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Collier Creek Copper Reports STAlL Collier Creek Coppe Company(~ /1/;,..) ~rry County :::) ., /I., /:•.,-~AA<. I The work on this ro~rty was done about 1900 and nothing has been done possible yearly assessment work. ,, ;/. Mr. Frank Berry has l{een de~ about 20 years. According to / Walter Fry o:r Agness no one c~ms the property at present. Informant: J.E. Morrison 702 Woodlark Building Portland, Oregon Heport ot rooom1aiaaance at. several coppe1•-nickel-oob&.l t pros­ peota in the vicinity oft.be Hurt cabin, Collier creek ~rea, ~urry Oau..nty by .ti. ~. Dole, ....,. i-1'.euap and li. D. Wolte--Jru.guat G2-23, l9ol. l.NTk<JDUC'J:lu.N The purpoae ot thie reooana1aaanoe was ~rincipblly to in­ vestigate the ooourrenoe ot cobalt in the Collier Creek area reported by Butler end w.,ohell (lil6: i6-l00). A total or aeven ~aya were required tor tlla investigation with only wo d.a1a s1Hm't in aotual t1el'1 work, the remaining five ~~J• being required 1io &•' to an4 trom t.be areb of 1nvesti­ gfi,t16n. ,Proapeota v1aite4 1nclu4ed: tba Copper C1tJ Group near tai1 liurt oab1n looated in sec. 2, T. 37 s., h. 12 w. ; Gray Copper No. 8 and. the J\dama Prospeot in sec. l. 1l'. 37 L., l{. 12 w., an<i. Gray Copper No. 10 1n no. 36, 1·. 30 s., R. 12 w. Gray Copper No. 8 and No. lO am the .Ad.am.a Prospect e.re located near the trail extending trom t.t. Hurt cabin to tbe No.rih Fork ot Collier creek. lt waa not possible to determine detinitely it 6J1Y ot the properties viaitea correspond to tifJ.J of tbose listed 01 Butler and Mitchell (l9l6:i6-l00). Deso.r1pt1on ot tl'B Bonanza .King copper Group by Bu tJ.er lilld. Mi toh.el.l. ( 1916: 99) correspond• oloaely to the present Copper City Group but tbe map looation given is consider­ ably 1n variance. It ia believed, however. tbbt theae represent ea3entiell7 the --.e property. :£he Reid Group mentioned by Butler f.tllQ. Mitcbell (l.916:100) may correspond to any or all ot tl:le other three proepeota viaited--Gray Copper No. 8 a.nu ~o. 10 a.Di the Aciams Proapeot. The area 1a re~clle~ oy some 20-26 miles of dirt ~nd gravelled road (via either liuntera Cree~ ra&d or the ~iatol River road which ~ e.xteno. etiat trom. ta, oOEiat h4hw•y aouth ot Gold Beach) aD1 then by ten miles ot trail extell4ing tram 'the t>now Camp Mt. road to the liurt oab1n via l:i.U.ntley Springa a.DJ. sourd.0\1.g.b. C•P• a 1',,W'E.hAJ., GEOLQGY 'l'bere was insuttioient. time on this investigation to make other than very general obaervationa r•g~rding the geology ot the Collier Cree~ &rea. 'l'he area immeda tely wrr0\lnd1n& the Hurt oab1n is le.rgelJ per1tiot1ie I.ind serpentine. Thia is part of a le1rge 11.iLi&& ot u.l.trabaaies whl.oh extenda to the north to tUld be­ yond tbs lior th .lfo.rK ot Collier Creek. " ~hn,-,l-w,~,,,i "[ /"::2_. f I AA /) ,-7 GENERAL GEOLOGY ( continued) Sandatone, sbale and chert were notea in the area a short dis tanoe west of tha Hurt cabin and extencU.ng west to the vicin- 1 ty of Saddle Mt. Butler and Mitohell (1916) mepped this as pari ot the Dothan tor•tion. In the area along the main branch ot Collier Creek east ot the Hurt cabin they have mapped a body of gneiss, termed tbl Craggy Gneiss. They proposed tba t 1 t is a metam.orphoaed phase ot 'tibe adjacent Dothan tori.Iii tion. All prospects examined occur within the ultrabasios in serpentine shear zones. The depoai ta examined consist of pods or lenses, largely composed ot magnetite with aaaooiated copper min­ erals. Cobalt occurring as erythrite is preaent in some deposits but in relatively minor amounts. Butler and Mitchell (1916:64-59) in describing this type of depoai t ill.l.d the rel.a ted sbear-z.ones in Curry county report as follows: " 'Boulder' or tloat depoaita. These constitute the most interesting and, probaoiy the most important deposits ot copper in Curry county• and. are so unusual in uny or their :features as to deserve somewhat extended description. The tirat peculiarity to oe note4 ie that the deposits are confined to serpentine• or to peridotitea or al.lied ultre­ baaic roc.1:es which hsve been almost completely altered to ser­ pentine. While oopper deposits in auoh materials are not un­ known they are so rare as to make thia association in itself a :feature or rather unusual 1nteresi. The second point worthy of consideration is the unusual mode or occurrence of the ore. as it is tounu in more or less ~ boulder-like or lenticular Dlii saes which a.re usually uneystem- · atioally distributed. throughout the serpentine. These in­ dividual masses vary from a few ounces to several tons in weight. and commonly appear to be aosolutely unconnected by atringera or anything else. The ore (described ater) resists weatherin& to a notable degree, although exposed poriions are sometimes partially converted to limonite, and often outcrops prominently so as to have the appearance ot rounded fragments whioh have broken ott from some higher deposit of great size, and have rolled down to their prea.ent position. In feet, praotioally all the prospectors with whom there was opportunity to talk were of tbe opinion that these masaea a.re merely float, and th.at, when the mother lode 1a discovered, it will be :found GENERAL QIOLOGY ( continued} · to be a very large and rich vein of aome kind. A 11 ttle in­ ves~iga tion in the tield sutticed • however, io prove conclusive­ ly that eachmasa of ore is in place in the serpentine. Although this rook ·is some times more or lass sheared and aottened around tbe ore bod1ea, the ore minerals are usually eonf'1ne4 to the nod­ ular ••••• ot ore t.bemael vea. In some plaoea theae 11 itle bod­ ie.a of ore are comparatively oloae togetmr, while in others they are widely separated, am ottea tll&re seems little or no ayatem in their di'atribution or J!i&g:ni tude. - The ih1rd unusual feature shown by these deposits relates to the nature of the minerals tound in them. These consist· mainly of m~gnetite {magnetic oxide of iron), which is otten rather coarsely crystalline. Cavities frequently show the tn,­ ical oota~edx'&l crystallization of thia mineral, but, in at l~at one locality, the crystals are cubical. Associated with magnetite, are oopper minerals ot varioua kinds ot whioh one of the oommoneet is ohaloooite {sulphide ot copper). This min­ eral has an unusuttlly high luster, is notably seotile, and ci.if­ ters from the ordinary type.or ohaloocite in that the pr1SJD8tio cleavage is uncommonly distinct. Other minerals usuallJ present in greater or less abundance are ouprite (red oxide ot oopper), bornite (a sulphide of oopper and. iron, wb,ich bas a browniah color when untarnished) , and nu tive copper which ia sometimes present in nodular masses weighing seTeral poum.s. Lesa frequently are found nwlachite (green carbonate of copper), azuri te ( blue carbonate ot copper), / ohryaoool.la (blue ailioate of copper), tenorite? (blaek oxide of copper), arui erythrite (pinkish hydroua arsenate of oobalt). Ocoaaion&J.ly thin erusta or f,il.ms ot a bright green chromium minexel of uncertain nature are alao present. 1n one or two localities, notably in the McKinley group east ot Gold Beach, chaloopyrlte (sulphide of iron and copper) and pyrrhotite {mono-sulphide ot iron) oonstitute the bulk of the sulphide minerals. Not in.frequently chromite replaces the mag.n..e ti te to varying extent • Practioally no quartz or calcite, and little or no pyrite or otl:uar minerela common in ordinary vein deposits are present. In tact, the only gengue in the ore bodiee is magnetite, chrom­ ite, or one or more ot the otber minerals al.ready mentioned. Mr. Frank Berry, ot Agness, who baa done considerable work on thia material, expressed the oonv1ot1on that the oopper ores are e.lwaya overlain w1 th ~h• m.agneti te or chromite. It is bard to expl.a.111 auoh an oocurrenoe, although it ia true that the re- ,. GENERAL GEOLOGY (oontinued) lationshipa seen in the field seem to substantiate this theory. It may be that the magnetite or chromite originally formed a oore around Whio h the sulphide m.1n.erals were deposited, and tilbt the relative ease with which these may be disintegrated and leached. away when expoaed. on tbs eur1'110e of the ground aocounts for the feet tbat the co.re ot •&netite or chromite is the materiel usually exposed. Unfortunately• ~t or the ore bodies examined bad been ao cut up or ao a. rgely removed by mining operations as to make it impossible to prove or disprove thia hypothesis w1 th.out the expencli ture of more time and labor ~han could be giYen to the :problem. • • • "Bhear-zonea in ae~entine. In moat of the serpentine areaa which. contain the oulder-11.ke masses or oi·e already described, there also occur zones or copper-impregnated serpen­ tine. locally called veins. In these the ore minerals ere con­ fined to the joints·and slips eYerywb.ere plentiful in the ser­ pentine, but which appear to be especially numerous at the point• where the copper mineralization is most pronounced.
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