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Ministry of Hon. Alan W. Pope Minister Robbie Natural MARGINAL NOTES -J \- W.T. Foster Resources Deputy Minister LOCATION AND ACCESS Ontario The map-area, about 274 km2 , is bounded by Latitude morphosed gabbro occurs in the east-central part ot Maude Ihe map-area or 0.4 km east o* mile 4 on the Kimberly- 48D54©OQ"N, the northern shore of Lake Superior, and ONTARIO GEOLOGICAL SURVEY Longitudes 87*01©37" and 870 15©00"W. It includes Clark road, probably being a very late intrusion, All the townships of Stray and Priske, and the Town of these rocks have been intruded by pink porphyritic PRELIMINARY MAP P.2417 Terrace Bay. and non-porphyritic hornblende and fidrnblende-biot Ducell ite granite to granodiorite and syenite comprising the GEOLOGICAL SERIES The southern and eastern parts ol the area are readily Terrace Bay Batholith and the Ellis Lake Batholith. The accessible by Highway 17 and a logging road latter is almost entirely fault bound, whereas the for PRECAMBRIAN GEOLOGY r maintained by Kimberly-Clark of Canada Limited, mer, is not. which connects Terrace Bay with Longlac to the north ? : OF THE east, The northwestern and north-central parts of-(he Middle to Lake Precambrian rocks comprise diabase 48"5#©00© area are best reached by helicopter and fixed-winged, and lamprophyre dikes. Black, rusty weathering mag float-equipped aircraft netic diabase and olivine diabase dikes of west-nqr- thwesterly, northwesterly and northeasterly trend in TERRACE BAY AREA trude the supracrustal and granitic rocks and are WEST SHEET MINERAL EXPLORATION particularly numerous along the north shore of Lake Exploration activity in the map-area was carried out Superior. Mauve biotite lamprophyre dikes trending THUNDER BAY DISTRICT primarily for gold from 1896 to 1939, but later, explora west-south westerly occur, but are few in number. The tion was also extended to the search for copper, cop westerly trending diabase and lamprophyre dikes are per-molybdenum, copper-tead-zinc, and copper- probably Late Precambrian m age (Sudbury dikes, Scale 1:15 840 nickel mineralization in the period 1948 to 1977. Fahrig ef a/ 1965) and the northerly trending dikes V. Mil* may be of Middle Precambrian age {Marathon dikes, Mil* Fahrig etal. 1965) M*tr*s 100 O l Kilofi*trw Gold HJTH Commencing at t,,u turn of the century, gold explora The Cenozoic rocks occur as glaciolacustrine sand at tion consisting of surface and underground work was Terrace Bay, and as glaciofluvial sands, gravels, and boulder clay along the highway between Terrace Bay NTS Reference: 42 D/14E carried out in two areas, one in the southwest, within ODM-GSC Aeromagnetic Map: 2139G mafic metavolcanics close to their contact with grani and the western part of the map-area (Gartner 1979). tic rocks of the Terrace Bay Batholith, the second in ODM Geological Compilation Map: 2232 mafic metavolcanics in the west-central part of the STRUCTURAL GEOLOGY map-area, in the former area work was done on the The metavolcanics-metasediments are folded about original properties of the Otisse Mining Company (No. an east-plunging synclinal axis crossing the central 7). the Gold Range Mines Limited (No. 3), and the part of the map-area. The lithologic units dip steeply, Harkness-Hays Gold Mining Company Limited (No. aboul 85", and because of the plunge, they strike nor 18), all located west of Hays Lake; and on the original Parts of this publication may be quoted if credit is given and the material thwesterly in the northern part of the map-area, and is property referenced. Jedder Gold Mines Limited property (No. 2), located southeasterly in the southern part of the area. Subsidi east of Hays Lake, In areas underlain by mafic meta ary folds related to the major folds also occur, for ex d \Lake This map is published with the permission of E.G. Pye, Director, Ontario volcanics away from granitic contact zones, explora ample, in the southwestern part of the map-area. Intru Geological Survey tion was carried out on the original Schreiber Pyramid sion of the Terrace Bay Batholith has caused local Gold Mines Limited property (No. 21), the original distortion of the regional fold pattern, Cook Lakes Gold Mines Limited property (No. 4), and (No. 17), and the J.E. Halonen property (No, 19). Re Numerous phot o-lineaments cross the area, many of corded exploration work ended in 1939, and recom which are regarded as faults because of associated menced in 1*950 on the former Gold Range Mines Lim shearing, the offsetting of lithologic units, and topo ited (No. 3), Jedder Gold Mines Limited (No. 2), Cook graphic expression. The Ellis Lake and Syenite Lake Lake Gold Mines Limited (No. 4), and (No. 17). and Fault are prominent features that define the margin of J.E. Halonen (No 19), properties where surface ex the Ellis Lake Batholith. The trends of the longer faults ploration has been continued to the present time. and lineaments are northwesterly, northeasterly and north. in 1896 gold was found on the former Otisse Mining Company©s property (No. 7), located in the southwest ern part of the map-area. By 1898 five veins were dis ECONOMIC GEOLOGY covered by surface exploration. Two shafts, 400 feet McQuo apart were then sunk 52 feet and 39 feet on the main Gold vein, a 21/4 to 4 foot wide quartz vein trending north Gold occurs characteristically in quartz veins and min easterly and occupying a shear zone in mafic metavol eralized northwesterly and northeasterly trending canics The vein strikes N450E and dips vertically. It is shear zones within the metavolcanics. Gold in 500 feet long at the surface and is mineralized with vis amounts of 0.01 ounce per ton and greater, were ob ible gold, pyrite, galena, and graphite. One ton of ore tained from previously known areas and also from min was shipped for a mill test in 1898 Exploration contin eralized northeasterly trending shears (No, 5), (No. ued intermittently to 1936. In 1939 the main vein was 13), (No. 34), (No, 36), located during the current sur re-sampled by Sylvanite Gold Mines Limited with dis vey. couraging results A grab sample from the main vein at the Otisse Mine In 1918 surface exploration led to the discovery of a (No. 7), taken by G.A. Harcourt in 1936 (Harcourt LOCATION MAP set of parallel veins on the original Harkness-Hays 1938, p.20) gave on assay,by the Provincial Assay Offi Scale M 584 000 Mines Limited property (No. 18), located in the south ce, 0.20 ounce gold per ton. The best assay obtained western part of the map-area. Surface and under from the same vein by Sylvanite Gold Mines©Limited in ground exploration continued intermittently to 1935 1939 was 4 ounces gold per ton over 1.0 feet, appar during which time 8 parallel veins were discovered, 5 ently by channel sampling1 adits were driven on the veins with lateral develop LEGEND* ment for a total of 1635 feet, and one ton of ore was The best assay from the No. 3 vein at the Harkness- shipped for a stamp-mill run and a laboratory cyanide Hays Mine (No. 18). obtained .from channel sampling test. The most important vein discovered was the No. by Harkness-Hays Gold Mining Company Limited in PHANEROZOIC 3 vein which had a strike of N43"E and a dip of 700NW. 1929 was 40.7 ounces gold per ton over 10 inches© CENOZOIC It was a quartz vein 3 to 4 inches wide mineralized with Channel sampling of the same vein by Sylvanite Gold QUATERNARY pyrite. A 25 ton amalgamation mill was erected on the Mines Limited in 1939 gave an assay value-of 0.60 Pleistocene and Recent property and was operated in 1935. In 1939 the veins ounce gold per ton across 7 inches for 109 feet of vein Sand, gravel, and swamp deposits were re-sampled by Sylvanite Gold Mines Limited, but length1 the property was not further developed. A grab sample from the No. 1 vein of the former UNCONFORMITY In 1934 Schreiber Pyramid Gold Mines Limited (No. Schreiber Pyramid Gold Mines Limited property (No, 21), was incorporated and m 1935 their property, lo 21), taken during the current survey in the summer of PRECAMBRIAN 1980 and assayed by the Geoscience Laboratories, cated in the westcentral parfof the map-area, was ge MIDDLE TO LATE PRECAMBRIAN ologically surveyed. In 1936 a road was cut to the Ontario Geological Survey, returned a value of 0.35 property, camp buildings erected and equipment in ounce gold per ton. Another grab sample from the No. MAFIC INTRUSIVE ROCKS(DIKES) stalled. Surface exploration was carried out until 1937 2 vein taken during ttie current survey and assayed by the Geoscience Laboratories, Ontario Geological Sur 7a Diabase during which time five quartz veins were discovered in 7b Diabase, granophyric malic metavolcanics, 1600 feet of diamond drilling vey, returned a value of 0.01 ounce gold per ton. 7c Diabase, porphyritic - , was done in three holes, and an adit driven for 125 feet An assay of vein material from the No. 2 vein of the 7d Lamprophyre on the No. 1 vein, with 124 feet of drifting. This vein is original Gold Range Gold Mines Limited property (No. 7e Olivine diabase 12 inches wide and about 500 feet long. It is a quartz 3). from an unknown kind of sampling and made by Al- vein striking N5"W, dipping 50 to 55"W, and mineral lis Chalmers Manufacturing Company Mining Labora INTRUSIVE CONTACT ized with gold, chalcopyrite, and pyrite An open cut tory in 1936, gave 699 ounces gold per ton1 , The was made on the No. 2 vein, which is a 6 inch wide veins on the property were re-sampled by Sylvanite EARLY PRECAMBRIAN quartz vein 250 feet long striking NSO©W and dipping Gold Mines Limited in 1939 when a channel sample FELSIC INTRUSIVE ROCKS 450 E and mineralized with pyrite, chalcopyrite, galena, taken in the No. 3 tunnel from the No. 2 vein assayed sphalerite, and molybdenite. A small test mill was 049 ounce gold per ton across 10.9 inches for a 6 Unsubdivided erected on the property to treat bulk samples. Opera length of 25 feet1 . A grab sample taken in 1980 by the 6a Syenite-diorite tions were suspended in 1937 and in the same year Regional Geologist, Thunder Bay from the same vein 6b Feldspar porphyry Kenecho Gold Mines Limited acquired the property. In at the surface and analyzed by the Geoscience Labo 6c G ran ile-tonalite 1969 Zenmac Metal Mines Limited diamond drilled 5 ratories, Ontario Geological Survey, returned a value 6d Porphyritic or porphyroblastic feldspar holes on the property totalling 790 feet for R.W. Prtka- of 25.82 ounces gold per ton Assay values obtained 6f Aplite nen, by Gold Range Gold Mines Limited from placer de 6g Hornblende In 1934 Gold Range Mines Limited (No. 3), was incor posits on the property gave a best assay of 0.07 6h Hornblende-biolite porated and carried out exploration work on four par ounce gold per ton. 6k Biotile allel quartz veins on their property, located in the A chip sample across 14 inches, and a grab sample, 6p Porphyritic quartz southwestern part of the map-area, until 1937. This both taken from the Derraugh vein, on the current Wal 6y Quartz-feldspar porphyry work led to the discovery of seven veins, some of ter Acker property (No. 2), by GA Harcourt in 1936 6z Pegmatite which were parts of discontinuously exposed veins (Harcourt 1938, p.23) and assayed by the Provincial The strike of the veins was N3Q to 45DE and the dip 70 Assay Office, gave 2.19 ounces gold per ton and 1.31 INTRUSIVE CONTACT to 750NW. They were quartz veins 2 to 11 inches wide, ounces gold per ton respectively A grab sample 440 to 600 feet long and mineralized with pyrite, mol taken from the Derraugh vein during the current sur METAMORPHOSED MAFIC TO ULTRAMAFIC INTRUSIVE ROCKS ybdenite, and gold tellurides. Underground work con vey and analyzed by the Geoscience Laboratories, sisted of the extension of two adits previously driven - Ontario Geological Survey, gave 0.45 ounce gold per 5a Diorite on the veins, and the driving of a new adit. One of ton 5b Gabbro, amphibolite these adits was driven westerly for 85 feet, one north 5c Serpentinite erly for 140 feet with easl-west drifting, and the third The quartz veins comprising the McKenna-McCann driven northwesterly for 80 feet Four test pits wefe put prospect (No. 4), were assayed by the Cook Lake INTRUSIVE CONTACT down in the sandy area south of the veins and a shaft Gold Mines Limited in the period 1936 to 1937. The was sunk for 25 feet on the No. 7 vein in the southern best assay was 0,538 ounce gold per ton over 1.13 METAVOLCANICS AND METASEDIMENTS13 part of the property. A shipment of 70 pounds of ore feet for a length of 130 feet from one of the veins1 . A METASEDIMENTS was made for flow-sheet testing and gold recovery five ton bulk sample from this vein gave 1.13 ounce testa from the No. 2 vein in 1936. A small test mill was gold per ton. A grab sample taken from one of the 4a Chert, grey and black i used on the property for sampling the ore and camp veins during the present survey, and assayed by the 4c Wacke buildings were erected. In 1937 operations were sus Geoscience Laboratories, gave a value of 0.21 ounce 41 Wacke, garnetiferous pended, In 1939 three of the veins were re-sampled gold per ton. A 5-ton bulk sample from the Johnston- 4r Graphitic shale with pyrite 4- pyrrhotite by Sylvanite Gold Mines Limited but without further de McKenna Mine (No. 17), was reported to assay 0.81 Johnston- 4t Quartzite, grey ounce gold per ton (Harcourt 1938, p 25)- Nine char velopment. In 1970 surface exploration was carried McKcnna Minp! 4u Chert-magnetite ironstone out by R.W Pitkanen acter samples takeYi by P.S Broadhurst for Mina-Nova Au.Cu/n^py Mines Limited from Ihe main Mina-Nova vein which METAVOLCANICS In 1936 Jedder Gold Mines Limited (No. 2), acquired could not be located by the present survey; assayed Felsic Metavolcanics the property of Derraugh Exploration Syndicate lo up to 30 ounces gold per ton 1 . cated east of Hays Lake in the south-central part of the 3a Aphanitic map-area. Stripping by the syndicate had disclosed a During the current mapping, samples were collected quartz vein (the Derraugh vein) striking N60"E and from northeast-trending mineralized shear zones and 3b Porphyritic flows 3f Carbonatized dipping B50N and occupying a shear zone The vein were assayed by the Geoscience Laboratories, On tario Geological Survey. Assays of 0.01 ounce gale was originally described as 14 inches wide and miner Intermediate Metavolcanics alized with pyrite, chalcopyrite, and galena, In 1937 per ton were obtained from a shear zone (No. 13), Jedder Gold Mines Limited carried out diamond drill close to the &NS Lake fault and from a shear zone near the Augasabon River (No, 5). An assay of 0,02 2a Aphanitic ing with discouraging results. No record of the drilling 2b Lapilli tuff , . * - -~ is available. During the period 1970 to 1980, W. Acker ounce gold per ton was obtained from a rusty shear zone, from a fault near Von Lake (No. 34), in the south 2d © PorphyriticfJows " ; . i--;- of Schreiber. Ontario, carried out surface exploration 2j Amygdaloidal . ;- ^ work and erected a crusher at the eastern end of the western part of the map-area. An assay of 0.03 ounce gold per ton was obtained from a northeast shear zone 2k Variolitic ; © " ©©-/© vein. Vein material was crushed and shipped for as 2m Tuff © ,- IV:. saying. Examination by the writer showed the vein to (No. 36), in the southwestern part of the Terrace Bay Batholith along the shore of Lake Superior, at Worth be about 500 feet long and 18 inches wide in basalt Mafic Metavolcanics .. M host rock intruded by aplite, pegmatite, and quartz- ington Bay. feldspar porphyry. 1a Aphanitic During 1937 and 1938 Cook Lake Gold Mines Limited Copper 1c Amygdaloidal (No 4), and (No. 17), carried out exploration in three Assay ot a grab sample from a mineralized shear in 1d Amphibole schist, amphibolite, fine- to medium- mineralized areas on their property located in the basalt (No. 10), by Ascot Metals Corporation Limited grained west-central part of the map-area. In one of these in 1954 yielded 1.06 percent copper across 47 feet 1e Pillowed .-. . 1j Porphyritic feldspar areas which could not be relocated by the present from the main Ascot Metals prospect (No. 10), at An 1k Amphibolite-granite migmatite, contact rock field party, a quartz vein 2 to 3 inches wide and 91 feet sell Lake. Assays of 0.6 percent copper, 0.3 ounce long that contained visible gold, galena, chalcopyrite, gold per ton, and nil for nickel were obtained from drill 1m Tuff and pyrite was discovered emplaced in a fault striking core over 10 feet1 . 1p Variolitic NGO/©W and dipping 42"N. A road was built to the 1q Carbonatized showings from Schreiber, camp and plant buildings Copper-Lead-Zinc were erected, and a mining plant installed. An adit NOTES was driven to the vein for 410 feet, and 200 feet of drift Drilling by Zenmac Metal Mines Limited in 1969 on the ing was carried out. A two-compartment vertical shaft former Schreiber Pyramid Gold Mines Limited prop "This is basically a Field Legend and may be changed as a result of sub sequent laboratory investigations. was sunk to 115 feet and a level established 112 feet. erty (No. 21), revealed massive sulphide mineraliza Five hundred feet of drifting was done. Thirty-two tons tion over a 1-foot wide zone assaying 19.2 percent Subdivision of major rock units does not indicate age relations. of bulk samples were shipped to Little Long Lac Mine zinc, and 4.56 percent copper1 . for mill testing, No assays were reported. Work was Drilling for massive-sulphide, stratiform, base-metal discontinued in 1938. In the second area, showings mineralization had been earned out in 1977 by HBOG SYMBOLS called the Johnston-McKenna showings (No. 17), Mining Limited {No 20), at Lamont and at Hollinger were discovered which consisted of several lenticular Lake, both in the southwestern part of the map-area. Glacial striae Lineament or fault quartz veins. The largest was 2.5 feet wide occurring Assay values from the drill core for copper, lead, and in a fault striking N650E and dipping 45"N. It was zinc did not exceed 0.1 percent in either area". Small bedrock out Lineament trenched for a distance of 100 feet. An adit was driven crop for 250 feet onto the vein and 120 feet of drifting car Copper-Molybdenum Jointing; (horizontal, ried out A bulk sample of 5 tons from the vein, taken Area of bedrock out inclined, vertical) underground, assayed O 81 ounce gold per ton. Work Mineralization of this lype is spatially associated with crop was discontinued on these showings in 1937. In the the Terrace Bay Batholith, and the known occurrences Anticline, syncline, are located primarily in the southwestern part of the third area, the McKenna-McCann showings (No. 4), " ~ Bedding, top un with plunge were discovered Stripping and trenching were car pluton Assay results from an unknown kind of sam known; (inclined, ried out on the parallel quartz veins comprising the pling by Nor-Acme Gold Mines Limited in 1965 from vertical) Drillhole; (vertical, in showings and occurring 15 feet apart on a strike of the Pitkanen occurrence (No. 29), that consists of a clined) N50"W. The dip of the veins was 65 to 70DSW. They network ol mineralized quartz veins Vz to 4 inches wide Lava flow; top (ar varied from 12~0 lo 270 feet in length and from 10 to 24 in a quartz-feldspar porphyry facies of hornblende row) from pillows Vein, vein network, inches in width, Mineralization consisted of gold, py granite and located within a quarter mile ot the bathol shape and packing Width in inches, rite, chalcopyrite, and galena. In 1972 to 1975 Walter ith contact, gave 3.26 percent molybdenum and O 01 Width in feet. Acker of Schreiber dewatered and repaired the shaft percent copper1 . The best assay from diamond-drill Schistosity; (horizon on the property and carried out surface exploration. core from the occurrence in 1969 by Univex Explora tal, inclined, vertical) Shaft; depth in feet On another part of the same property (No. 17), at an tion and Development Corporation Limited, was 0.2 undisclosed location, Mina-Nova Mines Limited in percent molybdenum and 0,2 percent copper over 2 Gneissosity; (hori Magnetic attraction 1959 described several quartz veins striking north or feet in monzonite©. zontal, inclined, ver no rit i wesi-southeast. One uf these veins, Ihe main tical) Foiiation; (horizontal, vein, was 200 feet long and 6 to 18 inches wide. It has Nickel-Copper inclined, vertical) a North-South strike and a dip of 350E. It was mineral Banding; (horizontal, ized with native gold, chalcopyrite, and pyrite. No assays for nickel are available from the pyrite-pyr- ,© ^ inclined, vertical) Overturned pillows rhotite- magnetite body at the Downey occurrence i la^x In 1937 surface exploration led to the discovery of the (No. 28), although the showing was pitted. 0 Little Bear deposit (No. 19), a quartz vein originally de a\ 1d ©^0^ Geological bounda Trail; portage (cur ry, observed rent) scribed as 6 inches wide and 200 feet long and strik Silver-Copper ing N500W with a dip of 75QSW, located ©/4 mile south- west of Little Bruin Lake The vein occurs in malic © During the current survey a mineralized portion of a Geological bounda Trait; portage (old) metavolcanics and is mineralized with gold, sphaler thirty foot wide diabase dike trending east-northeast ry, position inter ite, chalcopyrite,©pyrite, and galena. In 1950 two holes was located at Worthington Bay (No. 37), in Lake Su preted were diamond drilled for a total of 88 feet on the prop perior in the southwestern corner of the map-area. The erty by J.E. Halonen In the period 1970 to 1972 sur mineralization consisted of massive pyrite and chalco face exploration work was carried out on the vein by pyrite. There is no record or evidence of previous ex Hoys R.W. Pitkanen. Examination by the writer showed the ploration and the deposit thus constitutes a new oc METAL AND vein to be 5 feet wide and 150 feet long on which an 8 currence. A grab sample was taken for analysis and MINERAL by 5-foot shaft had been put down. Chalcopyrite, gave values of 2.76 ounses silver per ton and 1,09 S J? sphalerite, and pyrite occur as stringers, disseminated percent copper on analysis by the Geoscience Labo ABBREVIATIONS specks, and in the massive state. In 1973 Royex Min ratories, Ontario Geological Survey. ing Limited and Sturgex Mines Limited held options on ra 3426 Ag...... Silver Mo...... Molybdenum the property from the owner, J.E. Halonen. RECOMMENDATIONS FOR FUTURE TB3354 *. l Au...... Gold Pb...... Lead In 1939 Sylvanite Gold Mines Limited sampled a six EXPLORATION Cu...,...... Copper po ...... Pyrrhotite ty-foot long adit which had been driven southward into a hill at the Downey occurrence (No. 28), located in Gold Mineralization cv...... ,...... Calcite vein py...... ,...... Pyrite the southwestern part of the map-area. Mineralization fl ...... Fluorite qv...... Quartz vein The gold deposits of the area occur in two environ consisted of massive pyrite, pyrrhotite, and magnetite. gf...... Graphite Zn...... Zinc The assay results for gold were discouraging and no ments: in quartz veins occupying mineralized shears further work was done. within the metavolcanics that trend northeasterly and mag ...... ,...... Magnetite northwesterly, and at the contact zone of the Terrace Bay Batholith, also within mafic metavolcanics. Explor Copper ; ation tor gold should thus be concentrated to the northeasterly two-thirds of the map-area which is un LIST OF In 1921 surface exploration work by unknown con derlain by metavolcanics and along the contact zone PROPERTIES, cerns led to the discovery of copper occurrences at of the Terrace Bay Batholith. The area underlain by Ansell Lake (No. 10), in the northwestern part of the metavotcanics is characterized by numerous linea DEPOSITS, AND map-area. A geological survey was carried out for the ments many of which follow northwesterly and north EXPLORED AREAS property owners, East Sullivan Mines Limited, in 1950, easterly directions, and which are clearly visible on by which time eight occurrences of mineralization had aerial photographs. Exploration work should be di been discovered. The most important showing, the rected to determining which of these lineaments are 1. Acker, Walter 20. HBOG Mining Limited (1977) No. 7. was a three-foot wide shear containing quartz shears, while stream geochemical surveys should be 2. Acker, Walter (Jedder pro 21. Kenecho Mines Limited veins in basalt. The strike of the shearing was N80"E used to isolate favourably mineralized zones, as spect, Derraugh vein) (Schreiber Pyramid Mine) and the dip 750SE. Mineralization consisted of disse streams usually follow the lineaments. 3. Acker, Walter (Gold Range 22. Kimberly-Clark Pulp and Pa minated and©Stringer chalcopyrite, pyrite, and pyrrho Mine) tite. In 1954 Ascot Metals Corporation drilled three dia per Company Limited mond-drill holes totalling about 1000 feet on this Copper-Lead-Zinc Mineralization 4. Acker, Walter (McKenna- 23. Lormac Exploration Limited McCann prospect) showing. Current mapping has shown that narrow horizons of Mo,Cu.| 24. MacDonald, J.A. interflow sediments comprising chert, wacke, and g.p0 © bv ^ - 5. Aguasabon River No. 1 occur 25. MacEchern, Donald Trenches rence Copper-Lead-Zinc ironstone occur within the metavolcanic sequence. 26. Mccuaig, A.B. 6. Aguasabon River No. 2 occur Drilling by Zenmac Metal Mines Limited has outlined 27. Noble, T. (Blanchford occur Exploration for copper-lead-zinc mineralization was rence massive-sulphide, base-metal mineralization associ rence) done in 1969 by Zenmac Metal Mines Limited when 5 ated with such rocks It is recommended that detailed 7. Archibald, C.W, (Otisse Mine) holes totalling 790 feet were diamond drilled on the 28. Noble, T. (Downey occur mapping be carried out in the metavolcanic areas to 8. Archibald, John original Schreiber Pyramid Gold Mines Limited prop outline these interflow sediment horizons, and that rence) Q.Armstrong, T.C. erty (No. 21), in the west-central part of the map-area. concurrent base-metal geochemical surveys be con 29. Noble, T. (Pitkanen occur In 1977 HBOG Mining Limited (No. 20), diamond ducted to outline mineralized horizons. 10. Ascot Metals prospect rence) drilled a 221-foot hole at Lamont Lake and a 347-foot 11. Downey, C.S. 30. Rolac Mines Limited hole at Hollinger Lake, both in the southwestern part of 12. Dunbar, J.A. the map-area, in order (o test electromagnetic con Copper-Molybdenum Mineralization 31.Spicer, LG. 13. Ellis Lake occurrence ductors in similar metasediments. Copper-molybdenum mineralization is associated with 32. Univex Exploration S Devel quartz veins occurring m the granitic rocks of the Ter 14. Penning Development Cor opment East occurrence Copper-Molybdenum ace Bay Batholith, underlying the southeastern thiro poration 33. Univex Exploration ft Devel of the map-area. The western contact zone of the Ter 15. Gale, D.E opment West occurrence Exploration for copper-molybdenum mineralization MINERAL race Bay Batholith appears to be especially favoura Terrace LOCATION 16. Graham, E.M, 34. Von Lake occurrence was begun in 1965 by Nor-Acme Gold Mines Limited ble, and would represent the hood region of the ba- who examined the Pitkanen occurrence ^No. 29), a \ NO. 2 17. Greenfield, H. (Johnston- 35. Western Ontario Mines Lim ©tholith. In addition, copper-molybdenum McKennaMme) ited copper-molybdenum deposit located in the south mineralization also occurs well within the batholith and western part of the map-area. In the same year No- 18. Hacquoil Construction Lim 36. Worthington Bay No 1 occur this suggests that the upper part of the hood is also Taylor^* rence randa Mines diamond drilled 2 holes for 543 feet on preserved. The entire area underlain by the batholith ited (Harkness-Hays Mine) 37. Worthington Bay No. 2 occur the occurrence In 1965 OJA Limited carried out a should therefore be prospected using copper-molyb Old NedS^f 19. Halonen, J.E. magnetometer survey over these and other similar oc denum biogeochemical surveys to isolate favourable rence currences (No. 32 and No, 33), irrthe area which was areas (Wolfe 1976). This method is suggested be followed in 1970 by a copper-molybdenum geochemi cause large areas in the southwestern and northern /-- N^cgJ cal survey and an airborne electromagnetic survey. margins of the pluton are drift covered, streams are "A \ Vi SOURCES OF INFORMATION Several weak anomalies were obtained. During the not common, and soil cover is not extensive. In these period 1969 to 1974 Thunder Bay Drilling sank 5 dia * circumstances biogeochemical prospecting is partic Base map derived from Forest Resources Inventory maps, Lands and mond-drill holes for 1616 feet on the Pitkanen occur ularly useful as the entire area covered by the batholith rence. Waters Group, Ontario Ministry of Natural Resources. can be sampled. Geology is not tied to surveyed lines. © - © Nickel-Copper *©# Resident Geologist©s Files, Ontario Ministry of Natural Resources, KVU. ©Information from Resident Geologist©s Files, Ontario Ministry land Lake, Thunder Bay. About 1948, Ironlake Exploration Limited carried out a of Natural Resources, Thunder Bay. dip-needle survey over an area containing a massive Schreiber-Duck Lake Area; Ontario Department of Mines Map No. 30a, pyrite-pyrrhotite-magnetite body, the Downey occur by P.E. Hopkins, 1921, scale 1:63 360 or 1 inch to 1 mile. rence (No. 28), located in the southwestern part of the Schreiber Area; Ontario Department of Mines Map No. 47j, by G.A Harc map area. Pits had previously been put down on the . ourt and M.W. Bartley, 1938, scale 1:31 680 or 1 inch to Vfe mile. deposit but no nickel or copper assays were record ed. In 1965 Tri-J Mineral Surveys Limited carried out a Thunder Bay, Surficial Geology, Ontario Department of Lands and For vertical magnetic intensity survey over the occur REFERENCES ests Map No. S265, by S.C. Zoltai, 1965. rence. Schreiber Sheet: Ontario Department of Mines Preliminary Map P. 360, Bartley. M.W by E.G. Pye, 1966, scale 1:126 720 or 1 inch to 2 miles. GENERAL GEOLOGY 1938 The Northeastern Part of the Schreiber Area; Ontario Department of Mines, Val 47, pt. 9, p.29-45. Accompa Nipigon-Schreiber Sheet; Ontario Department of Mines Map 2232. by Previous geological mapping was carried out in the nied by Map 47j; scale 1 inch to Vi mile (published M.W. Carter. W.H. Mcilwaine and P.A. Wisbey, 1973, scale 1:253 440 or Schreiber area by Harcourt (1938) and Bartley (1938), 1939) 1 inch to 4 miles. and by Carter (198la,b). The map-area is underlain by Carter, M W. Northern Ontario Engineering Geology Terrain Study, Schreiber, Data Early and Middle to Late Precambrian rocks mantled 1981 a: Precambrian Geology ot the Schreiber Area, West Base Map. Ontario Geological Survey Map 5092, by J.F. Gartner. 1980, by Pleistocene and Recent deposits Part, Thunder Bay District; Ontario Geological Survey scale 1:100000. Preliminary Map P. 2390, Geological Series, scale 1:15 Early Precambrian rocks comprise a metavolcanic- Magnetic declination was approximately 1*49©W in 1966. metasedimentary sequence, metagabbroic intrusions, ; 840or 11nch to tt mile. Geology 1979. granitic-syenitic plutons, and diabase and lampro 1981 b: Precambrian Geology of the Schreiber Area, East phyre dikes The metavolcanics consist predominantly Part, Thunder Bay District; Ontario Geological Survey CREDITS v of mafic rocks, black to very dark green in colour, that Preliminary Map P. 2391, Geological Series, scate 1:15 are ptWowed, amygdaloidal, and variolitic in texture. WO or 1 inch to ^a mite Geotogy t979. Geology by M.W. Caner and assistants, 1980. Because of their colour, they are believed by the au Fahring, W.F , Gaucher, E.M., and Larochelle, A. thor to be iron-rich tholeiites. An ultramafic unit occur 1965. Paleomagnetism of diabase dikes ol the Canadian Keith ring at Big Bruin Lake, in the west-central part of the Shield. Canadian Journal of Earth Sciences. Vol. 2, p. Every possible effort has been made to ensure the accuracy of the infor map-area, may be an ultramafic flow. The occurrence 278-298. Rock mation presented on this map; however, the Ontario Ministry of Natural of pillowed structures indicates that the mafic flows Gartner. J.F. Resources does not assume any liability for errors that may occur. Users are subaqueous and the amygdaloidal texture sug 1979; Schreiber Area (NTS 42 D/WW), District of Thunder may wish to verify critical information; sources include both the refer gests a shallow-water depositional environment Inter Bay: Ontario Geological Survey, Northern Ontario Engi ences listed here, and information on file at the Resident or Regional Ge mediate metavolcanics are less voluminous and felsic neering Geology Terrain Study 59. 15p. Accompanied ologist©s office and the Mining Recorder©s office nearest the map-area. metavolcanics are rare. Pyroclastic rocks are uncom by Map 5092, scale 1:100 000. mon, and coarse pyroclastics are absent Metasedi Harcourt, G.A. Issued 1981 ments interfered with volcanic rocks comprise nar 1938 The Southwestern Part of the Schreiber Area; Ontario row units of chert, wacke, and magnetite ironstone Department of Mines, Vol. 47, pt. 9, p. 1-2B. Accompa These supracrustal rocks have been metamorphosed nied by Map No. 47j, scale 1 inch to Vz mile (published Information from this publication may be quoted if credit is given. It it to greenschist and amphibolite-ran k regional meta 1939). superior recommended that reference be made in the following form: morphism, but the colour ot the rocks has not been ap Wolfe, W.J Carter, M W. preciably changed A general mineral foliation is pres 1976: Geochemical and Biogeochemical Exploration of Mol ybdenum-Copper Mineralization at Setting Net Lake, Les Refits Ecrits 1961 Precambrian Geology of the Terrace Bay Area, West Sheet, Thun ent. Metagabbroic rocks varying from coarse- to me der Bay District; Ontario Geological Survey Preliminary Map P. dium-grained .and completely metamorphosed to District of Kenora (Patricia Portion); Ontario Division of Mines, GR 156, 28p. 2417, Geological Series, Scale 1:15 840 or 1 inch to V* mite. Geol amphibolites, occur throughout the map-area intrud ogy 1980, - , . ing the supracrustal rocks In one case fresh, unmeta- 48045©00"