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6mngqp Ministry of Hon. James A.C. Auld Minister P ,6nmpg . -*. ! v^ Natural Dr. J. K. Reynolds 6m(m)rspg"^v 6rnnpq \ Resources Deputy Minister Gmnpgempg Ontario ©y -t-^yri 6m np 6mnpg MARGINAL NOTES in irregular contact with the leucocratic trondhjemite geological mapping of the claim-group followed but the rocks of the "Bamaji Lake Complex", A variety of por mineralization was determined to bc uneconomic (Sage phyritic to equigranular trondhjemite lo granodiorite ONTARIO GEOLOGICAL SURVEY LOCATION AND ACCESS and Breaks 1976). * 6mnpg dikes and sills ranging from less than 0.5 m to several Molybdenite mineralization occurs sporadically PRELIMINARY MAP R2247 The centre of this map-area is located 128 km NNE tens of metres wide intrude the rnct?voicanics in such throughout the larrje island but most of th? known min Snmrpq of Sioux Lookout and 96 km WSW of Pickle Lake. numbers that the contact is difficult to delineate pre 6mnrpg GEOLOGICALSERIES eralized veins are restricted to the two northeasterly Access to the area in the summer is restricted to float- cisely, Those nvnor intrusions appear to be related to trending peninsulas on the north shore of the island and equipped aircraft available for charter from Sioux Look the "complex". out, Red Lake and Pickle Lake. Within the area, excel to a small island located about 300 m north of (he GmChJpg SLATE FALLS AREA lent water access is provided by the extensive lake system The northwestern part of the area is underlain by eastern-most peninsula. The molybdenite occurs with Gmgp including Fry, Bamaji, North Bamaji, Wesleyan and granitic rocks ranging in composition from biotite trond pyrite and traces of chalcopyrite and ©S confined to a Kezik Lakes, which interconnect with large lakes of the hjemite and quart? diorite to granite. Although distinct complex series of quartz veins, lenses, and pods and, to a Grnpg (Western Part) Cat River-Albany River drainage system to the north contacts between these phases ere generally difficult to limited extent, the adjacent host rocks. Gmq DISTRICT OF KENORA (PATRICIA PORTION) trace, throughout much of that area there appear to be e ct6mgp west and southeast. The contacts of the veins with host rocks range from number of discrete, relatively homogeneous masses veiy sharp to grudational, even within individual veins. Frequent aircraft traffic from Sioux Lookout services characterized by one or two predominant phases. In Scale 1:15840 The lenses and v^ins are very irregular in terms of shape, the small community at Slate Falls where telephone, the ex trcme northwestern part of the map-area however, .. radio and postal facilities are available. size, orientation, and continuity. The amounts and types Gpg Mile ^ the intrusive history is very complex, with four or five dST6 rezs: of sulphide and accessory minerals are also highly variable A major-hydro-electric transmission line which fix- major phases plus several minor intrusive varieties com 6sg Metres iuoHHH- o 0.4 0.6 i Kilometre both within and between individual veins. ^z: ST tends from Ear Falls to Pickle Lake transects the map- mon! v oc:cuiring in single outcrops. In general the oldest Sspg/©Gmspg area. phases are trondhjemite and the youngest are quartz Molybdenite is present as disseminations, banded Kezik monzonitic to granitic. There also appears to be a general dissemination nai row sParm and veinlets, disseminated The nearest road, all-weather highway 599 passes Barnie 6n1atk t©-*6mlba NTS Reference: 52O/4E, 5E progression from the homogeneous tiondhjemitic zone clots, and as a thin paint within the quartz veming but about 80 km to the east, and can be reached fairly MHh around North Bamaji Lake, northward into a more com minor stringers and dissRminations a ! so occu^ within the ODM-GSC Aeromagnetic IViap: 892G, 893G easily from the map-area by boat or snow vehicle via adjacent host rocks \ Roadhouse Lake. Blackstone Lake, and Lake St. Joseph. plex zone in which granodiorite phases are predominant, 6mqp(m)g ODM Geological Compilation Map: 2218 and farther northward into the very complex zone in Pyrite is the most abundant sulphide and it is present Gmqsg "em^pgl^Srpg which phases of granodiorite and quart? monzonite are ODM Geophysical Series Prelims: P.1080, P.1083, P. 1081. P.1084 MINERAL EXPLORATION HISTORY within the quartz veins, along the quart? vein contacts, both common. Approximate contacts between these and in the immediate host rocks as disseminations to Prospecting for gold began in this region in the late zones are shown on this map. semi-massive and massive patches. Chalcopyrite occurs 1920s after discoveries around Red Lake to the west and OMNR-OGS1979 very sporadically and only in Trace amounts within the Pickle Lake to the east. In 1927 a gold prospect was Northeast of Fry Lake supracrustal rocks are intruded quart? veins. HydraTion, and oxidation products, in staked by P. Tivy near the southwestern shore of Wes by massive hornblende granodiorite to syenodiorite of Parts of this publication may be quoted if credit is given and the material cluding fernmo©ybdite, limonite, and malachite, ,re leyan Lake (Laird 1930 p.22). The same ground was re- the subcircular Obaskaka Lake Pluton (Sage and Breaks is properly referenced. 1976), Minor intrusions of felsic to intermediate feldspar common. staked and worked extensively by A.B. Connell, J.H. Stirrett and S. Williams in 1934 (Harding 1935 p.68). and quartz porphyry are common particularly south of Molybdenite occurs :n numerous, small showings Fry Lake where they cut mostly mafic pillowed flows. In 1971 Cochenour Willans Gold Mines Limited put down along The northeast and southwest shores of Senior Lake. By far the largest of these bodies is a massive feldspar four shallow diamond drill holes in this general vicinity. The largest of thfise showings is located at the entrance porphyry plug, about 3 km by 1 km in dimensions, A second gold occurrence was found by Connell Mining to the large bay in thp north-central region of Senior located on the southeastern shore of Fry Lake. The and Exploration Company Limited on the north shore Lake. It consists ot a mineralized quartz vein that oc number and size of minor sills and dikes increase with of Fry Lake in 1935 (Harding 1935 p.69). This property cupies the intrusive contact between j fine- to medium- proximity to the Bamaji Lake Complex in the central was acquired in 1946 by Fticka Red Lake Gold Mines grained ©felsite© to the south and a weakly foliated to part of the area and to a lesser extent to the aforemen Limited, and considerable prospecting, trenching and unfoiiated, epidote-biotite trondhjemite to granodiorite. tioned porphyry plug in the eastern part. Pegmatitic, diamond drilling took place between 1946 and 1948 The ©felsite© .s mineralized with fine grained,disseminated (Source Mineral Deposit Records, Ontario Geological aplitic and felsic feldspar porphyry injections arc ubiqui pyrite and is cut by tiny epidote stringers. Both of the tous within the Bamaji-Blackstonc Granite and the Survey, Toronto}. intrusive phases are cut by minor dikelet? nt coarse- immediate contact area, and in much of the northwest y rained to pegmatoid quantz mon7oiite The quartz vein A gold-silver occurrence at the eastern end of Bamaji ern part of the map-area, is about 20 cm at its widest and best miner ail zed location Lake was trenched in 1965 by Dome Mines Limited and and it pinches out to i h e east and west. Molybde-rvte Sigma Mines (Quebec) Limited, but only low values were Mafic sills appear to be very common within the southern Fry Lake metavolcanic sequence and in the minerali73tion ot locally up to 15 percent MoS2 occurs reported (Resident Geologist©s Files, Ontario Ministry of north-central part of the area, but m many cases these as disseminations, banded disseminations, small stringers, Natural Resources, Sioux Lookout). In the same area in ^^Gn wiTinpr ^ bncKx* V^S ,V rucks arc indistinguishable from coarse amphibolitizcd and a paint, primarily within the quart? vein with 1974 Dome Exploration (Canada) Limited perforrred disseminated pyrite. Pyrite occur; in varying amounts Xr^^^r^^V^ ground magnetometer and electromagnetic surveys. mafic flows. Mafic to intermediate sills are also common within the supracrustal sequence along the axis of Bamaji ove r !hc entire exposed iength of the quart2 vein (ap The Sandetsos Option, a gold silver occurrence lo Lake. Some of the larger bodies may be differentiated proximately, 25 mi but the presence of molybdenite "s cated about 5 krn northeast of Slate Fails was investi sills containing ultramafic and anorthositic phases. With restricted to only about 5 m of the vein. gated in 1 966 by Cochenour Willans Gold Mines Limited. in the southern trondhjemite body, numerous linear Four, adjacent occurrences are present to the north Extensive stripping and trenching were carried out, and /ones of amphibolide inclusions and one broad tabular east of the jame iorge bay along the northwester", srwe Scale: 1:1,584,000 or 1 inch to 25 miles nine diamond drill holes totalling 450 m in length were zone of coarse porphyroblastic pyroxenite arc also M nor pyrite and traces of molybdenite r chalcopyrite put down (Sage and Breaks 1976 p.322). believed to be the remnants of mafic and ultramafic occur in small, irregular quartz-potassium feldspar veins; Uranium occurrences were discovered south of intrusions A few outcrops of peridotite rocks were Innsfis The host rock is a weakly foliated biotite ttond- Moosetfjgon Lake m 1953 by McCombe Mining and found in the north-central parr of the area north of hjemite to granodiorite with d f R w, small, m^iT inclu LEGEND1 Exploration Limited. Eleven shallow diamond drill K^ginot L ake, but the size and shape of the intrusion^} sions thaT is cut by ©©elyite© dikes o* variable a li©h. holes totalling l 72 m were put down at thai time (Resi involved could noT be determined with certainty. The PHANEROZOIC Along the southern shoie of Senior Lake clue east of dent Geologist©s Files, Ontario Ministry of Natural Re metamorphic grade throughout the supracrustal se The previous showings, a small occurrence of molybden CENOZOIC sources, Sioux Lookout). This area was re-examined by quence appears to range from low (mid to upper green ite was found in a quartz vein system, within weakly 6nmpq Gmpg QUATERNARY Kirkland Townsite Gold Mines Limited in 1968 when an schist facies) to moderate (lower amphibolite facies). foliated, biotite-rich (locally chloritized), trondhjemite PLEISTOCENE AND RECENT airborne spectrometer survey was flown, and geological Outcrop constitutes between 20 and 30 percent of to granodiorite. Fracture-controlled epidote veinlets and mapping and considerable trenching took place (Resi Till, sand and gravel (ground moraine and esker deposits) this area, and drill hole data suggests that Quaternary stringers are also present with abundant iron and possible dent Geologist©s Files, Ontario Ministry of Natural Re UNCONFORMITY overburden is quite thin. The esker in the north-central silica metasomatism adjacent to them. Fine- to medium- sources, Sioux Lookout). From 1969 to the present R. part of the map-area forms the only notable Pleistocene grained, disseminated cubes of pyrite and disseminations Knappett has done further prospecting and trenchmu 957AtfC)7tf/? PRECAMBRIAN 2 feature. and disseminated clots of molybdenite are restricted to in the area. A number of smaller uranium-thorium EARLY PRECAMBRIAN (ARCHEAN) the quart? vein material. Molybdenite is present in a- showings have been located by Mr. Knappett east of the FELSICTO INTERMEDIATE INTRUSIVE ROCKS STRUCTURAL GEOLOGY mounts up to 2 percent but this mineralization is very eastern end of North Bamaji Lake, and gold values have local in extent with many nearby quartz veins be ; ng been reported along with the uranium thor mm (R. Three major folds appear to control the structure in 6 Unsubdivided essentially barren of any sulphides. Knappett, personal communication). A small copper- the supracrustal sequence in this area. The largest and Ga Foliated leucocratic biotite trondhjemite, commonly best defined is a complex anticline, part of which has silver occurrence just south of the easternmost extremity A number of small, scattered molybdenite occu© - gneissic of North Bamaji Lake was also found by Mf. Knappett. an east-plunging axis and an east-trending axial trace rences arc present along the Cat River channel flow.nq 6b Massive to moderately foliated hornblende, biotite- passing through the northern part of Fry Lake. East of south fiom North Bamaji Lake ©iito Bamaji Lake, pri -,/ t 6 hornblende trondhjemite, quartz diorite, commonly Several occurrences of molybdenite with pyrite and r/ *- Kaginot Lake the fold forms a domal structure with marily along the western shor*1 . Trace amounts of xenolith ir: in some cases with chalcopyrite have been found around divergent axes curving to the north and southwest. The molybdenite occur in quartz and quartz-feldspar veins.© 6c Foliated leucocratic biotite trondhjemite commonly North Bamaji Lake since the discovery of the Loon Pros north-trending pdrl of the fold which is relatively open, veinlets and as disseminations within ttie country rocks. cataclastic and porphyritic pect (Sage and Breaks 1976 p.319) on the north shore of has an a curate axial traco which ex to i ids northward Host rocks are mostly highly sheared and reciystallized, 6d Biotite, hornblende-biotite quartz monzonite, grano the largest island in the lake in the early 1960s. From out of the map area betwoen Burley and Scanes Lakes. frequently quartz porphyroblastic, biotite to muscovite- diorite (pegmatitic to fine-grained massive) 1965 to 1968 Cochenour Willans Gold Mines Limited Facing criteria art© lacking in this part of the area. The biotite trondhjemite and granodiorite. An abundance Be Feldspar-quarU porphyry, quartz porphyry did trenching, geological mapping, and 786 m of dia structure is interpreted from lithologic and aeromagne of medium grained to pegmatitic quartz monzonite *, ©6npm^ 6f Quartz-feldspar porphyry, feldspar porphyry mond drilling around the Loon Prospect site (Resident tic data and from outcrop distribution patterns visible dikes cut the country rocks in this area but no molyb , 6mng 6g Pegmatite, aplite (minor quartz monzonite dikes and Geologist©s Files, Ontario Ministry of Natural Resources, on air photos. The southwest-trending part of the fold denite was found in these. Evidence for metasomatism fir/n sills) Sioux Lookout). system has an axial trace sub-parallel to the arms of and ©or e 11; men t remobili/ation is present in biotite 6h Non-porphyritic felsite (minor fine-grained trond- In the period from 1969 to 1974 a great deal of ex Kaginot Lake. Limited facing criteria available indicate stringer veinlets that cut the foliation; local abundance hjemitic dikes! ploration activity occurred across this region principally that this is an anticline. Closure to the southwest, which of prismatic tourmaline, espec.ally in very highly sheared 6k Hornblende granodiorite, syenodiorite (commonly in search of base-metal sulphide deposits. In 1970, is evident from aeromagnetic data, suggests that this zones; patchy disti ibutirjn of potassium feldspar in many porphyritic and foliated) Canadian Onex Mines Limited flew a combined airborne part of the main structure is southwest plunging. of the rocks; and very broad zones of rvgh shear and 6m Equigranular leucocratic biotite trondhjemite massive magnetometer and electromagnetic survey over the cen The second major fold within the map-area is an abundant sericitization resulting ,n extensive muscovite- lo weakly foliated tral part of the map-area. This was followed up m 1971 east-trending syncline which is defined by aeromagnetic chlorite schists. Most of the showings of molybdenite t ? 6n Massive equigranular biotite granodiorite with an induced polarization survey in the area to the and outcrop distribution patterns and foliation patterns are present as tme- to medium-grained, disseminated V 6p Massive biotite quartz monzonite north of North Bamaji Lake (Assessment Files Research within relatively monotonous meLavolcanic rocks. The flakes which are commonly oriented across the foliation 6q Massive porphyritic biotite trondhjemite Office, Ontario Geological Survey, Toronto). axial trace extends from east of Moosetegon Lake, pass along late stage fractures. One such fracture had a small 6r Massive porphyritic biotite granodiorite In 1970-71 Cochenour Willans Gold Mines Limited, ing north of North Bamaji Lake to north of Konegon lens of aggregated molybdenite flakes along it. The re 6s Massive porphyritic biotite quartz monzonite in a joint project with Selco Exploration Company Lake where closure is obvious. Limited facing criteria maining showings occur as very small pods (2-3 mm) or INTRUSIVE CONTACT Limited, performed a combined airborne geophysical and minor structural elements confirm this to be an as disseminations of molybdenite along the outer edges survey covering much of the present area. This was east-plunging syncline. of snidll, irregular quartz and quartz potassium feldspar METAMORPHOSED MAFIC AND ULTRAMAFIC INTRUSIVE veins/we in lets. ROCKS followed immediately by a large number of ground A third major fold has an axial trace which extends magnetometer and electromagnetic surveys, geological sub-parallel to the power transmission line south of Other showings in the area, such as those on Kezik 5 Unsubdivided and geochemical mapping and sampling programs, and Moosetegon Lake. Interpretation of this fold is based Lake and around the southeastern part of Bamaji Lake, 5a Massive yabbro considrr.ible drilling scaMeri©d throughout those parts of on strong aeromagnetic evidence indicating closure to are very small, consisting of only a few flakes of molyb 5b Porphyritic gabbro the area underlain by supracrustal rocks (Assessment the northeast, and foliation patterns indicative of an denite either disseminated in granitoid rock or in ruin 5c Schistose to gneissic gabbro Files Research Office, Ontario Geological Survey, antiformal structure. eralized quartz veins. They are believed to be too limited 5d Schistose to gneissic diorite, quart? diorite Toronto). in extent to attract further interest. 5e Granoblastic ultramafic amphibolite (metapyroxenite) As is evident from this map, major faults and shear 5f Lamprophyre In 1973 another airborne geophysical survey, in /ones and major topographic lineaments believed To be Copper: Chalcopyrite along with pyrite and molybdenite 5h Peridotite cluding most of the present area, was commissioned by related to faults are numerous in This region, Generally occurs sparsely disseminated within the trondhjemite of 5k Fine-grained, equigranular, porphyritic andesite (minor Union Miniere Exploration and Mining Limited. Dia these features are indicated simply as lineaments unless the Bamaji Lake Complex, and known quartz vein dikes) mond drilling of anomalies southwest of the western end stratigraphic offsets across them were positively identi molybdenite deposits such as the Loon Prospect invari of Fry Lake, north of Rockmere Lake, and in the north fied. The most prominent fault runs down the length of ably contain significant chalcopyrite. Significant copper INTRUSIVE CONTACT eastern corner of the map-area took place in 1974 (Ass Bamaji Lake parallel or sub-parallel to the strike of the contents from shear zones and associated quartz veins METAVOLCANICS AND METASEDIMENTS 3 essment Files Research Office, Ontario Geological Sur supracrustal rocks. Rocks on the north shore of the lake cutting metavolcanics were also reported in such places vey, Toronto). are intensely sheared, and spectacular veinlets of pseudo as the Sanderson Option north of North Bamaji Lake METASEDIMENTS Since 1974 very little exploration activity has been tachylyte are quite common over a width of at least 200 (Sage and Breaks 1976 p.322), and the Knappet dis Chemical Metasediments reported,, but recent renewed interest has been shown in m across the fault zone. The abundance of perfectly covery south of the eastern end of North Bamaji Lake. 4 Unsubdivided the gold and uranium potential of the area. preserved pseudotachylite suggests that shearing along Minor amounts of chalcopyrite with much more 4a Chert, commonly laminated to finely bedded this zone was late in the deformational and metamorphic abundant pyrite and pyrrhotite have been reported 4b Interbedded quartz-magnetite ironstone and chert GENERAL GEOLOGY history of the area. from diamond drilling and other exploration work in 4 r. Calc-silicate rock (actinolite©dolomite-calcite-biotite- Up until 1977 when the current O,G.S. mapping pro Several northeast-trending faults and lineaments meet mafic metavolcanics, intermediate to felsic pyroclastic quartz), massive to weakly layered grdm began, geological work in this area had been the main fault zone at acute angles. None were observed rocks, felsic to intermediate intrusive rocks, mafic restricted to large scale reconnaissance mapping. Most to cross the main fault. In the central part of the area intrusive rocks and chemical metasediments in many Clastic Metasediments parts of the area particularly noith of centra! Fry Lake. Wesley of the present area was surveyed by Harding (1935) several major and numerous minor east-trending faults 3 Unsubdivided Rpported assay values h owe vet have shown only traces at a scale of 1 :126 720 or 1 inch to 2 miles. In 1960 it and shear zones splay out from the main fault zone and 3s Slate, argillite of copper. was mapped by Elmslie (1960) at 1:253 440 or 1 inch to extend across the "Bamaji Lake Complex", giving rise to 3b Feldspathic wacke 4 miles as part of the "Roads to Resources" program. its general cataclastic character. In the north-central part 3c Lithic wacke RECOMMENDATIONS FOR FUTURE MINERAL EX Most recently mapping was done in 1972 as part of of the area between Kaginot Lake and the northern part 3d Pebbly sandstone PLORATION Operation Pickle Lake (Sage and Breaks 1976), from of Fry Lake, the rocks are cut by a number of northeast- 3e Conglomerate which maps were prepared at a scale of 1:126 720 or and northwest-trending fault sets which severely compli Although disseminated sulphide mineralization (py- 3f Biotitfl-plagiodase-quartz schists 1 inch to 2 miles. This region is underlain by a variety cate stratigraphic correlation in that part of the supra u©te and pyrrhotite) is widespread in the trondhjemite 3g Paragneiss, migmatite of metamorphosed Early Precambrian (Archean) supra crustal sequence, Very strong linear features are common rocks nc;r rhr southern shore of North Bamaji Lake, crustal and intrusive rocks belonging to the Uchi Belt in the large areas in the northwestern and southeastern nearly all LI* tl"- molybdenite and chalcopyrite found in METAVOLCANICS geological subprovince (Ayresera/. 1971). part of the map-area underlain hy granitoid rocks. Most mapping the art©.i is restricted to quartz ve©ii occurrences. Felsic to Intermediate Metavolcanics of these are probably faults but definitive crrltiiia re Where disseminated molybdenite was observed evidence A succession of metavolcanics and metasediments 2 Unsubdivided cognisable on the ground are generally lacking. suggested that its formation post-dated the pervasive occupies most of the northeastern part of the area 2a Massive flows, related autoclastic breccias^ mineral foliation. This tends to run counter to the theory around Fry, Moosetegon and Kaginot Lakes The se 2b Pillowed flows, related autoclastic breccias ECONOMIC GEOLOGY that the mineralization heio is of the "porphyry-type" quence narrows across the central part of the area north 2c Lithic, crystal-lithic tuff (Wallace 1977 p.8* Instead, the concentration of the of North Bamaji Lake and pinches out north of Konegon Gold and Silver: Gold and/or silver values have been re 2d Crystal, lithic-crystal tuff molybdenite chalcopyrite occurrences near the southern Lake in the west. Metavolcanics are predominant, with ported from most of the base metal and uranium show 2e Lapilli-tuff ings in quartz veins and shear zones, but few precise part of the "complex" m and near quart? veins and major metasedimentary units occurring only along the 2f Lapillistone pegmatite bodies which also clearly cross-cut the host northern and southern contacts with surrounding plu assay results are available. Several of these are described 2g Tuff-breccia tonic masses. Between Fry Lake and Bamaji Lake the in the following sections. rocks© mineral foliation suggests that the hydrothermal fluids which produced the mineralized veins were very metavolcanics are moslly mafic pillowed and massive One occurrence under recent investigation primarily Mafic to Intermediate Metavolcanics much later than the "complex" intrusive event, and flows with very few felsic to intermediate units. Many for gold and silver is known as the Sanderson Option that they may have been derived from the younger 1 Unsubdivided of these mafic flows are variolitic but most are equigran located 5 km northeast of Slate Falls (Sage and Breaks quartz monzonitic body to the southwest of North la Massive, aphanitic to fine-grained flows, commonly ular amphibolite varying from aphanitic to very coarse 1976 p.322). Pyrite, sphalerite, tetrahedrite, pyrrhotite Bamaji Lake. If these inferences are correct the grani variolitic, related autoclastic breccias grained. Several flows some pillowed believed tc be of and galena occur disseminated within narrow quartz toid terrain in the southwestern part of Bamaji Lake 1 b Pillowed flows, commonly variolitic, related auto basaltic komatiite composition, exhibiting well pre veins following an east-trending shear zone which cuts served spinifex textures are exposed along the central warrants investigation for molybdenite. clastic breccias mafic metavolcanics. One sample of mineralized quartz 1c Pyroclastic rocks part of Rockmere Lake, but the extent of this distinc was assayed and found to contain 34.41 ounces of silver Although economically significant deposits of uran tive sequence is not known. Id Massive medium-grained amphibolite, garnetiferous per ton, 0.47 ounces of gold per ton, and 1.49 porrent ium-thorium in Early Precambrian {Archean} rocks are amphibolite The only major felsic to intermediate metavolcanic copper (Sage and Breaks 1976). A gold occurrence rare, the potential ©for this commodity here should not le Gneissic medium-grained amphibolite, garnetiferous sequence south of Fry Lake occurs along the northern known as the Connell-Stirrett-Williams group (Harding be discounted. The considerable strike length of the amphibolite main uranium showing south of the western end of shore of Bamaji Lake apparently overlying the northe n 1935 p.731 on the southwestern shore of Wesleyan Lake If Migmatized mafic metavolcanics Moosetegon Lake, and the probability that other similar mafic sequence. Dacitic to rhyolitic pyroclastic units al was examined in the 1930s. Pyrite, chalcopyrite and gal lg Fragmental mafic metavolcarncs (unsubdividedl showings occur along strike, suggests that a chemical together dbout 200 to 300 m thick strike parallel to the ena occur in an east-trending quartz vein from a few l h Coarse amphibolite^ metasedimentary unit comptismg appreciable tonnages shore along much of the length of the lake. Most ot the centimetres up to 2 metres wide. The vein follows the 1 k Basaltic komatiite flows, commonly exhibiting spinifex may be involved. Detailed radiometric surveys should be uri©ts a:c thin woi© bedded but highly sheared monohfhic contact of a small trondhjemite sill with the surround texture lapilli-tuff and lapillistone, but there are some relatively ing mafic metavolcanics. Harding ( I935I reported assays performed in this area particularly along strike to the thick units (1-2 m) which may be classed as heterolithic as high as 0.15 ounces of gold per ton from a selected east and west of the main zone, in order to establish the Notes: lapillistone and tuff-brecria. Thinly bedded lithic tuff mineralized grab sample, but indicated That assays as dimensions of the known calc-silicate unit and possibly 1 This is basically a field legend subject to change as a result of fu©ther and quartz- and feldspar-hearing crystal tuff units are high as 0.5 ounces of gold per ton had been attained. to find other similar units. The east-northeast trending field work and subsequent laboratory investigations told structure interpreted in this area suggests that common in a few places. In the area around the Fiv- 2. Subdivisions ol major rock units do not indicate age relationships. The Flicka Red Lake gold occurrence is located on similar stratigraphy may be found between Rockmere Bamaji Lake Falls the pyroclastic rocks are sepaiaird This is a lithologic map; rocks similarly classified may be uf ve©y dif the northwestern shore of the central arm of Fry Lake. and Moosetegon Lakes and south of the northern half from the mafic sequence to the north by a wedye of It consists uf at least three northwest to north-northwest- ferent age and stratigraphic position. polymictic orthoconglomerate. In the south-u©ntial of Moosetegon Lake. trending qujrtz veins cross-cutting coarsely amphiboli- 3. Age relationships between rocks coded as 1, 2, 3 and 4 are variable and parr of the area, south of North Bamaji Luke conglomer tized mafic I©let.wolcanics. The Three veins which have The metavolcanic sequences exposed along the large m many cases uncertain. atic units containing high propo: lions ol trondhjemite bays north ot the western arm of Fry Lake and in the been traced for distances of 1 8, 20and 30m respectively, 4. May in part be intrusive clasts occupy similar stratigraphic positions. This conglo dip moderately steeply to the east. The quart? veins con southern part of Kaginot Lake contain high proportions 5. The letter "G" preceding a rock unit name (?g G4) indicates that the meratic sequence is believed by the author to uncon- tain disseminated pyrite, arsenopyrite and tourmaline of intermediate to felsic pyroclastic rocks not noted on interpretation is based on geophysical data only. formably overlie the trondhjpmitic body around North and highest gold values are reported (Cumming 1945 previous maps. Many of these units include phases as Bamaji Lake, Hence the pyroclastic sequence aioruj The p.2) to bc associated with the arsenopyrite. Mineralized coarse as tuff-breccia and pyroclastic breccia. The larger 6. Screened area indicates the approximate extent of the Bamaji Lake Bamaji Lakeshore belongs to a discrele cycle of volcanism shear zones parallel to the east-striking supracrustal tephra are commonly rhyolitic to rhyodacitic in compo Fault zone, rocks characterized by extreme shearing, cataclasis and considerably younger than that represented bv rocks rocks were also reported to contain gold up to 9.14 sition. Although visible sulphide mineralization appears development of pseudotachylite. further north. ounces per ton over 51 cm in dn 1 ! core (Cumming relatively sparse in these rocks the area would appeal to 1945). Gold values from channel sdmpics across the be worthy of further examination because lithologies Along the southeastern shore of Bamaji Lake and METAL AND MINERAL REFERENCES along the northern sidr? of the islands in the lake, f©-ie main vein ranged from 0.07 over 38 cm to 0,50 ounces present indicate an environment potentially favourable clastic metasediments are predominant. Most of These of gold per ton over 160 cm (Cumming 1945, p.2). to the deposiTion of synvolcanic base-metal sulphides rocks appear to be wackes now biotite-playioclase- Diamond drilling gave similar tesuits up to 1^5 m below and because there has been little previous mineral ex . . . . .Silver qv...... Quartz vein quart? schists. Porphyroblast* of garnet a"d andalusite surface. ploration in this part of the belt...... Gold S ...... Suiphide mineral Chalcopyrite sp. , . . . . . , ...... Sphalerite occur in some units but they are usually small. Despite The same general remarks apply to the relatively O O&cg Uranium: A number of uranium thorium occurrences arf . . .Graphite Th ...... Thorium metamorphic changes in textures and nvneralogv, bnd thin sequence of pyroclastic ror.ks along the north shore ^firing known in the aroj between Mooseteuon, Bamaji ^nrl Molybdenite U ...... Uranium ding and other primary scdimcntoiy structures are com of Bamaji Lake. This sequence represents a cycle of North Biimoji Lakes. Two OT these have oeen described . . Magnetite monly well preserved. Sparsely intercalated with these in some detail by Saye dnd Breaks (1976) and the mam volcanism significantly younger than that which affected clastic metasedimcnts are fine grained highly siliceous showing which is just south ot a small lake about 1 km other parts o* the area, with distinct chemical and metal laminated units, some of which are weakly magnetic. south of the western end of Moosetegon Lake is also logenic characteristics. These appear to be metamorphosed chert. described bv Bond and Breaks (19781. In the main GEOLOGICAL AND MINING SYMBOLS North of the east-west axis of Fiy Lake the supra showing radioactivity was found in a series of trenches crustal sequence consists predominantly of mafic to over a srrike length of 3t least 125 m. The uranium and Glacial striae. Geological boundary, intermediate pillowed flows interlayered with felsic thorium occjrs m what appears to be a stratigraphic un t observed. to intermediate pyroclastic units, mostly lapillistone, ot oalc-s hcate matena 1 up to 3 m wide sti iking approxi Esker. lapilli-tuff and well-bedded (waterlain) tuff and crystal mately 75 East, consisting of aerolite, calcite, dolomite Geological boundary, tuff. Some of the thicker pyroclastic units can be traced and magnetite. Adjacent to and parallel ©n t r pnd to thn position interpreted. for several kilometres but most are thin discontinuous calc-silicate unit in several trenches is what appears to be Small bedrock outciop. lenses. Most of these pyroclastic rocks are monolithic, a pvritiferouh chert or highly silicified pyroclastic unit. the most common clast type being rhyolite porphyiy. Highest scintillometer readings wet e obtained from the Ares of bedrock outcrop. Geological boundary, Commonly the matrix material appears somewhat more calc-silicate unit where it is rich in actinolite (host min deduced from geophysics, mafic than the clasts. Included in the mixed sequence eralogy for "he uranium-thorium has yet to be deter Bedding, top unknown; north of Fry Lakf are several units of magnetitic and mined). By companson the surrounding mafic metavol (inclined, vertical). Fault; (observed, assum pyritic chemical metasediments. These are rarely on- canics and ubiquitous sill-like trondhjemite to y i ano- ed). Spot indicates down countered in outcrop, but are known from drill hole dioriTic ©enses ga^e very low readings. Gold assays of Bedding, top indicated throw side, arrows indi data and can be traced in places on aeromagnetic maps 0.40 to 0.20 ounces per ton weie reported from pyriTic cate horizontal move REFERENCES hy arrow; (inclined, ver [ODM 1976a,b,c,d,c,f). cherT and pyrit©c Trondhjemite from trench PS at this tical, overturned). ment. showing (Saue and Breaks 1976 p.332). North of the metavolcanics, clastic metasediments, Ayres, L.D.. Lumbers, S.B., Milne, V.G. and mostly feldspathic wacke-mudstone successions, form a A second area of abnormally hiqh radioactivity is Lineament. Robeson, D.W. Lava flow; top (arrow) located about 700 m west of The main occurrence. In a relatively thick wedge overlying and in part inlet layered 1971; Ontario Geological Map, Northwest Sheet from pillows shape and with felsic to intermediate pyroclastic units, serifjs ot sha low trencnes, narrow vyinlets (2 to 4 cm) r^y^ Jointing; (horizontal, 2201, West Central Sheet 2199; Ontario De packing. of actmolitR-biotitfi arn seen to cut porphyritic biotitp inclined, vertical). Felsic to intermediate pyroclastic rocks are pi p- partment of Mines and Northern Affairs, trondhjerniti , Scintillometer readings indicate that dominant around the southern part of Kaginot Lake. scale l inch to 16 miles. Compilation 1970. Schistosity; (horizontal, MOST of the units consist of lapillistone and lapilli-©uff uranium thorium is concentrated within these veinlets inclined, vertical!. Anticline, syncline, Howevfji, anan!ysf*s of grab samples collected by Sage Bond, W.D. and Breaks. F .W. but coarse tuff-breccia was also mapped in several pla^-b. with plunge. and Breaks (1976) of the vein.er material and ot the 1978: Ground Evaluation of Airborne Radiometric The pyroclastic icqucnce appears to thin rapidly toward Gneissositv, (horizontal, surrounding trondhjemite gave values of 0.04 percent Anomalies; in Summary of Field Work, 1978 the north and south where mafic flows predominate. by the Ontario Geological Survey, edited by inclined, vertical). Drill hole; (vertical, U3Og and 0.06 percent UgOg respectively (Sage and inclined). Along the southern shore of Bamaji Lake the supra Breaks 1976p.332i. V.G. Milne, O.L. White, R.B. Barlow and J.A. crustal rocks are in contact with a large plutonic mass Robertson, Ontario Geological Survey Misc. Foliation; (horizontal, known as the Bamaji-Blackslone Granite (Sago and A third showing found by R. Knappett by rficon- Paper 82, 235p. inclined, vertical). Magnetic attraction. naisiance prospecting with scintillometer, is located Breaks 1976). Fur tho most part the contact i s reiairvely Cumming, J.D. about 600 m south of the eastern end of North Bamaji sharp except for numerous minor feldspar and quartz- 1945: Unpublished report on Flicka Red Lake Mines Bamaji Lineation with plunge. Radioactivity. Lake. It consists of a thin (less than 400.7 m) unit of feldspar porphyry sills which intrude the merasedimenrs Limited, Fry Lake, Ontario; 4p. calc-silicate mate©ial, predominantly actinolite. This North for a tew hundred metres to the north. In the extreme Emslie, R.F. Lake eastern part of the area the contact becomes migmatite. unit ©S somewhat similar to the host, rock in the main showing which is approximately 1000 m aiong the 1960: Geology Lake St. Joseph, Kenora and Thunder LIST OF PROPERTIES The pluton consists predominantly of leucocratic folia Bay Districts, Ontario; Geological Survey of regional stiike to the past. The unit is brecciated and ted and gneissic biotite trondhjemite within the map- Canada, Map 51-1960, scale 1 inch to 4 miles. area. This very homogeneous body is separated from the sunounded by trondhjemite rocks which exhibit very 1 Cochenour Willans Gold Mines Limited j 19731 low radiornetr i c characteristics. Max©mum scintillo Harding,W.D. 2. Dome Mines Limited - Dome Exploration (Canada) Limited [1974] supracrustal tocks to the north by a zone of massive© to 1935: Cat River-Kowinogans Lake Area; Ontario De foliated, commonly xonolithic, hornblende trondhjemite meter readings recorded here were generally a full order 3. Kirkland Townsite Gold Mines Limited [1968] partment of Mines, Annual Report Vol. XLIV, and quartz diorite, about 450 m wide for most of its of magnitude lower Than those taken a t the main showing. 4. Knappett, R. (Flicka Red Lake Gold Mines Limited [1947] ) pt. VI, p.53-75, Map 44f, scale 1 inch to 2 length. At least two other !,mal! uranium-thorium showings © 5, Knappett Silver Occurrence miles. 6. Loon Prospect Although the contact between the TWO predominant in similar environments have been found m the area between North Bamaji and Moosetegon Lake. All of Laird, H.C. 7. McCombe Exploration Limited [19541 ly trondhjemite bodies is not exposed It is believed to 1930: Shonia Lake Area, Appendix Cat River, On These showings may occur within the same unit or units 8. Sanderson Option be intrusive since inclusions similar to The hornblende- tario Department of Mines Annual Report in close stratigraphic proximity. A marked aeromagnetic 9. Senior Lake Molybdenite, Occurrence rich phase are common m the leucocratic biotite trond Vol. XXX.pt. 3, pp.22,23. 10. Tivy Gold Prospect hjemite especially near their mutual contact. anomaly coincident with the main showing and con formable with lithologic trends extends to the west Palonen, P.A. and Speed, A.A. 11. Union Miniere Exploration and Mining Corporation Limited [1973] The areas around North Bamaji Lake and th? south toward these other known occurrences. To the east, 1977: Fry Lake Area, District of Kenora (Patricia 1 2. Urangesellshaft Canada Limited (Bamaji Lake Uranium Occurrences) western corner of the map-area arc underlain tay leuco this anomaly wraps around the major anticlinal axis Portion}; Ontario Geological Survey Prelim. cratic biotite tiondhjcmitc which forms part of what running north of the transmission line and continues, Map P.1503, Sioux Lookout Data Series, scale hai been called the "Bamaji Lake Complex" (Sage and in the northern limb of tho fold where it is coincident 1:15 840 or 1 inch to V* mile. Data compiled SOURCES OF INFORMATION Breaks 1976 p.309). In general the rocks in that area are with a weak electromagnetic conductor (Palonen and 1977. characterized by high degrees of shearing and cataclasis. Speed 1977), to intersect the transmission line north of Sage, R.P., and Breaks, F.W. . Geology by Henry Wallace and assistants 1977 and 1978, Only two major phases, one a medium- to fine-grained the eastern end of Nor In Bamaji Lake whore some radio 1976: Operation Pickle Lake, Districts of Kenora, Base-maps derived from maps of the Forest Resources Inventory, Division equigranular trondhjemite and the other a medium- activity has been found (Sage and Breaks 1973). Hence, Patricia Portion, and Thunder Bay; Ontario of Lands, MNR. grained porphyroidal trondhjemite, were identified the evidence suggests that the uranium-bearing units may Division ot Mines OFR 5180, 531p., 2 appen ODM-GSC Aeromagnetic Series Maps 892G Wesleyan Lake, 893G Zionz within this part of the "complex". The highly deformed be of considerable lateral extent. Thickening of these dices (93 p.) and 7 charts (maps, scale 1 inch Lake, 9Q2G Blackstone Lake, 903G Obaskaka Lake; scale 1:63 360. rocks around North Bamaji Lake may be the equivalents units near the nose of the anticline is also a possibility. to 1 mile). ot less sheared granitoid Trondhjemitic to granodiorite ODM Aeromagnetic and Residual Total Intensity Magnetic Maps No. Molybdenum: The occurrence of molybdenite has been Sage, R.P., Breaks, F.W., and Troup, W.R. rocks which occur north of the lake. P.1080 Kezik Lake, P.1081 Upper Kaginot Lake, P.1082 Fry Lake, known for many years in several places within trondhje 1973: Operation Pickle Lake, Bamaji Lake-Lake St. P.1083 Konegon Lake, P.1084 Bamaji Lake, P.1085 Austin Lake; scale Joseph Sheet, District of Kenora (Patricia Along the southern edge of the western part of the mite rocks around North Bamaji Lake and the western 1:15840. map area highly foliated trondhjemite rock belonging Portion); Ontario Division of Mines. Prelim. end of Senior Lake. During tho present survey it was Map P.808 Bamajt-Lake St. Joseph Area. Ont. Div. Mines. 1973 by R.P. to the "complex" are intruded by massive granitic to also found in small quantities in localities around the Map P.808, Geol. Series, scale 1 inch to 2 Sage and F.W. Breaks. pegmatitic quart? monzonitic rocks related to the eastern end of -Bamaji LakcwithTn the Bamaji-Blackstone miles. Geology 1972. Map 44f Cat River-Kawinogans Lake Area in Annual Report Vol.44, Bamaii-Blackstone Granite, clearly establishing the rela Granite (Wallace 1977 p.7), and on the shotes of Kp?ik Sutherland, l.G. tive ages of the two intrusions. Lake south of Lemon Island. Many of These showings 1978: Molybdenum Mineralization in the Slate Falls Ont. Dept. Mines 1935 by W,D. Harding. Map P.1 503 Fry Lake Area, Sioux Lookout Data Series, Ontario Geologi Along the south side of the large bay in the outlet and prospects have been described in some detail by Area, in Summary of Field Work, 1 978 by the cal Survey 1977 by P.A. Palonen and A.A. Speed. from North Bamaji to Bamaji Lake, the upper contact ot Sutherland (1978). Much of the following is taken Ontario Geological Survey, edited by V.G. the "complex" is exposed. A regolithic unit about 3 m from his summary. Milne, O.L. White, R.B. Barlow and J.A. Assessment Files Research Office, Ontario Geological Survey, Toronto. Robertson, Ontario Geological Survey, Misc. thick separates trondhjemite to the north from conglo The larcjt©st and richest occur i ence of molybdenite Resident Geologist©s Files, Ontario Ministry of Natural Resources, Sioux meratic metasediments containing larpe trondhjemite in the area, known os the Loon Prospect, is located on Paper 82, 235p. Lookout. clasts to the south. This evidence supports the thesis the north central shore of the largest island in Noith Wallace, Henry Magnetic Declination 3 3 43©E, 1977. ,. . that the "complex" is epizonal in emplacement (Sage Bamaji Lake. Fust discovered by thp Loon fjmMy of 1977: Slate Falls Area, District of Kenora: p.4-8 in and Breaks 1976 p.309). In the central pgrt of the map- Slate Falls in the early 1960s, the property was then Summary of Field Work, 1977 by the Geolog This map is published with the permission of E.G. Pye, Director, Ontario area around Moosetegon Lake and the eastern end of optioned in 1965 to Cochenour Willans Gold Mines Ltd. ical Branch, edited by V.G. Milne, O.L. White. Geological Survey. North Bamaji Lake, i.he main metavolcanic sequence is Stripping, trenching, diamond diilling (784 m) and R.B. Barlow and J.A, Robertson, Ontario i /6cg \ i f Geological Survey, Misc. Paper 75, 208p. t-© \ \ S) Issued 1979

Information from this publication may be quoted if credit is given. It 4s recommended that reference to this map be made in the following form: Wallace, Henry 1979: Slate Falls Area Western Parr, District of Kenora (Patricia Por tion); Ontario Geological Survey Prelim. Map P.2247, Geologi cal Ser., Scale 1:15840or 1 inch to tt mile. Geology 1977,1978.