughs in the Pima Dis- trict, but on a smaller scale.

It is not known if the granodiorite stock in the Foy Ridge-Twin Buttes fold is the same age as the Laramide batholith or is slightly younger. The writer believes that is is slightly your~er than the batholith and classifies it as a late stage derivative of the batholith.

Drill information indicates that just north of Twin Buttes in sec. 29 and 30, T. 17 S., R. 13 E., detached blocks of Naco and granodiorite are both interbedded with and overlie the Helmet Fanglomerate beneath the Recent alluvium. Also the limestone hill located about a quarter of a mile northeast of Twin Buttes contains beds that strike parallel to the strata in the Twin Buttes, but dip much more steeply north~:ard. The limestone belongs to the lower Naco Group and rheas i~ out of

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Figure ~.--Geologlc Map of the Ruby Star Ranch Area~ Pima County, Arizona.

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208

stratlgraPhie pesi~!cn with respest i~o th~ s~roundln~ s~uenee. P~mhaD@ t~ de~acbed hlcck~ and the !Imes~one hill ~e pa-~ts of slid sheets that ~!id~d sOmthwsr6 off the Twin ButDes fold.

T e~tQoi~ Ac~:iv~.t'F_ Durin~ the Depositlon

Larg~ l~n~ils derived f~m t h e Naco G~o~p a~e f'o~.Lnd inte_~ bedded with the mlddie and uppez- m~mbers mf ~h~ He!mm~. Th~se units are bmecc&ate~ and show s!!ppa~a alo~ thmir contacts with o~r~LCme~ate beds and with volcan~e ash D~iDs. Strati~r~phieal!y ~h~se lentils ame inverted. I~ dse@ not ~em ~ro~able that three dlffemmnt len~Is soa~%~ed th~ov~hout ~he Helmet should br~ak off" f~om ~am~em b!o@M~ and be inve~te~ in ~ p~o~sm. [~ is m~r~ llk~ly ~hat ~ were inverted D~ dl-ape foldin~ before be~m- ID~ detached or ~sve~ed d~rir~ emplac~m@nt. Thi~ woul~ =~an ~hat ~Dlift s~ ~Idlr~ wsTe still ID progress while ~he ~el~@t was stadium/is tir4~.

A meve~al in ~e sequence o f the f~aEmentB oomDoBir~ the fan~!~ate--!.e, a~Mose fP~ments depo@ited before Paleomo!e fre~mentB--D!u~ lenses uompose¢ of rook fmasments of one ty~ ~ s t that the H~l~e~ i8 a t !eSS~ ~n 9&~t .~.p~odUe% Of b~k ~9 sad e~o~on o9 Pa!eo~ole ~nd O~ta~eous ~?) slip ~hee~ as ~hey migrated towered the rau!%ed ~ou~h. T~e Naeo lentils of th~ Naoo ape parts of these Bllp @hea%s~ hu~ a~e still intact even ~omuSh ~mongl~ breeola~ed. 9z~sum~hly ad~i~lona! fra~mmota~ion was inb_Ibi~sd because of ~e l~m~esti~ e~fmnt pmov~ded ]~y t~e soft ash ~e~s ~sso~iate~ wi~h some 09 ~he lentils.

T~.nB the fanE!@memate was no~ only depo~ite~ ~M mu~ flow~ Tnzt by mi~catinE all; sheet@ fmom ~ne still te~onies!ly ~etive ~ome in the weste~D pa~ of the district. That tb~s dominE was still a~tiv~ during the @eDnsit~On of the Helmet ~an al~o be d~mons%Tat~d By ~h@ frssm~nts present in $~e upf~m mem~m o~t th~ ~elmet; these represent all meek %-~98B found in the Iowem units plus ~n abundance Of Eranodiomlte fr88~n~s, These fraEm~nts# ex~e~t f~ t~e ~manodlomite ones, a~e probabl~ meworkmd from . eam!le~ deposlts of fan~l~am~ate in the western DBf~ of t~e ame~.

The general ~mend of the Helmet ~oday is N 60 ° E with • d.'I.Ds deoreasin~ to the ~outh. Thus tiltin~ needled ~ot~ dumir~ and ~f~em deDosi£ion. The adde~ weight 09 the Helme~ p!u@ con- t~nued ~plift in t~e western par '~ o f "~ine dlatmlot caused major ad~%~stments alon~ the south~mn bo~ndal, y fault of the tmou~h. The north limb and @loot o~ th8 tro~Igh sl~o dme!~ped-bu# to le@se~ ~xtent so that ~he blr~-line effect a l o n s th~ northern bu~e~ we@ strained; h~n~;e tiltin~ the Helmet Par~Iom~rate south~ wa~'d.

CONCLUSIONS

Based on ell available surfac~ and s~bsurface ~a~a in the ~ubM Star R~neh area, the %Tite~'S ~sn~luaIDn~ are as follows"

I. Be~innlng in ~metaoeoue time, ss In~i~sted by the deDom!t~ @~ %ha% ~a the ames b~eame tee~onloally unstable. The instability may possibly mecord th~ first sta~es of ms,ms emplacement mt ~epth.

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209

2. Uplift was climaxed by the emplacement of a large granodiorite batholith in the western part of the district. A stock of granodiorite was also intruded into the core of the roy Ridge-Twin Buttes anticline at approximately the same time, andlt lifted, overturned and thrust aside its Paleozoic cover.

3. During intrusion, the region rose as a unit, and failed along transverse and radial fractures. Structural sags along these radial fractures gave rise to faulted troughs, thereby increasing and steepening the tectonic relief.

4. Striations, and the presence of an extensive sole fault, as well as the peculiar distribution and variations in thickness of Paleozoic limestones, very strongly suggest that the sedin;entary shell of the rising dome slipped off into a large east-northeast-trending trough.

5. Subsequent to the emplacement of the allochthonus strata several small quartz monzonite porphyry stocks intruded them. These stocks are probably structurally controlled and are late derivatives of the granodiorite pluton.

6. The deposition of the Helmet Fanglomerate, with minor Paleozolo slip-sheets, upon the allochthonus nooks was a result of continued upheaval of the domal area.

?. Development of the steep southward dips in the sediments filling the trough was a result of further tensional adjustments and sagging consequent upon continual uplift.

8. The final development of a pediment throughout the area indicates ultimate attainment, or very close approach, to equilibrium.

It is suggested that the concept of uplift (primary tectongensis) and gravitational adjustments (secondary tectongensis) offers the possibility of rational explanation of the otherwise puzzling features of the Ruby Star Ranch area geology.

REFERENCES

Bowman, A., 1963, History, Growth and Development of a Small Mining Company: Mining Engineering, v. 15, June~ p. 42-49.

Brown, R. L., 1926, Geology and Ore Deposits of the Twin Buttes District: University of Arizona Thesis, 40 p.

Bryant, D. L., 1955, Stratigraphy of the Permian System in Southern Arizona: University of Arizona Thesis, 209 p.

Bucher, W. H., 1956, Role of Gravity in 0rogensis: Geol. Soc. America Bull., v. 67, p. 1295-1318°

Burroughs, R. L., 1959, The Structural Geology of the Foy Ridge Area, Twin Buttes, Arizona: University of Arizona Thesis, 76 p.

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210

Cooper, J. R., !960, Some Geologic Featul'es of the Pima Mining District, Pima County, Arizona: U. S. Geol. Survey Bull. lll2-C, p. 63-105.

Creasey, S. C. and R. Wo Kistler, 1962, Age of Some Copper-bear- ir~ PorpD~rles and Other Igneo~s Rocks in Southeastern Arizona: U. S. Geol. Survey Prof. Paper 450-D, p. 01-05.

Cu~nlngs, J. B. and T. M° Roms!o, 1950, Investigation of Twin Buttes Copper Mines, Pima County, Arizona: U. S. Dept. of Interior, Bureau of Mines, Rpt. of Investigations 4732, 12 p.

Damon, P. E., !9~4, Correlation and Chronology of Ore Deposits and Volcanic Rocks: Annual Progress Rpt. C00-689-42 to Research Div., United Atomic Energy Comm.

DeSitter, L~ U., 1956, Structural Geology: First Edition, McGraw- Hill Book Company, inc., New York, 552 P.

Eohel, E. B., i9~0, Geology and Ore Deposits of the Mineral Hill Area; Pima County, Arizona: University of Arizona Thesis, 51 p.

Galbralth, F. W., 1959, The Empire Mountains, Pima County, Arizona: Southern Arizona Guidebook iI, Ariz° Geol° Son., p. 127-139.

Gilluly, J., J. Cooper and J. Williams, 1954, Late Pa!eozoio Strati- graphy of Central Cochise County, Arizona: U. S. Geol. Survey Prof. Paper 2~6, 49 Do

Houser, F. N., 1949, The Geology of the Contention Mine A~ea, ~in Buttes, Arizona: University of Arizona Thesis, 61 po

Hubbert, Mo K. and W. W. Ruby, 1959, Role of Fluid Pressure in Mechanics of 0verthrust Faulting: Geol. Soc. America Bull., v. 70, p. 115-206.

Irwin, G. W., 1959, Byrometasomatic Deposits at the San Xavier Mine: Southern Arizona Guidebook II, Arizo Geol. Soc., p. 198-199.

Kinnison, J. E., 1963j Probable Origin off Mission Copper Deposit: A.I.M.E. preprint No. 63133, 14 p.

Korn, H. and H. Martin, 1959, Gravity Tectonics in the Naukluft Mountains of Southwest Africa: Geol. Soc. America Bull., v. 70, P. 1047-1078.

lacy, W. C., 1959, Structure and Ore Deposits of the East Sierrita Area: Southern Arizona Guidebook II, Ariz. Geol. Soc., p. 185-192, 206.

Lacy, W. C. and S. R. Titley, 1962, Geological Developments in the Twin Buttes District: Mining Congress Journ. Reprint, April, 4 p.

Mayas, M. N., 1942, The Geology and Ore Deposits of the Helmet Peak Area, Pima County, Arizona: University of Arizona Thesis, 124 p.

Park, C. F., 1929, Geology of the San Xavier District: Univer- sity of Arizona Thesis, 30 p.

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211

f:

b

Ransome, F. L., 190~, Geology and Ore Deposits of the Bisbee Quadrangle, Arizona: U. S. Geol. Survey Prof. Paper 21, 167 p.

~ , 1922, Ore Deposits of the Sierrita Mountains, Pima County, Arizona: U. S. Geol. Survey Bull. 725, Pc 407- ~28.

Reeves, F., 1926, Origin and Mechanics of Thrust Faults Adjacent to the Bearpaw Mountains~ Montana: Geol. Soc. America Bull., v. 57, P. 1033-]047-

Richard, K. and J. H. Courtright, 1959, Some Geologic Features of the Mission Copper Deposit: Southern Arizona Guide- book II, Ariz. Geol. Soc., p. 200-204.

Studebaker, I. G., 1959, Structure and Stratigraphy of the Helmet Peak Ares, Pima County, Arizona: University of Arizona Thesis, 26 p.

Thacpsw, S. C., 1960, Geolc~ of the Ruby Star Ranch Area, Twin Buttes Mining District, Pima County, Arizona: University of Arizona Thesis, 59 P.

Waller, H. E., 1960, The Geology of the Paymaster and 01ivette Mining Areas, Pima County, Arizona: University of Arizona Thesis, 48 p.

Weaver, R. R], 1965, Struct%tra! interpretation of the Ruby Star Ranch Area, Pima Mining District, Pima County, Arizona: University of Arizona Thesis, 74 p.

Webber, B. N., !929, Marcasite in Contact Metamorphic Ore De- posit~ of the ~zin Buttes District, Pima County, Arizona: Econ. Geol., v. 24, p. 304-310.

Whltcomb, H. A., 1948, Geology of the Morgan Mine Area, Twin Buttes, Arizona: University of Arizona Thesis, 82 p.

Wilson, C. A., 1960, Ore Controls of the San Xavier Mine~ Pima County, Arizona: University of Arizona Thesis, 55 P.

Wilson, E. D., 1950, Pima District; Chap. IV, Arizona Zinc and Lead Deposits, Part I, Ariz. Bureau of T.~nes, Geol. Series No. 18, Bull. No. 156, v. XXI, No. 2, p. 39-51.

Wisser, Ed., 1£60, Relation of Ore Deposits to Doming in the North American Cordillera: Geol. Soc. America Mem. 77, 117 p.

i

B EAR

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REPORT ON THE PETRO PROPERTY, TWIN BUTTES AREA, PIMA~ COUNTY ,. ~ ..

•

This drawing to,other wlfh any en4 a|l ~ddlf|o~s, correctier~a, "~h~n~~nd alterations thereof i~ the property af" Peter M. ~Ro[~b.i~s and is "~urnio}~ed on the oxpress ¢o~2dit[orl that it shall

not' be "reproduced, copied, lent, at' disposed.of directly or ln- dlrectly, no~ used for ~ny other purpos~ than for which it i& s;0e~fical!y, fur.n.ish~d w;thaUt prior wrmen co~sent of a~d

,.,~

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:By

Richard R. Weaver

Table of Contents

Introduction Method of Attack Geology Drilling Claims

IP'Method Graphic Log Assay Data Sheets Written Logs

Plate i Plate 2 Plate 3 Plate 4 Plate 5 Plate 6 Plate 7 Plate 13

Geology Map Surveyed Claim Map IP Line and Station Location IP Profile Map Gravity Survey Map E M Data • Cross Section Drill Hole IP

Page No~ i I I 2 2

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GEOL0.GICAL REPORT OF THE PETRO PROPERTY

Introduction

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On July 28, 1960, Bear Creek Mining Company entered into agreement with Marion Chilson, et al, for the exploration of 29 unpatented mineral claims in the Pima Mining District, Arizona. The agreement was terminated -'-~o~- O~ , 196~.

The claims lie on the north flank of the Twin Buttes, approximately 30 miles southwest of Tucson, Arizona. They "are located in Sections 19, 29, 30, and 32, TI7S, RI3E.

Work accomplished By Bear Creek Mining Company on this area consisted of geologic mapping, 5.2 miles of geophysic@l IP traverses, a gravity survey and 8,546.0 feet of diamond drillzng.

Method of Attack

Geologic mapping was done on I'~500' aerial photos and trans- ferred uncorrected to a I'~500' overlay (see Plate i). The geology and claim outlines are slightly distorted, due to the normal distortion inherent in air photos. A corrected 1"=500' claim survey map accompanies this report.

~Geo!oxy ~

Outcrops are sparse on the property, except in the northeast corner ~ere a hill of Pennsyl~anian-Permiam limestone is exposed, and in the extreme southwest corner a small outcrop of Mississippian limestone is mappable.

These two units are metamorphosed to marble, hornfels and minor amounts of talc-silicate minerals. The average strike of the stratigraphic units are 40o-45o and dip 65O-vertica! NE.

The rest of the area is covered by Recent alluvium tens of feet thick, which is underlain by Helmet fanglomerate of Miocene(~) age.

(a) A smnll amount of mineralization is exposed on the surface in the area. The limestone hill in the northeast corner of

¢ ",

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the area has some disseminated digenite(?) and chalcopyrite plus minor copper carbonates. The extent of surface mineralization is very limited.

Drilling

Eleven holes were diamond drilled on the property during 1960, 1961 and 1962 for a total of 8,546.0 feet.

Summary of DKil!in~

Hole RB NX B X Total

T- 6 270.0 105.4 377.9 753.3 T-16 42.0 125.5 378.0 545.5 T-42 2.0 ~ 542.3 - - - 544.3 T-45 I0.0 554.0 .... 564.0 T-47 200.0 387.3 487.0 i074~3 T=48 240.0 770.8 - - - 1010.8 T-67 168.0 958.4 - - - 1126.4 T-68 197.9 779.1 - - - 977.0 T-69 200.0 964.1 1164.1 T-70 196.0 314.0 - - - 510.0 T-71 148.0 128.3 - - - 276.3

±

1673.9 5629.2 1242.9 8546.0

Claims °

.J

A claim map given to Bear Creek Mining Company by Richard Chilson and the legal claim descriptions on file in the Pima County Court House display and describe, respectively, the Venus claims as a contiguous claim group.

Upon surveying the Venus claim group, it was discovered that the claim notices for Venus 9 and II were positioned in the field as shown on Plate 2, thus creating a gap between the location of Venus 9 and 7. No claim notices were found for Venus I0 and 12, so their exact position is not known.

According to claim descriptions describing Venus I0, it can be located southwest of Venus 8 or southeast of Venus 9. Venus 12, according to claim descriptions, may be located southeast of Venus 9 or southeast of Venus ii.

9

Because of the possible existing g'ap, Bear Creek Mining Company located Venus 13 and Venus 14, which will be quit- claimed to the optlonors.

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BEAR CREEK ~I N ING COMPANY SOUTHWEST DISTRICT

REPORT ON EDWARDS ET AL GRO~D TWIN BUTTES AREA

PII~ COUNTY, ARIZONA

• ~u!qqo~ "W ~a~ed

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kJ

September 25, 1962

11ds .drawing together v~4th any ~hd ~! additTan~, corr~¢llOr~ cha~ges and~ efferat[on~ ithereof is the property of Peter M. Robbin~ and is furnished on the express condi!ion that it shall not be reproduced, copied, ~e.~:t, oF d~F..~d o~ dlrecfly or |n- d!rectly, nor used. for an V o~hcr purpose 'lh~n for w~ich It ]e Speclfically..furnlsffed without prior w r i ~ n consent o f said Petee M, Robb|r~=.

.~°,i

TABLE OF CONTENTS

GEOLOGIC REPORT

S~il-PiONTHLY DRILL REPORT

GRAPHICLOGS

ASSAY DATA SHEETS

INDUCED POLARIZATION I,~THOD

LIST OF ILLUSTRATIONS

GEOLOGICAL I,~P

INDUCED POLARIZATION i.~P SHOWING LOCATION OF TRAVERSES AND STATIONS

INDUCED POLARIZATION PROFILES

6 " L

GEOLOGICAL REPORT OF THE EDWARDS ET AL PROPERTY

LOCATION AND HISTORY

On January 15, 1960, Bear Creek Mining Company entered into agreement with Edwards, Hunziker and Sevits for the exploration, of 94 unpatented mineral claims in the Pima Mining District, Arizona. The agreement was terminated August 9, 1962.

The claims lie on the northeastern flank of the Sierrita Mountains and approximately 20 miles southwest of Tucson, Arizona. They are located in Sections 17, 18, 19,.20 and 30, TITS, RI3E. ~

~rk accomplished by Bear Creek Mining Company on this area consist of geologic mapping, 6.8 mile~ of geophysical I.P. traverses and6085.6 feet of drilling in 6 holes.

P

GEOLOGY o

There are no outcrops in the area which is entirely covered by recent alluvium. Drilling indicates that the alluvium is underlain by Helmet fanglomerate, which is of probable Miocene(?) age.

All the drill holes, T-4, T-30 and T-66 failed to reach bedrock even though the respective footages were 839.9 feet, 1808.7 feet and 661.1 feet. They cored Helmet fanglomerate only.

~',~! hole T-22 encountered bedrock at approximately 548 feet aL,d penetrated limestone. The limestone contained very sparse sulfides consisting of galena, chalcopyrite and bornite and was altered to hornfels and garnet zones, t~~roximatel_M 1304 feet quartz monzonite was penetrated which was unaltered ana unmlneralized.

In holes T-32 and T-34, oxides of copper were encountered at the bedrock surface and extended to the base of oxidation. Below this point, no significant copper mineralization was iL,- tersected.

The rock consists of an interbedded sequence of fine grained marble and fine grained si!tstone(?) members. The latter are commonly highly altered to clay. Locally small beds of tactite occur but do not show any sulfide mineralization.

Drill holes T-32 and T-34 penetrate quartz monzonite at 690.0 feet and 645.0 feet respectively, but it was not mineralized.

1

• l

-2-

T'4:

0' " 158.4'

T-4:

158.4' - 306,0' \

306.0' - ?33.3' Q

July 16 - July 31, 1960

Alluvium and San Xavier (Helmet) Conglomerate. sand and gravel to 140, becoming caliche to 142.5 where entered the red pebble to boulder conglomerate locally known as San Xavier conglomerate and termed Helmet fanglomerate by Cooper. No :~bedrock ~' by end of period.

l

August i - A95ust 15,.196Q

• Rockbit, no core l

San.Xavier (Helmet) Conglomerate, clay to boulder size angular parEicles of arkose, sandstone, quartzite, limestone and porphyry in matrix of red mudstone which is somewhat calcareous, semi-consolidated.

T-4:

726.6' - 839.3' i

T-30: L |,

0' - 181.0'

August15 - August 31 T 1960

San Xavier (Helmet) fanglomerate

July.!6- July 31, 1961

Rockbit

l,

T-30:

181.0' " 724.0'

T-32: ! i J ,,,

00.0' - 96.0'

96.0' " 175.3'

175.3' " 374.0'

374.0' - 483.1'

483.1' - 673.9'

673.9' - 686.2'

686.2' - 691.9'

T-30:

724.0' - 991.0'

T-32: J , ,

691.9'- 741.01

August I - August 151 i~61

,L.'.

Rockbit

Rockbit

Limestone - quartzite breccla composed of angular fragments in a calcareous matrix. Contains much manganese. Also contains chrysocolla and chalcocite, which is mostly in upper part. 1% sulfides.

F~ite, fine-medium grainmarble contalning zones of garnet. Fm dendrites strong. No sulfides observed. Some malachite and chrysocolla present.

l Marble zone with 30-45 ° laminations of garnet and chloritic material. Zones of garnet throughout. No observed sulfides.

Marble-garnet zone with laminations 70-800. Contains sphalerite, galena, chalcopyrite, pyrite and malachite. Less 1% sulphides.

Black hornfels with biotite ~ear bottom. 1% sulfides.

Quartz monzonite with biotite and sphene. 1% sulfides.

August 15 -August 31, 1961

-Rockbit through Helmet fanglomerate

hedium grain, biotite~ sphene, quartz mon- zonfte, which is equilgranular. Trace of sulfides.

T-34:

0' - 21'

21' - 30.3'

30.3' " 70.0'

70.0' - 77.4'

7 7 . 4 ' - 245.7'

245.7' - 374.2'

374.2' - 554.5'

554.5' - 705.0'

, ~QP

Rockb it

Caliche cemented gravel.

Rockbit

Jasperoid breccia containing veins of chrysocolla.

~,arble with tactite zones throughout, tactite zones consist of hornfels, garnet and calc-silicates. Trace of sulfides.

Coarse grained, white, marble. Escabrose unit(?). Less than 1% sulfides and carbonates of copper, l

"Tactite with interbedded medium grain marble and hornfels. No observed sulfldes. Laminations throughout. Trace of sulfides.

Biotite, sphene, quartz monzonite of equal granular, medium grain material. Trace of • moly and chalcopyrite.

Septembe r I -September 15, 196!

T-30:

991.0' - 1327.6' San Xavier fanglomerate

Septemb.er 16 -.September 30~ 1961

T-30:

1327,6' - 1659.3' San Xavier fanglomerate

ar

\

T-30:

october I - Oct0ber 15, 1961

1659.3' - 1803.7' Helmei" fanglomerate

T-66 :

0.0' - 275.8'

._July 1 - July 14~ 1962

Helmet fanglomerate

k./

T-66:

275.8' -661.1'

~uly 15 - ~uly 31, 1962

Helmet fanglomerate

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ORIGINAL POS!TtON OF P1MA-MISSION

& NORTH SAN XAVIER 8LOCKS

"• ANACONDA TWiN BUTTES MiNE

,1 5000 -~

2C00'~

ICO0' ~. 1

Q ~ I

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Ar. izono

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, - o ,

LEGEND tt Ool Quo)ernory Alluvium hf . Helmot Fonglornero le

San Xovler end other post-mineral f e u i t s , \

4) POST-)JlNERAt. ROCKS

$ PRE-MINERAL ROCKS

Tp Tertiary Porph,vr~/ Ka Cretaceous Sediments (clestic) rnb Marble

I Pcleozo!c tac TQCtito (sillcQted l imestone) Sediments

Pz Limestone

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2000'

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Arizonc~ 1 i Report by K:.m:~un Richard ,Jcnugry i969 j

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285 The Misdoa Copper Deposit, Arizona . . . L e n g t h o f ~ ; . : t i c . : . 4 O O O f e e t - -'-

v e r t i c a l e x : a g g e r o t i o n /

S U R F ' & C E . , Y . . . . . : -~' .. -.

S a n d end Grove l " j - ~ E ~ m " , C ~ : ' : 2 ( 9 0 : ~ : . !h i 'ok . . . . , . .

"'-.~'.~5 ~-: - - , , - , - ' , - ~ ~ • , , ' - - - , , , - : ,, . , , % , _ ~ . . ~ _ _ . . , . . . ~ ~ - , ~ , . ~ ' ~ . ~ . ~ . , , , x i . i - . ~ ; . ' . ' : . " , : ' ~ ' , : ~ 4 J < . ' - ; : , ; Y o -

%., . . . . ; ,A~x~'" ; . - , . . . . . , : : - :~

- ; ' " - 7 .~"~ • ' " ' " v ' ; ~ P " ~ . : ~ ; 7 ~ ~ i . i ,o(20" : : . / / L - t ' ' , / : . . ;.,-.>.-- )>.,.,,.=.~\\~ ~ ( 2 : . . ~ . . . . . ~ O O o-o",2 " "

" Z L " ~-,.~='Y'=~, " ~ ~ -i-- . . %[ o

~ . ~ N ~ O ~ i '~"

L i m e S i l i c a t e s Q u a r t z i t e M a r b l e P a p a y a f m K i n o f m Q u a r t z m o n z o n h e ~ _ pa r pr~yry

(or ig ina l ly l imes tone) and o rgd l i te E a r l y T e r t i a r y

Po leozo i c R o c k s A r g i l l i t e a n d c o n g l o m e r a t e T e r ' l i o r y

Pius O . 4 % Cu Fzcurt~ 5.~Diagrammatie cross section through the Mis~t,~; o,-:

N O T E : Oxidat ion and en r i chmen t c o n f i n e d to tt] in ~a~er b e n e a t h b e d r o c K , O - 5 0 ' th :ck .

body (looki,,g north).

small discrete grains, in thin irregular veinlets, i-: Sulfide h n p r e g n a t l o r ~

'narrow re~)!acement ~ssures, and as large pods of Hypogene seIflde minera!ization is, from a n eco- massive sui~des that locally assay.5 to 15 perce~at C~. notate viewpoiut, the most important cha~:ge or a l t e r a - •

The hornfels b 'pe commonly is composed of a va r- _ _ [ , , : ,

table hard-to-soft white flne-grained aggregate, ~hic l l ~ . . % ~ ' ~ '¢'~ .... in thin section proves to be eqmgranu . : r dmpsMc . ~ . ~ /, with variable anaounts o[ calcite (as much as 20 per- ..%v~..- "~ . B , ~, oo,,~ . . . . . . :-~;,,,, is a h a r t - reenish variety, wh 'ch . ¢ ~ . . - ~ " . :~!, "

h n section is seen to De compose(l o. stuooy i:~r~)hyr¢ ~ ~ " \ ' ~ " " ' - - ' ~

rismatie crystals of d ops~de The retractwe minces or ~ ", - ~ .' t • ~ ~ %

file ~h i t e ,;ranular variety are slightly higher th.m 1 % ' . , , / " • 0 I % 0 , ~ " . .~ | '.~% . / t t " i~,~, ' ~ i t %', , z - - L i m i t . ~ Of A l t e r o f i o t l those of pure diopside and the prismatzc crystals / :" ~" • ~ ""~ ran~e about midway behveen the indices of hedenber - ~ ~ , r ~ , ~ . . ~t,~,

• ~-, . , , . • . . . . ...,, ~,,~ ~ " 2 ~

rot" and those of dmps~de. Thus, ~ron me~asomahsm ~.- ~ .~; - ~ e ~ . / ~ o oh~i ~usly a major factor in the formation of bo th tt:e ~ .:::: p,,~..~ .:-:- _ e.~, ~̀ / g - . - - s - . - -

.. • " 1 17 , • ~, homfe!s and the andrad; te- tachte previous,y d,e-~,~.,~,, | ;:i' ,'~ .o~, ~

/ - ' ~ , F # ~ "

feature of the hornfels is the p • . • . . . . . ~ l ~ | "%d':" ~ . z U ~ o " ~ at

of hlue-g~een actinolite, commonly ~,iG to 1 inch w~de. ~', • ._ c o ~ . . . . . . . . o,~ but not everywhere, havinK a medially disposed r~ . . . . . . . . .~--. ,--"-~z7~,~. s tr inger of pyrite and chaleopyrite. The actinoh~e commonly is altered slightly to elflorile. Sul~,des ar~- distr ibuted iz~ the honlfels in the same manner as iv:

taetite. As a group, the limv roeks~ tae t i t e and h o r n f e l s ~

consti tute the main source of copper and have a hi~it~r average grade than ore in argiltite, which is the second

principal copper host rock.

enr ;¢hqd I~y Ghc31co¢lle.

,C~.~nt: 6 .~Tota l sulfide coc~tent, Mission mine,

- - , - , - l * , ~ - ' , ~ - ' ~ - - ~ ' ~ ' / ' ~ ' ~ - - . ~ , . , ~ , . . - ~ * - ~ - ~ . - - - ~ . - - o - ~ . . - . , ~ ' : , ~ ' ~ ' m ' ~ ' ~ ' ~ ' ~ - ~ ' ' ~ " ~ - ~ ~ ' ' - ' ' ' ' ~ ' ~ ' r ~ , ~ . ~ . ~ ~ . , , • ~ . r - - -

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~ f s u C c e s s , r e d o w n l h t c w $ ~ ' o f f ect i r , a f r u c t u r e s

Core o f p f r o m l d , o " • "

c e l l i n i b lock l e f t u n d i s l u r b e d by . * - ;"

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....- / ~ / - i r +;'- +_' . ~ I

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• " . • • " " " ' ~ Ol lho domol push • : - : - " : - .<:- .. ,: .? . . . . • l " . . . . " " ~ / • . . - - . • • , - . . , ) , - , - : . . - : ; - i - ~ -

" " " hl~_=s't" ~ . . . i l . " ~ - - 5 0 0 0 1 o ' " t • " " ' " " " ~ . ' ' " , I ' ) - = O k A 3 ~ I -. :

• I I ~ d l $ l U l b e d e z c ~ p l . +.~,e~6,., -:>::;..:. . - . : ~ + ~ / # , / . I ~ • " - -

~ i - ! : : : ": : :::::.':::: "':': : ~ / ~ , / ~ . ~ - 0 COO f t / / [ " " - " " ' . . . . : : : : : : : : : : : : : : : : : : : : : : : : : : ' 2 . ¢ ¢ l j . . . r i # , , / . J , - . . ,

. " "- " - - ; ' % ! ' ~ ~ ! ) 1 d J , e , r ~ E ¢ ] t ~ 4 ~,,_ ~ ~. ,o,, ~o~o, - " - - b / " ~ - ~ - - 3 , 5 0 0 f l I : c - . l l l . : : . . . ~ . ~ . / ~ _ a . - y p , . . .

• . . , ~ " - f ' b . . ~ [ / f I U " 2 D " " .-z ,.~ vy , , -= id , o,. b.oc~<- - _ • " - - " : - " "'+> , " - .-: 1 t, i - ~ . , ~ , . . , , ~ ~ - , : , , , o ~ - . . . ~ o ,

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. , . , . . . . . . . . < - . . . . . : . / . . : . . ~ . . - 1 7 ; > - : 1 ~ ' -

• " : " " ' : ' " " " : ~: :'~.. ' - 'X -~ . . . . , ' " "r,12J 1 ~'--- ~_/0 ~ ~/ Xt,.~ L.' • " " " ~ . "+ .~ . . . . . . . . . , , ' ¢ , ~ . - , ~r , ' - " " " ' - ' " . . . . . ~ - " , / t , d • • • • " ~ • " - " # ~ " ~ • ~ 1 ~ - I ~ , "

" ~ i n l i o u t t h e r , s p e = , , ~ ' • " • " ~ ~ ~ - , ~ / t ~t . . '~. . , . , . l / , , .~j A ' b ~ /~.O " ' • . I f l s p i o c ~ m e n l = o f ; i ~ - , ~ : ; .: i - , ' ~ / v ". 9 ? ' - " v " , , ' ~ i 3 v " z _ I - . _ , b ~ .

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LOGS, E~;ARDS CLAIMS Summari~d from Anaconda d e t a i l e d logs

Hole No. D I06 1551' Banner hole NW/NW 17 No log

281-283o5 0.51% Cu fng(?)

D273 I192' on map, log 757.5' All fng, SW/SWI6 1961 Ann 8ullinger #51 claim

421 925' 0-681 -808 -833 -925

NE/NW 28 all Is, some qte, sit, sandy slt EOH 1/11/65 Broken zone in qte It gry qte, feldspathie (hole re-chafed)

'424 750' 1/23/65 a l l fng SE/NE 20

442 4 7 9 ' 5/11/65 -470 fng -474 ? -479 gar seds .02% Cu

s~/sE 20

(vis ible CuFeS~)

443 1500' 5/3/65 -245 all -1500 EOH 4/16/65 fng

sw/a~ 20

444 1526' E0H 4/20/65 all fng

446 531' EOH 5/5/65 all fn~ Sw/sE 15

450

467

817' EOH 7/22/65 all £n£ SE/3E 15

695 ' -540 -695

br fngC?) ROB 5/27/65 drk & l g t gry I s , l g t ~ 1 brn l s , s i l t y s s , sandy I s to limey as , bu£ Try I s , s l t , e t c . . (no ment ion of skarn)

483

491

869' Fan group ~E/~/ 19 -215 £ng -529 Is bx -578 gar & alt Is, calc sil argl, Cu Ox, Cu2S , bx -484 Is fng, minor to rood CuOx, some Cu2S (?) -869 Gar seds, mnz

776-780 dike, prob QMP w/aph grdms -946 E0H fng

Mnz I 325-578 &v .8-i.0% Cu 481-515 " " " 569-603 " ,75 661-681 " .5

,.~41-869 " .5

727 ' ~/~ 21 -435 aand & g r a w l . ' l~ zoE 4/6/67

R E C E I V E D

FEB 1 3 197G

silty sand7 I., 81t, ete (no mution o£ ekan~)

Logs, Edwards Claims (rout'd)

534 957' a l l fng 12/19/64 SE/N E 17

535 i010' CDH 8 /24 /64 ~,~,/l~ 18 -485 fng ( ? )

-1010 EOll/ eong (fng ?) 12/14/64

582 755' all fng 3/31/66 NE/SB 18

971 1504' all fng NW/SE' 19

975 1246' just N of Dynamite S W / S E - ~ I 9 -309 fng -688 gar & sil Is & slt, loc qtz & chdny stringers, Gu2S & CuFes 2 -812 QMP shattered & alt FeS 2 grt than CuFeS 2 & MoS 2 -1246 EOH fng .~

t~r=: (av a p p r o x ) 309-378 ,8%Cu 378-344 .18 444-485 .75 548-560 .35 568-574 .75 574-61~ ,18 645-695 .7

(485-581 poor core recov)

976 1500 ' $E/SE 19 -158 all -492.5 fraE bx cng of sil gar ls, s o ~ CuOx cement, soma chdny &

qtz masses & seams -1500 £n~

977 723.5' SW/SE 19 -250 all & fng -522 ls cnE -387 I s bx t o cng

-696 q t z g a r k s , l lmey s l t , s l t -709 QM ( ? ) rood to stg alt, weak CuFeS2, t~ace MoS 2 -710 (7) fnE feldspathic qte. trace CuFe32 -723.5 fng mnz : (approx av) 395-403 .25% Cu

567-642 ,5 71.5-723.5 .25

980 1434' Fan Group all fn~ o¢c 6" of .3 - .6% Cu

9 8 1 2111' -2050 -2053 -2073 -2111 ran=:

700' SE of 980 SE/S~ 19 fng b r o k e n QMP, weak GuFeS 2 gar seds

QM foe porph, trace FeS 2 & CuFeS 2 on strlnger8 2055-2055 8.5% Cu gar, near mass GuFeS 2 2055-2061 .5

984 8 6 0 o

-181 -255 -508 -702 -860

~ z z 255.311 _3% e ,

SW/SE 19 a l l & f n g p y r o c l a s t i c s t s£1 & a l t l s t come CuC~ ks cngp some g a r ga r s£1 I s , s i l l i m e y s l t , q t e , a l t s l t (~M p a r t p o r p h t s t r o n g l y a l t t b r o k e n , l o e cb / f n g

z9

Logs, Edwards Claims >nt'd>

997 1363' near Twin Buttes Rd., just NW of SW cot Dynamite -313 £ng -1242 mete s i t seds

-1265 QMP strong K spar flooding, lack of 8 except 1244-1247 -1565 EOR QM looks more like "granodiorite" bio in descrete bks,

not strongly alt mns; approx av 386-390 2.13% Cu

4OO-420 .5 499-520 .4 530--540 .5

1030. 547' ' j u s t sg of SWcor Dynamite - I19 c a l i c h e cng

-199 QM P(?) s t r alt -205 s l t , serp -396 QH P(?) str alt, broken -444 a l t s i t a Is -485 QH P(?) a le -547 seds, some serp, many sl£ps (EOH)

mnz: 199-205 *35% Cu 407-416 ,8

1032 1275 ' -779

-802 -822,5 -1247

- I 258 -1260

-1275 mnzz

W of W side Dynamite one & fn g a l t i s

a i r QMP (?) I s & dol , some a r g l , a l l s i t QM P(?) a rg l EOH QM P(?) looks like Cooper's Eranodiorlte 822.5-868 av approx 1% Cu

1039

1091

752' 200' E of 1030, 300' E of S~ cot Dynamite -125 QM P(?) s t r a l t (-120 fn~) -142 silty is, str alt -373 QM P(?) str alt -390 gar silty Is -595 Q~ sir alt

-5 ~ Ear silty Is -~,:.5 QHP str alt -448 silty Is -484 fault zone -618 serp Is -737 QMP str al~ bx -752 E0H serp Is 9/9/66 m~rm: approx av 118-142 .6% Cu

373-399 .5 419-448 .4

800' Fan #5 ~EW19 -522 cng &fng -722 sit blue gry Is w/so~ qte -800 EOH fng mns~ 525-572 ~13% Cu

572-602 ,26 602-640 ,48

640-703 (602-703 703-722

2.10% Cu 1.49)

°10

(3)

Logs, Edwards Glaims (cont'd)

1107 760 ' all fng Helmet Pk. NE/NW 18

1156 402' all fng(?) CDH Helmet PKo Monday #4 10/26/68 BT;/NW 18

1174 1064' l{elmet Pk, Ann Sullinger #15 SW/NN 18 -572 cuttings 'Washed ~'' 540-572 arkose (br at 340) -717 EOH fn~ -891 and porph, Turkey Track -917 fng

-1064 EOH 1/12/74 gr & she mafic. Notes : Halle intruded by It col equi grn granite, sen chl & kaol, some close to QM less a l t

1183 2514' Tues #6 N of Edwards -79 all (?) -215 Turkey Track and

-1706 EOH fng -1855 fng 2514 EOR bio rhy tuff

NE/NE 18

1200 513 ' NE/NW 21 -386 fng -461 ls & mixed ls-qte bx -515 fOE 4/28/68 ~r, somewhat alt milky felds & pink K spar

w/patchy and/or flakes chl k bio, some Fe0x k Ye304 some bx & reheallng

1202 1594' Elizabeth mine SE/NW 24 -1227 fng -1266 frags Is, qte,gar ark qte in sil~y sandy matrix -1442 mixed ark qte, slt

1415-1424 qtzose limey stringers ~o near mass~%~ FeS 2 w/scat PbS ~ ZnS mixed w~ FeOx

-1451 clastlc tuff frags, reworked -1902 fng(?) qte bx -1548 fng, mixture Is & qte bx -1594 EOH 7/25/68 fng (1502 E0H 6/24/68) mrs: 1230-1259 .14- .56~ Gu

1565- 1366.9 .251 Cu .681 Zn .311 Pb 1415-1424 little Cu ,211 Zn ,211 Pb

1204 915 ' SW/SW 19 .-691 £ng -843 l s

sharp contact -915 fng EOH 8/14/68 mns: 251- 261 ,201 Cu 721-829 o131 Cu

1255 975' All fng 4/I/70 NE/NE 30 near see cot 950-975 Soma Is frags show gar & Fe0~

4

1207 1259' all fhg 9/9/68 S~/SW 19 1060-1065 .37% Cu

829-84.~ 1 .13~ Cu

(ou t o f numer£ea l order )

(4)

1208

Logs, Edwards Claims (cont'd)

1572' ~qT group Midland if6 SE/SE 24 -1262 fng -1331 serp a l t Is -1512 era xl p ink i sh i s -1972 E0H 10/Ii/68 sire alt grd, somewhat bx & rehealed,

bio to ehl, abundant pink K spar, trace S

1209 1363 ' -936 -1190 -I 296 -1563

CNT group Midland #6 SE/SE 24 fng pinkish ors xl Is serp alt silty Is EOH 11/6/68 alt grd , trace Fe304, trace to nil S

1210 1760' C~ group Midland #26 -805 £ng -848 bio porph pyritic and -1617 fng

-1696 ark & ark qte .. -1708 fault zone

-1760 EOH

1218 1015'

-851

-858

-952 -985

-1015

/~E/SE 24

12/20/68 s t r g a l t gr or grd, bx de s t royed t e x t

Emmons #17 ICg/N~ 21 fng b l u g r y l e s l t , 952 s t r g bx c rush ing qte l s

1219 915' -523 -708 -816

- 9 1 5 I n n ~

Fan #3 SW/3W 19 fng blu gry ls, bx to frgmtl bx (?), fng(?) EOH 3/11/72 gar & minor c a l c s i l at&q; Ioc mod to s t r g CuFeS2, FeS2. sctrd ZnS, PbS, MoS 2 ZOit 8 / 5 / 7 2 as above

708-715 5.36% CU 715-862 .16% CU 72t~754 .4 862-915 .97 774-779 .75 a l s o o t h e r spots mnz

1235 (see page 4)

1242 1125' Venus #5 NE/NE 50 -889 fng -1064 ls fng, increase Is akarnw/depth, some qte & clastics

979-994 skarn frgs Cu2S , Cu20 , Cu -I125 EOH 2/21/72 red gng

mnz= 981-1004 .69% Cu

1259 650 '

1308 631 ' 4-197

- 5 0 0 -594

' -631

a l l £ng J58-650 wk to l o c f a i r CuQx E s i d e sec 20 near ~ co t

~ / ~ 21 gry I s , some change m d t o dk gry f o s s i l I s , lower 116' c h e r t y dk to I t gry f o s s i l I s , some sandy EOl{ ss to q t e

Documents

docs.azgs.az.govdocs.azgs.az.gov/SpecColl/2008-01/2008-01-0463.pdf · .F, PHOHE CODE GO2 9~;-4731 EXKCUTWK OI'FKCEB 1270 AVENUE OF TtlE AMERICAS NID, V YORK. N.Y. 10020 PLAZA 7-9700