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Ik MARGINAL NOTES GEOLOGICAL AND MINING SYMBOLS ZARN LAKE AREA (NORTHERN PART R 2232 LOCATION AMD ACCESS: The Zarn Lakn area is 5000630 Ministry of Hon. James A C. Auld bo und H d by Latitudes BO ©00© and 50" l l ©(M and by Glacial striae. 6 50 0 06©30" Minister Longitudes 91 33 and 91©"©45©W, including por Natural tions ot NTS sheet 52J/4E. The easternmost por Dr J. K. Reynolds Deputy Minister tions of Block 10 and Drayton Township, and a Small bedrock outcrop. Resources portion of Benedickson Township, are also included Ontario within the area. Thunder Bay lies about 240 km to Area of bedrock outcrop. the southeast while the closest population centre, Sioux Lookout, is about 15 km to the west of the Bedding, top unknown map boundary. Some locations within the map- (inclined, vertical). area require float plane service or canoe portaging, ONTARIO GEOLOGICAL SURVEY minor M-fo!ds but general access can be gainsd from Sioux PRELIMINARY MAP P.2233 Lookout via paved road (Highway 64?), boat, Bedding, top (arrow) Walion or Canadian National rail service. . . from grain gradation GEOLOGICAL SERIES (inclined, vertical, over Look, HISTORY OF EXPLORATION: Exploration for turned), Lake mineral resources was slow in coming to the Zarn ZARN LAKE AREA Lake area, primarily because of easier access To Bedding, top (arrow) adjoining m^tavolcanic: terrain lo the east and west from cross bedding (in (SOUTHERN PART) in the Rail y 1 900©s (Sturgeon and Minnitak. Lakes) clined, vertical, over Discovery of gold-bearing quart? veins in 1929 turned). DISTRICT OF KENORA stimulated the first extensive prospecting and staking activity in the map-area. Numerous yold Scale: 1:15840 occurrences were evaluated d LI t mg the pen od s Lava flow; top (arrow) 1930-1936 and1947 1952, and again around 1963. from pillows shape and Mile Mile No production has been obtained, but sporadic packing. exploration (primarily for gold) has continued up We Ires 100 d l Kilometre to December 1978 Schistosity (horizontal, Base-metal exploiation is a rdalivt.©ly new dcvcl inclined, vertical). opmenl, commencing in the area in the early " NTS Reference: 52J/4E 1960©s. Based on information compiled from the Gneissosity (horizontal, ODM-GSC Aeromagnetic Map; 1 1 38G Assessment Files Research Office, Ontario Geolo inclined, vertical). ODM Geological Compilation Map: 2169 gical Survey, Toronto, it seems reasonably appar ent that no in-depth : phased program of explora Foliation (horizontal, tion has been conducted over the area for base- inclined, vertical). OMNR-OGS 1979 metal (massive) sulphide deposes. iVtmeial duposils known within Ihi? Zjin Lake Lineation with plunge. Parts of this publication may be quoted if credit is given and the material area to December 1978 include yold associated is properly referenced, With quarU-sulphide and quartz-carbonate-sulphide veins, silvei associated with quartz veins in sheared Geological boundary, quartz-sericitc carbonate locks, and iron containrd observed. within sulphide bear ing ironstone s. Coppei, lead, r /Y 00 and ?mu sulphides are commonly associated wirh Geological boundary, J gt,citd tli!© precious metal occurrence;-, n the area, which position interpreted. t f in turn are contained within a vat cry of mafic lo felsic host rocks, but no distinctly stratabound MI! / Fault (assumed), IM^^©ktJf©^^ ph id f1 occurrences air; known In^©S^J&fr. %©^W: GENERAL GEOLOGY: Bedrock within the Zarn Lineament, Li.ki- rirrui k apparently al of Early Precambrian age. Roughly two-rhiids of the area is underla.n by Jointing (horizontal, rnahr to felsic metavolcamcs, several hypabyssal inclined, vertical). intrusive bodies, and minor metasediment^ uivts. This primarily mu t a volcanic lorrain is bordered un the southeast by a salient of the Lake of Bays Anticline, syncline, batholith, ..tid in the north, is in fault contact with intrusive and gneissic: rock©; of the Fnghsh River D© ill hole (vertical, Subprovince, Felsic metavolcanics occurring to the south of Hie west end of Botsford Lake consist mostly of coai se fragmental rocks and massive to flow- banded lavas. Bedded pyroclastic rocks are very raie, j feature believed by the author to he a pi i LOCATION MAP Scale: 1: 1 584 000 or 1 Inch to 25 miles mary character stic, as exposure is adfquatf1 and Shaft; depth in feet. deformation is minor tor much of the unit. Bed ding charartei istics (01 lack thereof), combined Magnetic jttiaction. ,vith fragment morphologies and gi.rdalions into tlow rorks, suggest that most ut these felsic meta- vokanii:s arc the products c ! pallial lu complete rtisrntegiulion of Mows diid-©u© donn-©s. The felsic LEGEND^© rocks, along with ihr nvi lyinq mafic and inter LIST OF PROPERTIES, MINERAL DEPOSITS, mediate rnetdvnlcaincs i x posed in the Kirk-Star- AND AREAS OF EXPLORATION PHANL-ROZOIC Michaud Lakes inea, may be inferred to have then CENOZOIC b origin within ,i majoi volcanic centre -;ome 10-15 km southwest of Alcona (Pag* 1 and Clifford 1. Alkenoie Buffalo QUATERNARY 1977). 2. AuraleeGold Mines Limited 11947 j Hbt;ENT 3. ConsolidjtPd Bellekeno Occurrence IntfM mediate and felsic mi©tavolcanics else Lake;, stream, and boq deposits 4. Conwesr Exploration Company Limited 11971 where in the map-area art1 notably more deformed 5. Gulf Minerals Canada Limited :.han illite of the Kirk Lake an;a, generally occur PLEISTOCENE G. Ken Addison Prospect ring ,iv aphyric to quarv-©eye© quar t/-se" icite Sand, gi avel, and ground moi aine deposits schists (jarnhi and muscovite an 1 developed in 7. Moietti, R. (Florerjold Prospect) feli; i r r 1 * nusives at the margin of the Lake of Boys 8. Pure, W. H., Jr. UNCONFORMITY batholith m the southeastern corner of the map 9. Rnyan, F. V, Michaud f area, whereas ca r bomite is a mi©K)^ 1.0 abundant 10. Richard:, Occurrence 60 . A PRECAMBRIAN constituent in both iniemiediaie and felsic meta 11. itosenblai. R. S. (Alcona Mint©s Prospect) EARLY PRECAMBRIAN (ARCHEAN) volcanics m Ihe Rosnr;! .id-ng Black Lake area. 12. Rosenbiat, R. S. (Alkflnor^-Buttaln Prospect) 6TH BASE LINE FELSIC TO INTERMFDIATF INTRUSIVF ROCKS cl Mafic me l a volcan i o l h rough out 11; e area are 13- Selro Exploration Company Limited 11971 quite unifomi, with only local occurrences of 14. Split Lake Mines Prospect G Unsubclivided Ga Homoijeneous hiotito trondhjumita, hornbluruio-biotite fragmental units. Mafit -ocks have generally at- 1 5 Thompson, W. M. (Rosnel Prospect) Tron(Jh|emite larned greenschist facies met a mo r p h.c grade, 16. Tweten, D. and Tweten, J. (Young and Spencer Pros but also occui as amp n: © in lit(©s. or hornfels, in 61: Inhomogeneous biotite-hornblende trondhjemite, quart/ pect) diorite, mafic xenolith-bearing hornblende-biotite close proximity to the Laki 1 of B,iys batholith and the trondhjemite stock ni Spi". Lake. Pyrope- InfOMTiation current to 31 December 1978 Former pro t©©ondh|enrte Bc Chlonti 1 tron(iti)emite e uiltnandme garnets are prominent m mar,c mcta- perties on ground now open tn staking ;i© D shown only 6d Quart/ porphyry, quart?-feldspar porphyry, felsite, volcanics only in a small drea about 0.8 to 1.2 km where exploration information is available A date m brack to the/ north of the Split Lake Mines prospect. quart/ sericite schists ets indicates the k-tsi VMI uf major rvploi.it on activity. 6e Foliated to gneissic trondhjemite, qranodior ite Vein-quart?- and quar ^-porphyry bearing con 6f Porphyroblastic to porphyritic rjranodioi ite, qua-©t? glomerates, along with we H bedded, quartz-poor monzonite pebbly sandstones and minoi slate occur in the 6g Cataclastic granodiorite, (tuart/ monzonite southwest corner of the map-arc;! These meta- METAL AND MINERAL REFERENCES Gh Fine-grained to aphanitic leucocratic granodiorite, quartz surl i merits are the eastern extension of the Mhm moivonite, aplite taki Group, first described by Pettijohn (1936) 6| Peymatitin quartz monzonite, granite and defined by Walkrt and Pettijohn (19/1) The 6k Ifoi n blende-bint ite trondhjemite g inferred source rock f DI the quart/ porphyry n©u-, . . . . . , . . Muscovite dt:ti ©t us, an oval plug out lined by Horwood (1937), Pb . . . . , . . . . . Load INTRUSIVE CONTACT has been shown, howevei, to consist only ot rio ...... Pyrrhotite several isolated masses of noiphy i ne trondhjemite ,,©J, py . . ,...... Pyi it©"1 MAFIC INTRUSIVE ROCKSd sui rounded hv the sEidiments. Age relations be idike. tween t h L- two rock types wen; not defined in q . . . . , . . . . Quart? f|c. Quart/ carbonate vein observed outcrops. 5a Biottte-hornblende diorite fjv. . . , . . . . Quartz vein Sulphide-bear mg magnetite-grunei ite-quart/ bh Hornblende diorite, porphyritic diorite sp, ...... - Sphalerite iionstone, wacke, and slatr are found within mafic Cu . . . , ...... Copper 5c Foliated epidote-biotite-hornblende diorite, quarU metavolcanics at vai sous locations along ©he length Ffi . . , ...... Iron Zn ...... Zinc diorrt-:: of Botsford Lake, These units may repn-senl the gt...... Gar rid 5d EIJLI y[tii©©ulcn to ophitic gabbro© eastern extension of Abi am Group metasediments i.D.i©Hdevil Formation?) as defined by Turner and INTRUSIVE CONTACT Walker (1973). Qua© t7-bear ing metasediments oc- cui at several other locations within the meta- on the ground by Asarco Exploration Company MEITASFDIMENTSd volcanic succession and are apparently of volcanic Limited (1970-71) and New Insco Mines Limited 4 UnsLihclividod d(-:r ivation. (1975). Diamond drilling conducted on the :vhuar 4a Quartzose wacke zone during these two options totalled about 578 4b Slate, graphitic slate STRUCTURAL GEOLOGY: Sovi-al major struc m in seven holes but failed to outline continuous 4c Quart/ porphyry and vein quar!/ boulder and cobble tures defined within the map area may have a economic mineralization. An additional 348 ni of conylomei ale bearing on mineral exploration; these include the diamond drilling in nine other hole; has been 4d Quait? porphyry and vein quartz pebble conglomerate, synclinels) in the Kirk Lake area, a dome produced similaily unsuccessful, but there is some evidence and pebbly sandstone by intrusive rocks of Split Lake, and the reg.onal that the majority of this other drilling, alone; with 4e Sulphidic magnetite-quartz-grunerite ironstone fault (7one) along Botsford Lake. Precious metals geophysical surveys run in 1970-71, may have 4f Volcanic and quart? porphyry boulder conglomerate {Au, Ag) appear to be concentrated in quart/- been misdirected by anomalies associated with 4g Pebbly volcanic wacke, lithic arkose wacke sulphide or quartz-car bonate-sulphide veins wtthin magnetic ironstones (and the CNR mam line) the map-area. This veining seems to be controlled paralleling the south shore of Botsford Lake C MhTAVOL CANICSri by dilatant /oivs, or shear /ones, associated with (just north o t Ihe no 1 5 showing} Eastern late faults (BoMord Lake and Forty Mile Lake 3 Unsubdividfid h faults). Substantial shear zones could be present in Exploration apparently directed at base-metal 3a Missive ni flow-banded©1 the mostly covered ground between Out and Black (massive) sulphide potential has been conducted in 3h Massive oi flow-banded, porphyritic" Ldkes, associated w-th splaysoff rhe main Botstord the map-area by Conwest Exploration Company 3c breccia, tuff-brccc©is, agglomerate Lake 7one. Two, major, inferred diSatant ^ones art: Limited (no. 4) and Selco Exploration Company 3d Lapilli tuff, lapilli-ciystaf tuff apparently present in areas where overburden has Limited (no, 13). These two companies participated 3e Crystal-lithic tuff, lithic Luff had limited prospecting activity, namely, the a-ea in a 1971 joint venture, conducting airborne geo 3f Quartz-sericitt; sch-st©1 physical surveys over felsic metavolcanics noith due south df Fo:ty Mile Creek (between Split and Im -V^- . 3g Quart/^eye© quarU©-ssncite schist" Emra Ldkr,], and the are^ no-theasT of Black Lake. of Alcona and Kirk Lake, but their surveys only ---. i, ^ r. w ^ covered ground west of the Drayton Township Documentation of a volcanic succession in the BLOCK INTERMEDIATE METAVOLCANICSd boundary line, extending west out of the map- KM k Lake: syncline provides a starting point for area. No favourable anomalies were disclosed by 2 Unsubdivided stiatigraphic reconstruction of the area. In general, these surveys. Selco Exploration Company Limited 2a iVdssive and brecciated a unit of mafic metavolcamcs. containing gabbroic also tested conductive zones (probably located by 2b Pillowed sills may be traced around the Split Lake dome. airborne surveys), drilling five short holes in the 2c Bieccia, luff btcccia, agglomerate Lack of continuity of major felsic metavolcamc southwest corner of the map-area, and running 2d Lapillistone, lapilli tuff, lapilli crystal tuff units, also exposed within the domal structure and ground geophysical surveys over several claims 2e Crystal-lithic tuff, lithic tuff apparently younger to time-equivalent with the north of Split Lake. No significant mineralization 2f Schistose, lineated intei©mediste metavolcanics mafic unit, suggest that thr *elsu: units are not or suggestive anomalous zones wei e encountered 2fj Hornfels, biotite-quartz-plagioclase schists rnck-stratigraph©C although they may have been and there is no report of additional exploration. deposited at about the same time (i.e. felsic units MAFIC METAVOLCANICSd o1 Lorty Mite Lake, Enira Lake, and m the Black Lake area probably oryinated f tom a vent or vents l Unsubdivided orlwr than those which produced the A©Cona area la Massive, aphanitic to holocrystalline felsic pilel. Extension of these relationships into REFERENCES 1 b Plagioclase phenocryst (megacryst) massive the Black Lake area can on ! y be made on a tenta 1 c Mafic phenocryst to ophitic, massive tive basis due (o cumplex©ties imposed by altera Bergmann, H. J, Id Pillowed., with .nternal concentric structures and ©or tion, intrusive1 bodies, and limited exposure. Con 1951; On the property of E, S. Richards, 10^1 ntrapillow hyaloclastite tacts wiihin this area suggest, however, that the Sioux Lookout Area; unpublished re le Pillowed, unsubd©vided stratigraphy is more leadily traceable along A port, 11p., from Assessment Files Re l f Breccia, luff-breccia, agglomerate, intraflow hyaloclastit nor t h-south, r .jther than east-west, major direction, search Office, Ontario Geological Sur (pillow breccia) vey, Toronto. lg Bedded tephra, lapilli tuff ECONOMIC GEOLOGY: With the exception of l h Lithic tuff, crystal-lithic tuff Holbrooke, G. L one low-fiode iron deposit, all current properties 1963: The Shanon Lake Property of Bank 1j Schistose, lineated mafic metavolcanics and mmeral deposits in the Zarn Lake area arc 1 k Mafic hornfels, epidote-amphibolite, amphibolite field Consolidated Mines Ltd.; unpub East Boy concerned with urecious metals. Silver is notable lished company report. Assessment of 1m Variolitic in only one of these and gold is the metal of in Files Research Office, Ontario Geoloyi terest in all others. Past exploration has br^n CarbonaTi/ed rock cal Survey, Toronto, 7p. pnmarily directed at gold mmuialization, but in recent years there has been some activity regarding Horwood, H. C. Silicified rock base-metal potential. 1937: Geology of the Superior Junction - Sturgeon Lake Area; Ontario Depart Kerr Addison Mines Limited conducted a major ment of Mines Annual Report 41, NOTES: drilling program during 1968-69 on a low-grade pt.6, p. 1-25- a} The lithologic cudes given constitute basically a field legend and may be iron deposit (no. 6). Iron contents ranging between changed as a result of subsequent laboratory investigations. about 15 to 30^/0 Total F e were found to he suf Hutchison, R. H. ficient for conrenfat nq. but apparently tonnage 1941a: Report on bulk sampling of Ghust b) Unconsolidated deposits. Cenozoic deposits are not differentiated on was not enough to warrant further development River Syndicate Group, McDuuyall©s the map. Mills, Ont.; unpublished company at that time. Gulf Minerals Canada Limited holds c) Bedrock geology, Where in places a unit is too narrow to be shown with port (probably Comagas Mines Limited); 10 claims (as of 31 December 1978; no. 5) cover separate contacts and must be represented as a Kne, s short black bar obtained from files of Resident Geolo ing a portion of the Ken Addison Prospect, as appears in the appropriate place. part of a larger claim block extending west out of gist, Ontario Geological Survey, Sioux the map-area; no work has been reported on the Lookout (4 pages). di Rocks in these groups are subdivided tithologicaily and the order does not nectissa 1 ily imply age relationship within or among groups. current property. 1941b:Final report (on the Ghost River Syn Gold exploration was begun ©n earnest with the dicate Property), unpublished company e) Partially car bon nt i zed in the southern Clamshell Lake area. discovery of a vein system at the Alcona Mines report (probably Coniagas Mines Limi f) May be extrusive in part. Map unit Gd probably includes some felsic Prospect (R. S. Rosenblat property, no. 11). Other ted); 2p,; obtained from files of Resi metavolcanics (3f, 3g} in the immediate vicinity of the Rosnel sidind. work in the early 1930©s located gold mineraliza dent Geologist, Ontario Geological g) Th;; origin of these rocks is unknown. tion at the Alkenorc-Buffalu Occurrence (no, 1] Survey, Sioux Lookout. h) May be intrusive in pan, and Prospect (R. S. Rosenbiat property, no. 12), McCombe, R, and at the Split Lake Mines Prospect (no. 14). 1950© Report on the property of Floreyuld The loner "D" preceding a code refers to data compiled from diamond Underground development was conducted on nos. Red Lake Mines Limited, McDouyall©s drill logs filed for assessment work credits. 1 l and 14 and considerable diamond drill ng was Mills, Ontario; unpublished report in used to explore nos. 11, 12, and 14; deposit no. 1 eluded with the October 19GO Pros was trenched. All of these showings yielded pectus of Florcgold Red Lake Mines sporadic high gold values, but lack of lateral con Limited; Sp.; obtained from library tinuity, narrow vein widths, or lack of consistent files. Northern Miner Press, Toronto. grade prevented their coming into production. SOURCES OF INFORMATION 1951: Report on the property of Horegold A gold-bearing vein system and shear zone Red Lake Mines Limited, McDougaH©s (R. Moretti property, no. 71 was discovered in Mills, Ontario; unpublished report in Geology by R. O. Page, E, B. Moller, and assistants, Ontario Geological Survey, 1978. 1938, drilled and bulk sampled by Coinages Mines cluded with the March 19b2 Pros Limited in 1940-1941, and redrilled and sampled pectus ot Floregold Red Lake Mines Geology is no l tied to surveyed lines. by Florcgold Red Lake Mines Limited m 1950-52. Limited, 5p.; obtained from library Base map derived from Forest Resources Inventory maps, Lands and This deposit is notable as visible gold is ieported files, Northern Miner Press, Toionto. Waters Group, Ontario Ministry of Natural Resources. (Hutchison 1941a, b; McCombe 1950, 1951) and assays for some 15 tons of material from two lo Page, R, O. and Clifford, P. M. Assessment Files Research Office, Ontario Ministry of Natural Resources, 1977; Physical volcanology of an Archean cations along the veining returned 0.41 to 0.6/ l oronto. vent complex, Minn.taki Lake area, Bawden ounces gold per ton, across an average width ot ; Geological Sur Ra civ L Alcona-Split Lake Area; Map No, 46c, to accompany Ontario Department 2.8 feet (0.8 m). In 1963, Consolidated Bellekeno Batchelor vey of Canada Benoit of Activities, of Mines Annual Report Volume 46, Part 6, 1937, by H, C. Horwood. Mines Limited (no. 3] examined a gold occurrence Paper 77-1A, 441-443 in the northeastern portion of the map-area. Lake Abram Lake Sheet; Ontario Division of Mines Map 2243, 1972, tay F, J, Johnston Considerable exploration activity in the late Pettijohn, F. J. 1936: Geology of East Bay, M.©iinitaki Lake, 1940©s and early 1950©s also resulted in a gold Magnetic decimation m the area was approximately l ©E, 1978. D : stnct of Kenora, Ontario; Journal discovery by E. S. Richards (no, 10) and explora of Geology, Vol.44, pp.341-357 tion of veining by other groups (nos. 2 and 16). This map is published with the permission of E. G. Pye, Director, Ontario No assays are reported for the latter, but addi Turner, C. C. and Walker, R. G. Geological Survey. tional work in 1963 at no. 10 for Bankfield Con 1973: Sedimentology, stratigraphy, nml crus solidated Mines Limited yielded erratic values tal evolution of the Archean greenstone Mcltic Conversion Factor: 1 foot 0,3048 m from nil to 2.5 ounces gold per ton (Holbrook belt near Sioux Lookout, Ontario, 1963). The Richards Occurrence is somewhat Canadian Journal of Earth Sciences, Issued 1979 anomalous, as silver values are ^eporled {Bergmann Vol. 10, p.817-845. 1951) and the country rock for the veining is Walker, R, G. and Pettijohn, F. J. partially to extensively caibonatized, as is the InformsTion from this publication may be quoted if credit is given. It is 1971; Archean sedimentation: analysis ot the recommended that reference to this map be made in the following form: ground in the vicinity of the only major silver Minnitaki Basin, Northwestern Ontario, mineralization in the map area (W. M. Thompson Canada; Bulletin of the Geological Page, R. O. and Moller, E. B. 1979: Zarn Lake Area (Southern Part), District of Kenora; Ontario propeity, no. 15). Society of America, Vol.82, p.2099- Geological Survey Preliminary Map P.2233, Geological Series. Exploration of quart7-car Donate veining in 2130 Scale 1:15 840 or 1 inch to ^ mile. Geology 1978. highly sheared quartz-sencite rocks at no. 15 was begun around 1964, and options have been taken