ST ATE OF OREGON GEOLOGY AND MINERAL RESOURCES MAP OF THE MT. IRELAND QUADRANGLE, BAKER AND GRANT COUNTIES, OREGON G M S - 22 DEPARTMENT OF GEOLOGY AND MINERAL INDUS TRIES DON ALD A . HULL, STATE G EOLOGIST 1982 MINERAL DEPOSITS

118 4 22'30" 44"52'30" ,. Gold and silver from quart.7. vein and placerdeposit.s have been the .111.llln mineral productsofthe quadrangle, which covel'8moatof senopyrite, and rosc.oelite. At the lbelf. .and Bald Mountain Mines, t h.e gold is about 30 percent free. The rema inder is in J!,Ulfide miner­ the Cable Cove mining district and parts of the Crack.er Creek and Granite districts. Usinghistorica1 values for gold and silver at the als, which. include arsenopyrile, schwatrite (ml:!rcurial tetrahedri tel, and secondary cinnabar. Pyrargyrite and native .'!i!ver are found time of mining, total value of the output from mines in the quadrangle has. bee.n about $1 .2 million, with the bulk of the production loca.lly. The llU lfi de minerals ge. ner.all y comprise less than 6 percent of the ore. The ratio of gold to silver varies but averages t1bout coming from mines along the Eald Mountain-Ibex vein. 1:10. 'fKMJE R.O>C K CHAR.'f In addition to gold and silver, small amol,lllta of lead, :cine, and copper have been li'/Covered as by-producla from the complex sul· phide ores in the Cable Cove district. Low-grade chromite deposits also occur within the quadrangle. Cable Cove dlstrlet Holocene Oal • Known mines and prospect!, 8N! located on the map by numben!, that correspond to the Ii.at of names and locatioms in Table 1. Be­ In thti Cab lo Cove district, a brood ~one ofnorthoost-tronding fiM;uro voiruJ. cuts gnmodiorito and, in a few plaoos, hornfelaed orgil­ Quaternary aod I I I Ogm cause of time oonst.raints, some mapping traverses were as much as half a mile apart, and it is likely that Infill.JI small veins a11d pro,:i" lite. The veins for the most partoonai.stofbrec.ciated granodiorite whieh locally has been alterf!d largely to claymine:tals IUld sericite I per:t excavations. were not obs.erv,;,d. and impregnated with lenses and streaks of quartz., calcite, a nd sulfide minerals. Gold values are erratic and are generally confined to Pleistocene <.,) those portioru! of the veins ri ch in pyrite. and 81'88nopyrite. Galena, sphalerite, chalcopyrite, and atibnite are present locally. At the ~ Bald Morultain-Ibex vein Red Chief(63) and Bladt Dwarf(62), molybdenite occurs in qu.artz vein\ets adjacent to the main fissures. 0 P6ocene The most productive I.ode gold deposits in the quadrangle are along the Bald Mountain-Ibex vein. Although not continuowly ex­ 'l'he Eagle vei,Q (65), the lwge5t. k.noWD vein in the district, att.ain::, widths up to, 25 ft.alld is traceable for more than 2 mi (Lindgren, 5' N posed, the vein ill traceable for about 3 mi by mine and prospect workings including, from eo6t to wc;;t, the Mammoth (40), Belle of 1801, p 673). The Ciible Cove veins pinch and <:,wel l rapidly and in placefJ $plitoff into e,.>1:.$ of generally p.,r11.llel li$SU~, e.g., the Im­ 0 -•oo Bak.er (41), Grand Trunk (31), Bald Mountain (29}, and Ibex (28} Miues, Produc tion records are scarce. Hewe tt. (1931, p. 32 1) esti­ perial (66) and Winchesler (68) veiru; (Swartley, 1914, p. 140). z ,, mate, production from the Belle of Baker .at $400,000 and the Mammoth pt $4(1,000. He credit:3 the 13t1 ld Mount.8-in and Ibex Mine6 Production records for thedi6trictarescarce, but total production is believed not to exceed $200,000. The bulk ofthereoorded pm• 1 Td I Trd I Tb I Tgt 1 t,J Tertiary with "small" production . The present owners ei,timate t hat between 30,000 ;md 35,000 tons of ore have been removed from stopes in duction was from the Imperial-Eagle (66), Califomi.a (71), and Last Chance (-67) Mines. u Oligocene the Bald Mountain and lbe::ii; Mine&. It is not likely thatoreaveraging"leae than 0.30 oz gold/ton would have been mined, and therefore J2-J7 a minimum estimate of output from the Bald Mountain and.Ibex Mines would be9,000 oz.of gold. Production (rain the Bald Mountain Placer deposits Eocene Two dredges have worked in the channel of Bull Run Creek. The Wethe-rall dredge worked the Haystack Meadows area in 1910- 54 Mine in the early 1970's was 1,452-oz. of gold and 19,654 oz of silver from 4,044 tons or ore shipped to smelten. Paleocene The Bald Mountain•Ibex vein is si milar in eh.araeter to, although generally narrower than, the North Polc•Columbia lode and 191 l , and the Porter Brothers dredge worked from the mouth ofSwampCreek downstream in 1939. Tola] production fro m t.h8880p@r• 65 =sists ofirregular bands and lenses ofsiliciti.ed arg:illite and che.rtbreccia, quartt., and fault gouge. Some of the quartz replaced the ations within the qu.adrangle is unknown but is believed to be small. upper country rook, and some was deposited in fractures and open spares. Evidently quartz deposition was sporadic and repeatedly inter­ Other pl.acers of importance include reworked Tertiary gravel deposits at the Onion Gulch, Griffith, Weaver, and Buck Gulch rupted b,11 brccdation. Near the end of the mineralizing process, :.ulfidE:J mi.nen:il.8 and gold were deposited IOCW.ly . The vein allains placers and recent channel grave.la at Umpqua Gulch. The Umpqua Gulch deposits may have been derived from reworked glacial de­ C retaceous maximum widthsof25 to36 ft. locally but averages about5 ft, Diporthe vein varies from-600to 80°SE. bris. to wer In moi;tplaces, the vein cutil only homfel.sedchert and argilli te. Grimodiorite dikes are cut hythe vein at the Mammoth and Belle I I "" <.,) KJbm KJgp 38 of Baker Mines. Ore mineralogy varies. along the vein (Plll'dee and Hewett, 1914, p. 95-98). At the Mammoth and Belle of Baker Chromite deposits ~ I I Low-grade chromite deposits occur at the Ford and Myers (23). Meadows and Duckworth (24), and an unnamed chromite prospect upper ' Mlnet:<, the gold is largely lroe, occurring in narrow zones ofhighlysilicilied a:rgillile breccia. Associated minerals .include pyrite, ar- 0 (9) (We,tgatc, 1921) . The chromile is disseminated in thin lenses and bW1ds W serpe.ntinitc and talc-carbonate rock. Only a smaH N Jurassic .amount of prospect work haa been done on theee prop,3rties. 0 mi:!dle and (}l) lower REFERENCES t,J 205 ;,l 1,.1 pper A..-,oog, II. L., 'laala,,_l,, W. H., and Haloa, P.O., lWI? , Ill,..&...,. K-A,~.. eayar M...,..,,.g,,,n;tr , nocb ..d tho;, S. ""'"'p;""""pmatr..n, Ongoa, w..i.;n,gtt,n, a...i h!•l>o,C..,ID;Ji,-;,•lli1, o:Jt-q'. .• o,_ Slate Un;.,.,,.,;,, ...... thosi,, 372 p. EET :::: PUUO-. J .1'. ..d fl""''tn• D. P'., 191' , G<,,:,loty ,"4 '"'IMral -oflbo Sum-...... ,ln,.na lo. Or.,a,,n, 0...,.o (l,...... afMi,...aruJ.~. Mio,...! --ofO.-.,,.-, •· I, no. G, p. 3-12! 0 IPermian hnloo,J. T., H.-.. D. F., Rnoi!nmm, T. H .• Klu, F, J. ,nd Calk, .... , . •J_ l!Nl. l'>ain>ino.,. r,,.ioc,, Sumr,t,< d!Angl~. o,_, c.._ IMp,Annl,!nufGMl,,i:y alltY q_... ~•- ll,oltcr o.nd Gru, o:...n,i.... ONpr,: E\li

ii'; T,,,J,....,k, W. B .. 1957. G.ok.s,- af tho Elkho.n Youni.UU,oorlha.ot.rn "1t41..,,Bold )lo\lntatr. Wll>ollth: o..olOllol. •· 61, DO. 'l. p, !Bl -233 w...... ,., L. G., 1921, Otpc,ottoof-.ia In MDn> Ortjll)CI: U. S. GeolOfiW S..""l' 11\ill@tlo ru. p. l 7-60.

Table 1. MINES ANO PROSPECTS IN THE MT. IRELANO QUADRANGLE

Map "'1!11eor Goolc,glc no. p~nllfM Elew.Uon (ft) !ormlltlon ~c d!l8CriDIKm suruo. and/or vndercrouni:I worl

l . 6uck Gulcti SW , Estimated mir,irnum 1,000 az Au 1, 2,5, 9, 1, EXPLA NATION (811304, !lfl!W!I) ,. P-. 5'9ml<;onrolldaled Tertiary gravel 89wlral ■crN mined: nearly 1111 01 the gray9I h.a bftn work9d Unk~own; 0~••11i•d prol"l\llbl~ "' ' durln;, 11;1l')Q-1$()$ ' 3. AJl«'I PrQ9P9el Hom"""9cl --i,,,,Minlll> Short Mil 4 Nam& unkoown MOO 9-r wn11' betwwn arglllllll IIOO hotnfel9ed ullntmillic roclQr Short 9Cllt " Alluviu m (Holocene und P leistocene): U neon.so/ idated, poorly sorted fiu.viatik de]JO$its " ' " '·""' S. Malde,.. n,eem " ' ,." .,., Aesidual place, and quartz .,,,;r, In rl .,.Jlt In bBd ro..« - consisting ofgrav,el , sand, and silt in cha nm ls and fiood plains of the presentdroinage sys­ 6 Name unknown " ,' ,. .... f-lon,blo!,nda dlka wllh quartz In di<>rke 30-1'1 open cut """"- " tem " EJ s,_,. ~ in carbonaceous "rglllte Shcrt adit 7. Name unloooooliotlled ll'111181 .,.;th tufltlQi!QUti in!a~ SeYoral -IICftlS mined ' " Glacial deposits (Holocene and P leistocene); Unconsolidated, unsorted accumula• 9. cnromti. P,ospec:1 Cbrornitll len""9 in OOmlelsed ultramanc roclG Small hand-11!1o!ldalhd gtawl 12. Gnfflth P1 aoer "' " SswraJ - .ni...:.:I 12.:v .s.10 13. Nama unilnDwn " ' " ?raOOf. Semlrorrsolldli1ed 1111M11 unoertylr,g besalt Several .acres mined 14. tfu.)"6180,k ~ ­ -SW " Plilcer. Chennar grawl al Bull Aun Creak Abeu! 0.2 ml ol cl"Mk hall l>Nn minacl 2, 14 Gravel, tuff, and tuffaceous sediments (Miocene•Oligocene): Unconsolidated W " ' Wf:lth\l~I On:K,1~7J - " ' " (1/1&Wj weakly conSul 300 It ct WC'1dr,gs a, 1WO :oc:1 111 am.ounts ofclasls representative ofone or more of the TertW.ry volcanic units in a matrix of ,.. " ' " voh;anic ash, sand, arul silt. Localiy. the deJJO$Us have been worked for pincer gold, espe­ 18 Na""' unl ' , •= ,,, Semiocn90lid 11rgil!l11t with Qulrtz lllrlng11"' S/\illlaw pit ' 23 Ford ano M)'ers .,." ", ,' '·"" m, u,w.gradl! ciiromile kins In $t1811rad s&<>nlltD rock Shallaw pit ' Locally, silU:ic tufT and graurd dqx;sifa OCC'ur betwun f].ows. T h~ aruUyzed samples fron~ 2!5. Geld Bug.Grizzly ' ,' '"" m l Cant,,c1 - tlfl)illllt, and :!ll'learecl ul1fMtltl rlc rod(,,; and 300-1! !iNlh And two !ihcfl adlts ' dif[ereJtl /lows range from 48.39 to.SO.W percent SW2, 0.09 fo 0.67 percent K20, r,md2.09 IQ • '""' (618003, "10/1Ml() 26_ B1Q Pine - "'" si.a, ro,w, In 1,g11111e Shelf! ~~I 2.68 percent Na2f) • V , lllafllt1r l!IY!tl"1 rrnm 1tvm acl jts -M inim~m ■stirnate af 9.000 az 1,:3,4,&, 7,8,9, 1 1, 12 ' ... cla zana 25 fl wi de. Mth pyr1le. lKHr!Cpo/nlll, tlllrahednta, mar· ' ' carane. scttwattlte, wrarll'Jl'Me. aoa ctn ri aDar -rol.'kiU..:o~~ ~~8si~ r~: Silicic tuff (Miocl:!ne-Oligoccne): Pink and light-gray porphyritic and 1w1tp(Jrµhyritit:, - Mountain and IDo mi.-­ hornblende-bearing, crystc.l-uitric and vitric tuff of rhyodacitic composition. (TWQ typical 251. Bald Mountain .,. On Iha a.old Mountein-lD9x vein system t.Jo<"9 than J,ocll fl o! workin,ia. on rh,.., levaltl See I~ (28) 1.3.4.~7.9.11.12 samples.averaged 70.91 percent Si02, 1.34 percent K2'), and 2.84 percent Na20.J Porphyri­ 30. Na,n,<, unknl'.lwn ' ' Qurirtz-ar,;rl~ll8ibreool11 ~- Shallow l!'l!l!'IChea Unknown tic varieties contain relict plagioclase and crudely aligned euhedral WJrn.bknde pherw­ 31 . Grand' Trunk •• ' •, On t719 B>tld r.lounbirrlb!IJ< v81n sy,,Mm Morl!I !Mn 2,0CO fl o! workin.i,,. In two ac:lit!I Unknown 1,14 (2/103) crysts in a glassy matrix which contain.s resorbed crystals of feldspar and quartz 32. F.alr,~ " ' auaro !lttillQflrn. and llmanltle brooclo 811d gouge In hom!elood Shon adit and treoohe!t Unknown .... a,glll ltll ~ granodlorlta (pafl. 01 BalO ' Mountain Group) " ' " 33. Gold FH:;, fl edit ",, an aphanitic grouncimass. BWtite and orthopyroxene also occur as phelWl:rysts. A nalyzed 'J7 Bunkar Hill SW ' Wf1$1:em,nc,lt Hpc,tlUre c,f the Norlh Pole-Columbia lodl!I 600.ft Mil 1,3,4,S,7,9.1 I , 15 (Lil~c CIAim) samples range from 6627 to69.83 percent SiOz, I .76' lo2.10 percentKzO, ,;ind 2.98 tv3.11 ' ' 38. Cnu::kM-Klonc vein 9J918ffl 300-11 o!Mlt with dtifle 1.3.4,6,t)UT " " ' . ,C,m Ba.Id Mo\lnt.ain EatbQlitb {Lower Cret.a,::eou!> and Upper Jurassic): Dominantly 41 Belle DI Balter s, On the Bald MOuntaln-lbe~ win •rslllm ~tt s!lutt with 2,000 t: ol drltts E.iltlmel!td' :20.IXIO oz Au 1.3,-11,5,1.9.11 ·­ Se-,,en,.I BCIBO m l,-! • O'ianriel g.m,els Somo tonalite ondgrarwditirile, with small amounts of rwrit2 and quartz monzonite (Tau&e,wck, ~ - l,.lmpqua G.uich Plaoer SE " "'° '"" 43, Ma111moth Pl11Cer $W ,. • "" $V'.'llffl ~ !ldjlq,nt to g la,;;411 llttPQIIITTI Several acres mlll!KI 1957). Dikes andsifls ofsimilar compositiom; occuralon!( the border,; of the batholith_ Rb­ " '"" o• ' 44. Uncia 8..-n ' '7,100·""' 4-lt-wide fault zone with quartz ,iring..-:• and pyrite Short aait Brand K •Arages for the batholithrange froml31 lo 158 m.y. (Armstrongandothers.1977) 45. St\llridltfl .,. "' • ""'"' Ollilrtz vo_:irrlebt with ~1filll. Chalc:opyrl"'. end te1reh8drite ShOfl adlt9 " " ' '·"" "'""' ~ - Cap Mafl/n .,. NorthMst-trendlng (111Mb: .einll wilh WlfidM 300 tt ol wOflclngs In lh- adl!!t 47. MOnumental $W " ' '·"" "'""' Numerous quu.rtz veins with pyrite, eroonop)'nlll, spoolerHe, Owr 4.1)):) tt ot wori ""'-Esllmall!ld 3.000 02 Au end eo.ooo Grays P eak Stock (Lower Cretaceous and Upper Jura!isic}: Sawllite of thR Bald " ' '·""' "'""' gllktna. anti 1111rahl!ldrltu ~,., Mountain Batholith consisting chiefly of norite and tonalil.e (Taubeneck, 1957, p. 191) 48. Ophir Nerrow q uertz .,.,In with rn>SSMI pyrite 1.400--it c'°""cut adit ~ - S,.,mmit " ' Faull zone ,,..111, quart>: end ,,_;,,a sullideo;,, hornfa1-iargt1. Two short lllclil!5 B' " ' ,,,. "' 50, Ul!ld Lodi> ,... O....rtz veins with pyrite, -,opyrtte, spl>alerite, chaloopyrite, Three shcn adhs; sboul 200 It total Mixed rock tcrrane: A s!ructuraliy ,·haotir.: ar;semblage ofrocks ofdifferent compositions " " ' " a,_, tetrai--rite and ages consisting of te..:tonically juxtaposed blocks nnd ~-lice.s of alten,d, serJ)l!nlinite, 5 1. Name unknawn Co- v&inle1" In llmor,tllc fault b si,ricile, pyrilfl._ a<-,c.tpyrill!I. Four !!hon Mlts: about :ioo n ,.. 6,10,12 unit cr;n.sist.<; predominantly of green.stone, gabbro, and .serpelUinized ultramafic rocks. (Mcon And'te-t Gr.al4)) • "' .ano !IPll&Jeritl!I 54. Crown Point 7.100 4-lt-wldu fuurt ZOllll withqll, and llfliCOOpyrho 1.BOO It ot worklrl{!!I Sm11II 1.9.11 Loe.ally, serpentinitr. is rf:f:rystalli.zed to talc,chlorile a11.d talc. -carb01iale rock. Blocks ronge (Moon Mcilor Group) • " from a few 1M!ters t,_, Seuerul hundred meters in k,,,geM ditncn.sfon. T,!CU!ni.sin refiponsible 55. Name un!mown - ,... T...o 8rl0/1 adlle (Mc<,nlairl S!Ojl,l?j • fordei,·elopmento(the terrane probably occurred in Early to Middle Triasi,ic time. ThiscCnfl will', quillU. p:yrilC. ,.,_,.,pyrite. chelco­ Mona than 100 II c,f wori'1't witt> qu1ut:. pyri\ll, 11.rwnopyrite. !1ilfen:il. 0Wr 1.400 tt QI VIQli\ifllll! 1,5,11.1 2 • sphalerita. an::I chalcopyrite ored argillik, sil.icrori.s (Irgillit.:, and clu:rt, with i; mall amou.ntfl of fine-grained felsic tuff, 61. Hor<:ule3n " On !he EagJe vein(?), ll!-ft-wide l>roockr. w@Willlquwtt~rlng­ OWr QOO n ol workfngs In two adtts saru:ll!fone, and con.glor!W!rate. Some argillitcs are rieady black due to high carbon cOJ1te11t. ' '·""' ..,,. and lenses of pyMte. Bl3ellll" zane -,,,ii!, pyrite and CNff 1,800 n 01 womrtgs vary from grayish green lo pale yellow. Argillite and siliceous argillite are the most abun­ • '·""' .,__.. dant rock types; chert predominates locally. Many exposures con.si.st ofalternating silfoeous 64. Alpine Group " Sho:)Q;, :rorKI wllh quonz ancl lrcn oxld&fl Al;,o\,1 eoo II or wo,kinge Small 14 (10'12/01, a.,id argillaceous layers ranging from a fraction ofan inch tc several feet thick. The siliceou~· (Mclrmon Boy) " ' 1°"15/04} (16_ Eagle V"°fl " ' Faull ZO!'Ml 2Q fl wida ..t,ich oontai"" W inge"" ~nd 18,_ o f 1,3,4.l:i.6,7.9,11 layers commonly pinch and su:ell between layerso/'argil/Ue. 1'he tu{fsgeneral/yareaphani• (lmp,,l"i!tJ·E.!lglot) " googe, qtlflrtz, ,;it! Glte. ""~ !ll!l11oee- in,;:IU(ling pyrfle, a,_,._,. tic, flinty-textured rocks. T iny quarl2 and feldspar phenocrysts are barely discernable .in ' pyrite. !Jllltillljl, IIP™'.,-iw, ;md chelCOl)'frile some hand spec.imen.!l. Rare pebble conglomerate beds consist ofpoorly sorted, subrounded 86. !mperl~I Vein Fault zone 4 f1 wide with velm and fmeM!s ol fault 110uge, qullr"IZ. About 4,500 f! 01 wo,tlng~ on three le~ Small 1.8,4.5.6.7.9,11 (!mperiaj•Eagle) " '·"" '"'" calcita. and sulfides lncJudl"II pyrflil, arsenopyrite. galena. fragme11ts of fetsicond mafic volcanic rocks, cher!, andargillite uptoJ in. in diameter in.a ' Oph,alerite , and chalcopyrth! matrix of similar composition. TM rocks underwent complex deformation and regional BT. l.881 Chane:$ ,. Otl lh9 Ult ~rtf Mae " " , ... "'""' May MM !OOMSlon ol 100 C31ifomla win. Oro mlrl!lfills lnctL>do Sh"'1 adit al'ld sl\altcw !WI!! • pyr;1e. ll!"S8nop~rltl!I, ga~na. and chalcopyrlle erly and dip steeplyW the fJouth. lntricat11 small-scafo brecciatian is common. R ocks in the " "'"" ' 71. Galifom"' - ,. :)-ff-wide t e olt zone with QouQDu1 2,200 fl of wml: -~ ~ iMa!IMI 2,000 ,oz Au 1,3,1~11,14 thermal aureole o/' the Bald Mountain Baiholith and Grays Peak Stock have been "'""' horrifclscd. Within a. few hundred meters of the <:ontoct, argillite has been recrystallized to n. "4ol.lntall1 View " " ~... ioo fault wne with goclw. 1:1.14 [OVees argillite oontool< (north<>il$\em O,evon, - h!l!f): Qcvgon C)Qp.,'1mQ""""""r the Sumpter ciuaclrangla. O,o,gon: 0""11Qn 1l ur<1au or Mines and GecsO\)y, G011logy 11nc:1 Ml,..,nil 1n-du:w;,,,. Bul! elin 14-ll. 157 I) Mln,,..,1 l't8IIOU""'6 of Qcegon, v. 1 , ""• S. p. 3--1211, 11 Brooks, H. C., and Ramp, L, 1968, Gold end si"8< In Oregon: °"'11on Oeparl- ol ~ and Mlno,,al 1noust,;.,. Bulletin €11 . 337 p. GEOLOGIC SYMBOLS a . Swartloy, A. M.. 1014. Or11depol5ifflof notth8111<1ern0r,og,on: Oregon 6urNJ.1 o! Mina and Gaol<>gy. Mjflllfill Re:iouroes c,tOregon, v. 1, no. 8. 229 p. 1a, of Geology and Mlner1l lnclu!i1rln, Mi-lila Unpublishlld raport:i 1hfl Deoaflmertl: 5 Perks., H. M. , and Swartie,,,, A. M., 1919, H8ndbook o11he m ini"II lng~. MI011ral AMO<,~ o1 On,oon Department rllp(.>rts: flllld Ill Blllwr lll:l<:&tian ol mining claim>. Strike and dip of bed -+- Strike of vertica l bed Strike and dip of foliation -+- Strike of vertica l foliation Geologic Cross Sections Quartz veins and mineralized fault zones - dashed where approximately located A

■ 76 Mine and prospect locations - numbers correspond to map nurnberi;. in Table 1 7000'- ! sooo•- rT=9·,===c!Tgb==,"""'---, --JJL==--=~T~b1:=:=~ Tb Tgt 1 I' a: J l\Per 5000-,I 'ft Per , , ! I m, 1,'l I mt \ \~ liPer I KJgp /' I 4000'-L------'-----...L.--...L------I \ ; __J______. I______...,_ "'' 44°45' 44 ° 45' 1'18"22'30" R35½f: R36E B B' :? 373 ! II NE; 118° 15' Bose Ma p by U. S. Geological Survey SCALE 1:24 000 Control by USGS and NOS/NOAA * 0 I MI LE Geology by M. L, Ferns, H. C. Brooks, andJ. Ducette eooo' ,ooo ,,,.. Topography by photogrammetric methods from aerial 1000 0 3000 oOOO 7000 FEET C pllotograohs la ken 1971- Field c-hecked 1972 "'"' Field work completed.1981 uJ 0 KILO MCTRE Projection and 10,000-foot grid ti cks: Oregon coordinate 100d liP.er 0 •5:;,, 'ftPer system. north zone (Lambert conformal conic) 16 MILS CONTOUR INT ERVAL 40 FEET Om Om 1000-melre Un iversa l Tra nsverse Mercator grid ticks , NAT IONAL ~E00£flC \IE.R TICAL DATUM 01" 1929 'I 1 rn-n e 11,s~.own 1927 North American datum ? FundOO irr part by United Slates Department ofAgriculture- U. S. Forest SelVice 6000' I I I Map~by "!\ Per \ I 'V LJ\, UTM G.RID AND 1972 MAG N ET IC NOIHH [3 KJbm , 1 OEP.Un><£Nr ~~Jo'7_,£f _.&mi:t~ O~nt!UO OEC LIN~T ION .<, T CE NT ER or SHEET QUADRANGLE LOCATION ' . KJbm\J , Cartography by Pau l E. Staub, 1982 sood-L------'------'---'-'-'-=-_,,_-----'------'-'~