STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES GMS-35 DONALD A. HULL. STATE GEOLOGI ST Geology and Gold Deposits Map of the Southwest Quarter of the GEOLOGY AND GOLD DEPOSITS MAP OF THE SOUTHWEST QUARTER OF THE BATES QUADRANGLE, GRANT COUNTY, OREGON Bates Quadrangle, Grant County, Oregon 1984 H.C. Brooks and others 1984 Funded in part by United States Department T KMlE ROCK CJHIAIRT Age in of Agriculture - U.S. Forest Service 11s•45• A. 33 E. R. 34 E. 118°37'30" Mill1om 44"37'30" 44"37'30" QUATERNARY H olo, and I a,, I [•.<>I i : ,j of yeors P leistocene :I'-:-:',, Ol!i·;.;.-· 1: Pho, anChalcopyrite and glaucodot are th~ main ore minerals (Vhay, 1960). Saffiorite, cobalt ite, arsenopyrit.e, .. produced from lode mines between 1903 and 1910, when gold was valued nt $20.67 per oz. Historical informat,on and data on b,smuthinite, native bismuth, galena, and sphalerite have also been reported (Gilluly and others, 1933; Vhay. 1960). m iddle a n d lowe r E o, jr,dividual mines are largely from Lindgren 0901 I, Gilluly and others (19331, and Brooks and Ramp I 1968). Incomplete records indicate that about 1,041 oz of gold and 224.741 lb of copper were produced from 8,256 tons of ore during Two types of lode deposits are known in the quadrangle, which eneompasses the Quartzburg mining district: ( 11 generally the periods of 1906--1007 and 19'64-1965. Vhay 11960! estimates that about 10,000 tons of ore had been removed from st.opes in P a leocene narrow, north- to northeast-trending gold-quartz veins: and 12 1 copper-gold-cob-alt veins and stringers m irregularly s haped, the Standard Mine prior to 1960. An unknown additional amount of gold was produced prior to 1907 from cobalt-gold s hipments U p per I ., I generally N . 60°-80° E.-striking quartz-tourmaline replaceme nt bodies Although the gold quart,. veins have been identified in all d production of Late Jurassic and Cretaceous intrusions include small stocks and irregularly shaped masses which range from early equigranular between $400,000 and $600,000 {Oregon Department of Geology and Mineral Ind ustries. 194 ! l . Three distinct ore s hoots with a diori«: through quartz diorite, mon,onite. and granodiorite to late porphyritic dacite phases and which are similar to intrusives llpper JI "' ~ combined length of about 350 ft have been mined out above creek level The vein, which ranges in width from that of a knife-edge related to mineralization in productive porphyry copper districts. Porphyry-type mineralization is suggested by the presence of JURASSlC I i to more than I ft , strikes N . 35' -45' E., dips 75' -80° SE., and is composed largely of quartz, dolomit.e, and massive s ulfides. including large silicified zones w ith disseminated sulfides in addition to widespread areas of clay al«:ration and discontinuous zones of t:l tourmalini,.ation. The disseminated sulfide cont.air, stringers and disseminations of pyrite pyrrhotite ;r, silicified Midd le a nd pyrite, chalcopyrite, galena, and sphalerite {Gilluly and others, 1933). The vem cuts uralitized gabbro near a contact with zones and :,; meta-andes ite. Other small producers in Lhe immediate area include the Present Need (47) and Keys tone •241 Mines. met.a-andesite and are intimately associated with altered dacite porphyry dikes. Three samples from the zone in secs. 35 and 36, L o we r ? More than 7,200 fl of workings st the Dixie Meadows Mine (6 ) explore a wide breccia zone m s heared argillite and serpentin1te T. 11 S., R. 33 E .. contained !02-357 ppm of copper and 6•25 ppb of gold; two samples from the zone in sec. 5. T. 12 S., R. 34 E., which parallels a major fault contact between n,eta-andes ites 1unil 'liPdbJ and a complex of intercalated argillite and ultramafic contained 119-125 ppm of copper and 6,380 ppb of gold I Ferns and others. 1984a). TRIASS]C rocks. The zone is locally intruded by dacite and post-mineralization andesite dikes and is cut by unaltered daci«: porphyry on Cobalt-gold minerali zation along fractures within the t.ourmahne zones preceded the high•grade chaleopyrite s tringers (Vhay. the southwest. The minerali2ed part of the zone s trikes N . 30°- 35° E. and dips 65°-70' SE. The breccia zone is up to 60 ft wide. of 19601. Younger nort herly-striking gold-q uart.z•calc,te veins IO<'ally cut across the tourmaline zones. A Tertiary episode ofhydrother­ li Pdb which about IO fl is quartz vein fil!ing. Most of the zone ia a rgillite and other country rock, partly replaced by quartz. sericite, mal alteration is indicated by s mall siliea- and elay-rich zones within the calc-alkaline volcanic rocks. and sulfides, includmg arsenopyrite, chalcopyri«:, pyrrhotite, galena, mares.site, and pyrite 1Gilluly and others, 1933). Channel and terrace gravels along Dixie Creek in secs. 23 and 26. T . 12 S . R. 33 E., were the most productive placers in the ,l Copper-cobalt replacement bodies are best developed at the Standard (361 and Copperopolis 129! Mines, where they occur a s Quadrangle. The es timated production from Dixie Creek upstream from Prairie City, which lies about 3 mi south of the quadran gle L-?- narrow subparallel and branching veins and stringers of quartz, calcite, and s ulfides in broad, persistent zones of hydrothermal boundary, was between $0.6 and $6 million prior to 1914, with the lower figure probably nearer the true one !Swartley, 19141. 1§ PERMI AN alt.eration that strike N . 60'-80° E. The alteration zones, which range up to 75 fl in width and over 2 ,000 ft in length, are largely Floating draglinedredge operations in the immediate area produced an estimated 22,500 oz of gold during 1930-1936 and 1938-1 941 composed of a dark-colored '"hornfelslike" mass of fine-grained tourmaline and quartz iGilluly and others, 1933 1. The St.andard !Brooks and Ramp, !968). The total placer gold production from Dixie Creek within the quadrangle is estimated at about 6,500 w ""' vein rsnge,i from a f~w inches io 4 fl in width and consists mainly of quart2, with lesser amounLs of pyrite, carbona«:, and oz of gold. Some s mall-scale plaeer mining has been done in parts of Ruby, Sulphur, and Butte Creeks. d PIRE-PEIRM! AN l?I il:; GJ - Table 1. MINES ANO PROSPECTS IN THE SOUTHWEST QUARTER OF THE BATES QUADRANGLE Map M1neor Oua,1er Township Range Ei-evation Geotogir; EXPLANATION oo. p,ospec! name seclion Section (South) (Easl) (It) !ormatron GeolOgic description Surlace and/or underground worl< lngs Past p,odcx:tkm References 1. Nameunkr,own KJi Zone ot Dteacned Quanz diorite with quam stringers Shallow cuts and trenches Alluvium (Holocene a nd Pleistocene) - UJ>consolidated, poorly sorted lluviatile depos,t,i cotlsisting ofgrovel. sand, silt. snd pyroclastic mat,,rial in channels ,,nd and rare pyrite Qal fl()(),1 pfams of!he present druin,,ge sysiems 2. Name unkr,own " 4.720 ., Quartz stringers with calCile and 1a1c :WO-!tad1t Nooe? 3 B,g Bu!te 4.520 ., Chrysotlle stringers m massive serpen~nita Surface cuts ,oo, Landslid e de bris (Holocene a nd Pleistocene) - Unstratified, helerogenecus mixtures or soil and angular rock fragments resuliing (rom be;Jrock failure on Asbestos •• ,.._I., 0 ; over.,/eepened slopes; typified by hummocky topography ' ~ "1 0wn •.800 l\Pdb Iron-stained calcite veins with ma"9anese OXee, ,w 5.400 3·h wionate s1,ing­ About 500 11 of workings ,oo, Td silicic andesite flows. tuffs, domes, and small intrusives. Include" aphanitic to porphyritic, locM/y platy rhyodacite flows, tuffs, and breccias in ,;ecs. 27 and 28. T. 1 J S., JMsenGroup " ers strikes N. 60" E., dips 60" S. I I R. 33 E. , ,1nd sec. 17, T I 2 S, R. 34 E. Porphyritic hornblende dacite in sec. 22, T. 11 S .• R. 33 E., and sec. 11, T. 12 S., R. 33 E .• contains up to 15 percent phenocrysts, 8. Name unknown " 5,540 LimoniticQuarlz stringers in alte red po,pr,yritir; dacite Prospect p11 including plagioclase, quartz, bw!ite, and bornblende up to 2 mm long, in a cryptQcrystaJ/ine fel.~ic matrix. Silicic andesites conu,in up to 20 percent phenocrysts, 9. Name unknown ,w" " 5.480 Shear zone with quanz and sulfifracture zone Shon adit ,oo, black olivine basalt and lighter colored dacite and silicic andesite flows. Locally mc/udes dacite and rhyodac1le dikes. Andesites range from platy to massive, are 13. Nameunknown " .. 6,200 flPdb" L1mon,tized shear zones strike N. 40° W. Larga dozer cut ,oo, locally vesicular. and contain up t.o 10 percent phenocrysts, including plagioclase, hornblende, and augite_ Rocks oft.his unit locally overlie and interfinger with rocks 14 Nameunknown ,w .. 6,280 ,.. Nor1heast-1'andlng shear zone wrth s1'1ngers ol sulf.c!e ­ Prospect pits ,oo, " bea ring chalcedony of unit Tvs. Basalt from this un,t immediately en.st of the quadrangle boundary in sec. 11, T, 12 S .. R. 34 E., has yielded B K-Ar age of 41 . 7 ± 6.0 m.y. !H ebelkorn 15. Black Prince, ,w .. 6,320 flPdb OuarlMourmalina raplacemen! zone containi"9 pyrite, o,e, 900 ho! workings in three a<1i1s None? and others, 1982) Prindle !~e;~~li~e, chalcopyrite, spMlerite, covellite, • - --, ,--,- , Volcan iclastic rocks (Oligocen e a nd upper Eocen e ) - Predominantly volcanic mudflow deposits with irregularly intercalated tuffaceous conglomerates, bedded 16. Name unkr,own .. 6.500 L1moo1!ized shear zones Shallow shalls and pits None ; J"ryS ~ luffs. thin welded tuff, tuffaceous sandstones and si!tst.ones. and minor amounts ofmterbedded basalt and andesi'te flows The generally poorly consolidated vo/can,c/astic 17. Di~ieMountain SW .. 6,800 ~~~~-~~~::';;'.ew"fe"_""ment zone with minor copper Shallow pits ,oo, Group " " deposits consist of poorly sorted, subrounded to subangular volcanic rock fragments up t.o 3 fl. in diameter iJ> a matrix of felsic volcanic asJ,, sand, and silt. &,ck ' 18. Wagonwheel " .. 6,400 Braccia zone with pyrite, tetrahednte, chalcopyr,1e, Two sho,i adits and numerous p,ospect cuts Small amoun! of S0wn 5,500 l\Pdb Pyrite and m,n01 cnalcopynte ,n s ll1cifieo and se11cit1ZM Shonadil zone s!rikes N. 70 " E. . dips 75 " SE. rocks, and flows. Poorly consolidated, poorly sorted conglomerate with thin silicic tuff layer.i forms base of section in seca. 18 and 29, T. 11 S ., R. 34 E.; clasts are 21. Name unkr,own " 5,520 SMar zone containing llmonnic gouge. calci1e. and Two sr.on adi!s Nona ' mainly chert, argillite, meta-andesite, and quartz diorite. Quartz dwrite boulders range up t,, 15 a across, and chert c/asts typically are less than 1 in. in diameter chalcedont s1rikes NE . and well rounded. Bre.:cias consist mainly of angular fragments generaJ/y less than 1 in. across of porphyritic andesite and minor dacite and are gradational with Name unkr,own " •.800 Shear zone containing limon lt1c gouge an rocks of unit l\Pdb and overlain by rocks of unit Tab. Absence of Tertiary clasts indicates deposition prior to Tertiary 27. Andrew Jackson 4.760 l\Pdb Two Quam and gouie seams 3 ln. w"1e strike NE . Two shOn ad1!s ~--~~-' vo/cani~m in the area 28 . Slierbandy l\Pdb, JI Pyn1e and copper su fid&1J in quanz-tOurnl.ll li r>e replace­ Less than 400 11 or unde,ground workings 4,5,8 •= ment masses and In narrow quartz-serocite and '·' Sandstone a nd con g lome r ate (Upper Cretaceous)- Grayish-brown to buff-colored sandstones, conglomerates, and shales. Sandstones include immature subarkosic clay-rich fracture zones 29. Copperopo!is 4,920 l\Pdb Ouanz-tournl.ll l, ne zone with scanered pods o! pyr11e , 0.-er 1.500 tt of w01klngs Small? 1,2,3,4.5,7 Ks arenite composed of subrounded to subangular fragments of quartz, chert, and feldspar in limonitic day matrix. PaJ,..brown. medium-grained sandstones in SW ¼ cllalcOpyri!e, magnetite. hematite, coball~e. molyb­ sec. 11. T. 12 S.• H. 33 E .. aJ>d NE¼. sec. 15., T. 12 S., R. 33 E., contain abundant megafossi/8 of &ite Cretaceous (/ate Cenomanian-Turrmian) age, including the gastro­ denite, !etrahedme, boaledte pods Acteonina sp. 11nd Gyrodes sp. and pelecypods Ca!va cf. C . regina Popenoe andCymbophora gabb11111a Anderson (J. W. Miller, written communication, Apr. 4, 1984) s1,ikeS N 60 " E. 30. Name unkr.own ,w 5.360 l\Pdb. JI Small easl-stnking Quanz-toormal1ne zone Small pits Complex o f small intrus ives (Lower Cretaceou s) - Includes porphyritic and minor non porphyritic hornblende and biotite diorite, quartz diorite. granodioriU!, and 31 . Name unknown SW 4.840 L1monitic silicllied quartz d,orite SMr1adi1 minor aplite consisting of fin,..grained quartz and feldspar. Aplitic rocks are cul by quartz seams 0.05 to I in. thick. Green horJ>blende from porphyritic diorite in (Gold Issue?) ' " " "' Ki 32. Boulder Group ,w ' " " l\Pdb Veinle1s ot quartz. calc11e. and sul!ldes 1n a wide, About 1,000 It or work,ngs on two le,els I" S W ¼ sec. 23, T. II S., R. 33 E., yielded K-Ar age of 135.42:t-l.5 m.y. (R.A. Duncan, written communication, Feb. 17, 1984) • ,.ooo " " eas1-wes1 striking zone of s ilicmca!k>n contain pyri1e, '·' Dik e complex (Cretaceou s and U p per Jurassic) - Complex of closely spaced porphyritic fe lsic dikes and irregular small intrusive bodies; typically composed of a rsenopyrite, chatcopyrite. sphalerile. pyrrhotlte, and glaucodot abeut 30 percent phenocrysts ofoligoclase up to l cm long. partially resorbed quartz. and hornblende and biotite up to 2 cm long in cryptocrystalline felsic groundmass. 33. Name unknown •.800 'JtPdb L1moninc silicified greenstone wHh disseminated pyrite 200-lt adit ,,oo Many dikes are hydrotherma//y altered; igneous textures have been obscured, and primary minerals are repla,'00 by quartz, sericite. calcite, epidote, pyrite. aJ>d 34. WoodsKle ,w l\Pdb Limont11c gouge zone SMrtad11 ,Ooo pyrrhotite. Most dike~ probably are genetically related to larger UpperJurassic and Creu,ceous intrusives; some may be related to late Eocene-.1s. strikes N. 70 " E., inchnad shalt removed. Incomplete reco,ds indi­ diorile in sec. 14, T. 12 S., R. 33 E., gave K-Ar age of 146± 7 m.y. rPiebelkorn and other.i, 1982) " and dips stee~y sou!h. Ore minerals Include pyro!e. ca1eabout 1.041 oz Au and 224.741 chalcopyrlte. arsenopyri1e, cobalme, glaucodo1, lb Cu were produced from 8,256 Altered intru s ive rocks (Upp er Jurassic) - Composite intrusives ranging from leucocratic gabbro to granodiorite. Gabbros are hypidiomorphic--granular and bismuthinite. nati,e bismu1h , galena. and sphale,He tons ol o,e durlng 1906-1907 and composed ofura/itized augile 11nd lllbrt,dorite. Diorites are hypidiomorphic-granular and contain oligoclase, uraliti?.ed augite, andesine, quartz. and occasional bornblende 1964·1965 or bioti~ Gn,n<>ri•- ,.,.., ,_,,pfoa!ly u/1<,tri<>,,,~,phi<>-gr,mo,J,.r •nd "'mt.,in <>lig,;dda•, l,,;,rnl,land•, quart~. 1>nd p;,tamoiu,n f,,Jd,.,...r. M,.fic ,,.;,..,,.,.J,. are .,,..,,.11_,, partly 37. O,ev<>r C1<1,e1and Vein. RPdb Shear zone up 10 1O Mwide contains quart> , gouoa. and 1.300 1, of drihs Small 1.2,3,4,5,6,7 Standard Group pyrite and Strikes N. 15• E. or Numerous replaced by chlorite and actinolite epidote, actinolite. and calcite. similarly altered andesite porphyry, quartz diorite, and mol17,0nila dikes cutgreensl,me 38. Smuggler Vain, " " 1\POb N. so• E.-stri kin_g quanz tourmaline zone con1ains Short &Chi and shallow tica tion. Mar. 6, 1984) " " 15• E. '·' Dixie Butte M e ta-andesite (pre-Upper Jurassic to post-middle Pennia n ) - Predominantly green t.ogray. locally red andesite flows and subordinate volcaniclastic 40. Name unknown 5.480 flPdb Shear zooe with quanz, gouge layers, and pyr!te sTiikeS Sl'IOn ad1ts and shallow trenches N. 10° E. ePdb rocks with minor smounts of dark.gray bas,ilt and pal,..green silicic flows and tuffs, all metamorphosed U) lower green.schist facies. Includes andesitic and silicic dikes 41 . OixieOueen " " 5,120 RPdb Narrow shear zones with quartz. gouge. and breccia 200-11 crosscut None locally. :Wost ,mde-sitic rocks contain relict augite and are porphyritic with plagioclase phenocrysts up lo 3 cm long locally. Metamorphic mineral assemblages include " strike N. 15 ° W.-N. 15 ' E. '·' chlorite+albite +calcite+zeolite a11d cl,/orite +albite+actinolite. Age of unit i.s discussed elsewbere on this map in .section called "New S tratigraphic Name. ~ 42. Cougar " ,.ooo flPdb Narrow shear zone contains quartz. gouge, calcite, Short dflM . adlts. antercalated with serpentinite al lhe Dixie Meadows Mine (6!. Rocks along the contact with unit KJi in sec. 14, T. 11 S., R. 33 E., are converted to quartz-biotite M;dn1gh1. " 10° W. and N. 10°-25° E. and contain calcite string­ '·' horn/els, Early Laie Permian (early Guadalupian) radfo/arians were identified in chert from an exposure on Dads Creek road about 200 ft easl ofquadrangle boundary Minty Group " ers and minor quartz, pyrite, aM chalcopyrtte in sec. 9, T. 12 S., R. 34 E. (C.D. Blome, oral communication, Dec. 28.1983). 'faxa reported include Follicucu\lus ocholasticus Ormiston and Babcock (1980), Follicucullus 45 . Name unkr.own 4.520 ,~. Narrow s llicif1ed shea, zone strikes NE . Shon adi! None 46. Lillie Jane " " l'IPdb Narrow shear zone Short adi1, surface cuts None ventricoaus Ormiston and Babcock (1980!, and undeocribed Pseudoalbaillella sp. This unit oorrelates in part with Elkhorn Ridge Argillite and with rocks included in 47 . Present Need " '•·.""800 l\Pdb Quartz vein up !o 3 It wide contains pyrtte. ma,casite. over 500 It or workings Small 1,4,5 unit 'IU'a by Brooks and others (1983) and Ferns and others (1984b) " " chillcopyri1e , s ehalante, and galena. strikes N. 20 " ' " e., and d•pS 70 SE. Serpen tinite and serp entinite-matrix m elange - Includes massive black t.o greenish-gray serpentinized ultramafic rocks near head of Ruby Creek in soc. 13, 48 Keystone 5,040 l\Pdb 4-11-wicle l1monlt<: sil1c1~ed shear zone str,kes N. 10 ' E.. Severa l hundred lee! cl workings Small T. 11 S., R. 33 E., and sheared dark-green to black serpentinite and serpentinite-matrix melange in sec. 24, T. 12 S. , R. 33 E., and sec. 21, T. 1g S., R. 34 E. The melange Ex!ensoon " dips 75 " SE . • 49. New Deal " " RPdb Umonilic silicifjed shear zone stnkes NE. 200-h adi1 UnMown consists of chaotically distributed blocks and slices of argillite, chert, greenstone, and gabbro that ,ire too small to map separately in m,itrix of sheared serpentinite. 50 . Buck Gulch " " '•·.""800 'I\Pdb Hema1i!e·l1lled fractures in shear zone stnke N 500-ltdrilt Small Small slivers ofserpentinite hBve boon emplaced along Tertiary faults in SW¼ sec. 17. T. 11 S., R. 34 E. 51 . Haley " " •.800 'JtPdb 2-M-wide stiear zone strikes N. 20• E , dips B5 ' SE. in 35-!t shalt and 150·ft crosscut Small ' " " zone of dac1ta porphyry di kes in greenstone ' 52. No,thS1af ,w" .. " 'JtPdb No,iheas!-striking shear zone with quartz. gouge, and Several hundred feet ol wo,kings ' - NEW STRATIGRAPHIC NAME breccia '·"" 53. Name unknown " 4,440 , .. Northeast-striking siliciflad zone Prospee1 pit The Dixie Butte Met.a-andesite is here named for Dixie But«: in sec. 28, T . 11 S .. R. 34 E. The type area is the west slope of Dixie Butte including upper ports of 54 . Name unknown ,w" .. 4,320 sp, l\Pdb Ad11 crosscuts contact between 9,eens1one and se,. 200-lt ad1t Standard Creek and Dads Creek in the southwest part ofT. 11 S., R. 34 E. , and the northwest part ofT. 12 S., R 34 E_ Maximum thickness is about 7,000 ft. On Dads " " pen1inite 55. Forrester Group ,w " 4,400 KJ1, l\Pdb 1' t;-h-wide shear zone along contac1 ol a ser.clt,c dacite 4,5,9 Creek in SWV. sec. 9. T. 12 S., R. 34 E ., the lower 2,000-2,200 ft of the formation consists of thick-bedded andesitic lithic tuff, tuffbreccia. and tuffaceous sedimentary .. Over 500 It ol work.1ngs porphyry dike in quartz dionrn and greens!one rocks. Rocks in the lower part of the tufT section contain raunded fragments of chert and argillite. The upper part of the fonnation is made up mainly of massive Ophir, ,w " 4,460 KJi Shear zone containing a lte,ed quartz d1orite and 1,500 Uol wo,k1ngs Unknown 4.5,9 plagioclase-phyric andesite flows with minor amounts of andesitic tufT, dacitic flows and luffs, and basalt. Forrester Group " porph)"iUc dacote 011ed fauh zones strike N. 15• W., dip 85" E. In Trenches. pits, and shon adits Unkr,own A marked angular unconformity separntes the Di~ie Butte Meta-andesite from overlying rocks of Cretaceous snd Tertiary age. Neither the age nor the relalion~hip " hornlelsed and s1 l,c1l1ed greenstone of the formation to associated older rocks is definit.ely known. Rocks of the fonnation are in cont.act with te<:tonically juxtaposed argillite (unit Ta.Ps) and serpentinite HoWeh and sho,! adit None ., 1u11it sp) in the northern and sou them parts of the map area and a short distance ea.st of the map boundary. These relationships suggest that either the volcanic pile Haight porphyry dike in groonstone " " 4,360 was depos ited on U:rrane of which the argillite ,;erpentinite are a part it is a tectonic block which is encased within or resting up:m the 11rgillite-serpe11tinit.e Name unionacaous argi lhta Sho,tadi1 ,oo, and or Name unknown ,w ,. 4.160 Shear zone in serpentini1e Sh011 ad,t None terrane. The tufT sequence on Dads C reek is s tructurally concordant with middle Permian chert beds (unit 'itPs), and chert. fragments are incorporated into the tufT. Name unknown SW " " 4,080 2-ft-wide zone ol chalcedony strlnge,s In sarpenllnite AboU1 500 It 1n IWO adi1s plus surface trancnes None These factors indicate that the formation is depositional 011 the a rgillite-serpen tinite tei-rane and therefore of post-middle Penni an age . Rocks of the fonnation are Dixie Creek NE.SE " " 3.840 Chanr,el and iritxuaries of Dixie Creek ll!>OU11¼ ml cl channel dredged Small 1.2.3.4,5.7 intruded by diorite (unit J i) of Late Jurassic age. Thus, existing evidence indicates that Dixie Butt.e Meta-andesite was deposited during the interval between middle placers Name unknown ,w" " " Terrace gravels Small area placered Small Permian an"d Late Jurassic. The scarcity of sedimentary layers or other evidence of extensive breaks in the continuity of volcanism suggests that the volcanic rocks " " '·""' were deposited in a relatively short time during that interval. REFERENCES Nearest exposmes of mcta-andes ites of comparable thickness, composition. and degree of metamorphism are in Clover C reek Greenst.one of Early Permian and Lat.e Triassic age, more than 50 mi northeast of Dixie Butte. Ande~ite flow5 and tuffbedll are aloo i_Qt-erlaye~ with ,.,,dimenl.ary rocks in several U pper Triassic and Lower 1. Lindgren. W., 1901 , Thagoklbel1 ol!he Blue Moumainso! Oregon: U.S.Geological Survey Twenty-second Annual Repcn, pt. 2, p. 6. Vhay. J.S., 1960. A prel1m1nary repo,t on the coppe,-cobal! deposits o11ha Ouambutg dls!nct U.S. Geological Survey Ol)On•File Jursssic formations in the John Day inlier, which is southwest of Lhe map area Dis tribution of andesitic tuffs and lava nows in the Uppe, T,iass.ic(?) Fields Creek 55"1·776. Repon 60-143. 20 p. 2. Swartley, A.M., 1914, Ore depos,ts of nonheastern Oregon: Oregon Bureau Of Mines and Geology, Mineral Resou,ces of Oregon, 7 , Brooi< s. H.C. . and Ramp, L., 1968, Gokl and silver In Oregon: Oregon Oepanment ol Geology and Mineral Industries Bulletin 61 , p. Formation suggests that major volcanic centers were to the north (Brown and Thayer, 1966b). v. 1. no. 8, 229p. 148,153 The formation was called the Dixie Butte volcanics by Johnson (1975), but the name was not formalized. The name Dixie Butte M eta-andesite has been reserved 3. Parks, H.M.. and Swartley, A.M., 1916, Handbook oTttie mining industry of Oregon: Or&eral lndustr,es Bulle!in 61 , p_ 146-153. Geotog,cal Survey Bulletin 846-A. p. 85-105. Broold A,ery. D.G .. 1983, Geology and gold deposits map Johnsoo, F.R., 1976, Geology ot the Quanzburg mln"'9 dlslnct. Grant County. Oregon: Corvallis, ol lhe rortheasl Quarter ot lhe Bales Q...ad,angle, Baker and Grant Counties, Oregon: Oregon Oreg , Oregon State Unive,-$ity maste-r's thesis. 102 p. Department ol Geology and Mine,al lr>dustries Gr,ologir;al Map Series GMS-29. Lindgr"'1. W , !901 , The gold bell ot 1he Blue Mo1,m1ains ot Orvgon: US. Geological Su""'Y Twenty• Table 2. CHEMICAL ANALYSES OF ROCK SAMPLES" T. 12 S . Brown, C.E.. and Thayer , T.P., t966a, Geologic map of 1he Canyon City quadrangle, nonheastem second A.nnS quadrangle, Oregon: Eugene. Sample SiO, A1 ,o , TiO, fe,O, c,o M,0 ,,o Na,o P,O, ¼ Sec. T.(S .I A.IE-) Rock type Map unit - - - 1966b. Gr,oiogil; map of the Mount Vernon quadrangle, Gram County. Oregon, U.S. Oreg., Unj,,ersity ol Oregon mas1e-r·s thesis. 66 p. ""' 72.55 16.00 0.24 '"1.37 0,04 2.49 0.11 • 00 0. 11 ,w .. Dae~• Geologir;al Survey Geologic Ouadra"9le Map G0-548. "o Oregon Oepartmer,t ot Geoo:>gy and Mineral Industries, 1941 , Oregon me1al minas h­ ' 72.83 16.42 0.20 1.45 0.02 2.11 o.ro '" 3,71 0.12 ,w " .. " Oaci1e '" Ferns, M.L, Broole Bourne. Ml. Ireland, , (northeaste-rn Oregon, wes\ half) : Oregon Depanmerll ot Geology ar>d Mlne,al lnduslnes 69.12 15.40 1,60 ,,, 4.17 1.57 3,47 0.12 G,anodiori1e Gre.-nhom, Granite, Bales NE, Bales NW, and Batl>S SW 711.1-ITIdustroes Open-File Swanley, A.M.. 1914. Ore depos,ts ol northeas1em Oregon: Oregon Bureau o! Mines and Geology, '°' o... ,w " .. " " Report 0-84·3, in p,ess. ,' . 55.49 16.85 1.40 '" 0,14 4.22 0.79 O.,S " Andesite Mineral Resou,ces o1 Oregon, v. 1, ""· 8,229 p. "' "''" .. "' Fems, M,L, Brooks, H.C., and Wheeler , G.A. . 1984b, Geology and gold or! 60-143. 20 p G'·. 53.18 15.62 0.65 3.76 "'4.31 "'0.15 10.23 '·" 0.74 "' " .. " "" M1 naral Industries GeologM ,~"' 0.18 ,w " " Dacite di ke "~ F,ebellrite ,,'"" 40p. "' " " " ,. 72.27 16.07 0.21 1.19 0.07 '·" '0·."19 1.28 "', 0, 0.10 " " ,. "M Daci1e L 55 25 1887 4.22'" 0.14 "'6.79 0.30 " " .. M Greenstone '"l\Pdt, M. 54.12 18,65 "'1.56 '"3.94 4.51 0.12 '"',.oo '"Q,97 '" 0.65 " " Olorite ,, MAP SYMBOLS 67,58 16 59 0.69 2.42 2.77 0.10 "'3,76 0.47 2.12 "'3.22 0.27 ,w" '• " "M Dacite dike "~ 'o . 72.24 1668 ,.~ 0.97 1.1 1 0.03 2.97 0.43 3,81 0.10 ,w .. " Oacite ------contact- Appruximately located ,. 59.79 17.95 0.8' ,.., 3.93 0.14 ,., 1.96 1'".17 3.82 0.35 " " Anoesite ,'".. G. 50.04 1527 1.16 4.47 5.12 0.17 10.88 10.24 0~ ,,, 0.19 " .." " "M OliV1ne basal! ____L. - - Faull - Dashed where approximately located, ball and bar on down thrown side R 77.3 \ 13.02 0.11 1.13 0.02 1.37 00, 2.58 OM ,.~ " " M Ahyodaci18 "" S." 53.63 20.49 0.59 '"2.40 2.75 0.10 11 .15 5.58 0.24 2.98 0,0 " M" " M Ok>r~e ,,'" - --~-- Quartz veins a n d s h ear zon es " " · All analyses by X-ray fluorescence at Washington State Unave,sity un

10 Mine a n d prospect location - Numbers correspond to numbers in Table I ■

Tdt Tas 5 ,000' ePdb Ji Ji e Pdb ePdb 44"30' R 34 E. 4,000' 11a~4s· A. 33 E. SCALE I 24 000 Base Map from U.S.G.S. 15 Series (Topographic) enlarged to 7½' scale 1 :24 000 l 0 I MILE B ' C B Tab c· Conlrol by USGS and USC&GS • 0 1000 FEET Geology by H.C. Brooks, M.L. Ferns, and D.G. Avery Topography from aerial photographs by multiple~ methods "'"" """' '""' '""' """ Field work completed in 1983 5,000' Aenal pho!ographs laken 1946. Field check 1951 KILOMETER Ks ' Map reviewed by J.G. Evans ,e, Td Polyconic projection 1927 North American datum Tab 10,000-foo! grid based on Oregon coordinate system, north zooe. CONTOU R INTERVAL 40 FEET and G.R. Wheeler 4,000'- > 1000-meter Universal T1ansverse Mercator g rid ticks. Ji zone 11 . shown , li Pdb ? Tc Ki Dashed lar'ld lines indicate approximate locations u• ~ ~••o ••C '"' ~"""" "° •o•,~ Qu•OUMGU lOCAHON ? l\Ps f O(CU••" O• AT C[• r,• o, '"'" 3.000'