THESE TERMS GOVERN YOUR USE OF THIS DOCUMENT Your use of this Ontario Geological Survey document (the “Content”) is governed by the terms set out on this page (“Terms of Use”). By downloading this Content, you (the “User”) have accepted, and have agreed to be bound by, the Terms of Use. Content: This Content is offered by the Province of Ontario’s Ministry of Northern Development and Mines (MNDM) as a public service, on an “as-is” basis. Recommendations and statements of opinion expressed in the Content are those of the author or authors and are not to be construed as statement of government policy. You are solely responsible for your use of the Content. You should not rely on the Content for legal advice nor as authoritative in your particular circumstances. Users should verify the accuracy and applicability of any Content before acting on it. MNDM does not guarantee, or make any warranty express or implied, that the Content is current, accurate, complete or reliable. MNDM is not responsible for any damage however caused, which results, directly or indirectly, from your use of the Content. MNDM assumes no legal liability or responsibility for the Content whatsoever. Links to Other Web Sites: This Content may contain links, to Web sites that are not operated by MNDM. Linked Web sites may not be available in French. MNDM neither endorses nor assumes any responsibility for the safety, accuracy or availability of linked Web sites or the information contained on them. The linked Web sites, their operation and content are the responsibility of the person or entity for which they were created or maintained (the “Owner”). Both your use of a linked Web site, and your right to use or reproduce information or materials from a linked Web site, are subject to the terms of use governing that particular Web site. Any comments or inquiries regarding a linked Web site must be directed to its Owner. Copyright: Canadian and international intellectual property laws protect the Content. Unless otherwise indicated, copyright is held by the Queen’s Printer for Ontario. It is recommended that reference to the Content be made in the following form: Leahy,E.H., 1971. Geology of the Night Hawk Lake area, District of Cochrane; Ontario Dept. of Mines and Northern Affairs, GR96, 74p. Use and Reproduction of Content: The Content may be used and reproduced only in accordance with applicable intellectual property laws. Non-commercial use of unsubstantial excerpts of the Content is permitted provided that appropriate credit is given and Crown copyright is acknowledged. Any substantial reproduction of the Content or any commercial use of all or part of the Content is prohibited without the prior written permission of MNDM. Substantial reproduction includes the reproduction of any illustration or figure, such as, but not limited to graphs, charts and maps. Commercial use includes commercial distribution of the Content, the reproduction of multiple copies of the Content for any purpose whether or not commercial, use of the Content in commercial publications, and the creation of value-added products using the Content. Contact: FOR FURTHER PLEASE CONTACT: BY TELEPHONE: BY E-MAIL: INFORMATION ON The Reproduction of MNDM Publication Local: (705) 670-5691 Content Services Toll Free: 1-888-415-9845, ext. [email protected] 5691 (inside Canada, United States) The Purchase of MNDM Publication Local: (705) 670-5691 MNDM Publications Sales Toll Free: 1-888-415-9845, ext. [email protected] 5691 (inside Canada, United States) Crown Copyright Queen’s Printer Local: (416) 326-2678 Toll Free: 1-800-668-9938 [email protected] (inside Canada, United States) ONTARIO DEPARTMENT OF MINES AND NORTHERN AFFAIRS Geological Report 96 Geology of the Night Hawk Lake Area District of Cochrane By E. J. LEAHY 1971 ONTARIO DEPARTMENT OF MINES AND NORTHERN AFFAIRS HONOURABLE LEO BERNIER, Minister D. P. DOUGLASS, Deputy Minister J. E. THOMSON, Director, Geological Branch Geology of the Night Hawk Lake Area District of Cochrane By E. J. Leahy Geological Report 96 TORONTO 1971 Publications of the Ontario Department of Mines and Northern Affairs and price list are obtainable through the Publications Office, Ontario Department of Mines and Northern Affairs Parliament Buildings, Queen's Park, Toronto, Ontario and The Ontario Government Bookstore 880 Bay Street, Toronto, Ontario. Orders for publications should be accompanied by cheque, or money order, payable to Treasurer of Ontario. Parts of this publication may be quoted if credit is given to the Ontario Department of Mines and Northern Affairs. It is recommended that reference to *his report be made in the following form: Leahy, E. H. 1971: Geology of the Night Hawk Lake area, District of Cochrane; Ontario Dept. of Mines and Northern Affairs, GR96, 74p. Accompanied by Map 2222, scale 1 inch to Vz mile. l,000-651-1970rp CONTENTS PAGE Abstract vn Introduction j Historical Background * Previous Geological Work — • 2 Present Geological Survey 4 Acknowledgments 4 Means of Access 4 Topography j* Resources of Area " General Geology ® Table of Lithologic Units ' Some Remarks on Stratigraphy 8 Volcanic Rocks | Mafic Intrusive Rocks ° Archean 9 Mafic to Intermediate Metavolcanics 9 Southwestern Carman Township 9 East and Central Night Hawk Lake Area 10 Northwestern Cody Township 11 Iron Formation 11 Intermediate to Felsic Metavolcanics 12 Older Metasediments and Tuffaceous Metasediments 13 Mafic and Ultramafic Intrusive Rocks 14 Younger Sedimentary Rocks 16 Felsic Intrusive Rocks 1® Extremely Altered Rocks and Carbonatized Rocks 18 Proterozoic 19 Mafic Intrusive Rocks 19 Matachewan-Type (?) 19 Younger Mafic Intrusive Rocks 21 Keweenawan-Type (?) 21 Cenozoic 22 Pleistocene 22 Pleistocene History 27 Economic Considerations 27 Structural Geology 31 Folding 31 Faulting 31 Unoonf ormity 34 Economic Geology 34 Description of Properties 36 Anvil Porcupine Gold Mines Limited [1947] (1) 36 Armonit Gold Mines Limited [circa 1942] (68) 36 Auconda Porcupine Gold Mines Limited [1945-1946] (28) 37 Bertram Porcupine Mines Limited (2) 37 Black Hawk Porcupine Mines Limited [1945] (3) 37 Black Hawk Porcupine Mines Limited [1946] (29) 37 Broulan Reef Mines Limited (4, 30) 38 Canadian Superior Exploration Limited (46) 38 Carshaw Porcupine Gold Mines Limited (47) 39 Clemens, J.F., Estate [circa 1945] (31) 39 Cocallen Porcupine Gold Mines Limited [1944] (5) 39 Desaulnier, C. (6) 40 Dominion Gulf Company [1951] and Mespi Mines Limited [1966] (48) 40 Edgewater Porcupine Gold Mines Limited [1945-1946] (7, 49) 40 Falconbridge Nickel Mines Limited (8) 41 Forsell, Mrs. B. (9) 41 Francis, A.B. (10, 32) 41 Goldhawk, Lakefield, Gold Island 41 Gagne, A. (11) 42 Gallagher Estate (50) 43 Gord, L. (51) 43 iii PAGE Granton Mining Syndicate (52) 43 Hill, Len (12) 43 Hollinger Consolidated Gold Mines Limited [1959-1960] (33) 44 Hydra Explorations Limited (13, 34) 44 Porcupine Peninsular Mine 44 International Nickel Company of Canada Limited, The [1966] (14) 46 Kensull Gold Mines Limited [1946] (53) 47 Kimasca Porcupine Gold Mines Limited [1946] (69) 47 Lang, B.W. (35) 47 Lang, F.D. (36) 47 LaSalle, Rev. R. (54) 48 Markay Mining Corporation Limited (70) 48 McCoy Gold Mines Limited [1946] (37) 49 Miller, W.H. (15) 49 Minedel Mines Limited (38) 49 Mining Corporation of Canada Limited, The [1944] (16) 50 Minithorn, Dr. H.L., Estate (55) 50 Carman Bay Group 50 Minthorn, Dr. H.L., Estate (56) 50 Carman-Langmuir Group 50 Moran, A.J. (39) 51 Muir Porcupine Gold Mines Limited [1937] (71) 51 Mulliette, Morley (57) 51 Noranda Exploration Company (58) 52 North, Miss M. (59) 52 Quirk Claims 52 Payette, Mrs. J. (60) 52 Pecore, J.J. (61) 53 Phelps Dodge Corporation of Canada Liniited [1965] (62, 72) 53 Porcupine MoNabb and Brisson Prospects [1938] (40) 53 Porcupine Paymaster Limited (17) 54 Ray, Gladstone (41) 55 Redstone Porcupine Gold Mines Limited [1945] (18) 55 Rio Algom Mines Limited (19) 55 Frederick House River Claims 55 Rio Algom Mines Limited (20) 55 North Peninsula Claims 55 Rio Algom Mines Limited [1967] (42) 56 Pardee Amalgamated Group 56 Robb Jr., J.M. (63) 58 Roma Lake Gold Mines Limited (21) 58 Ronnoco Gold Mines Limited (22, 43) 58 Shanwell Porcupine Mines Limited [1940] (23) 59 Tavane Explorations Limited (64) 60 Thomas Gold Mining Company Limited [1923] (73) 60 Trio Porcupine Mines Limited [1937] (65) 61 Carman Gold Syndicate 61 United Macfie Mines Limited (66) 61 Ventures Claims Limited (67) 62 Wellington, C.J. (24) 62 Whitco Porcupine Mining Syndicate [1944-1945] (25) 62 Wieland, H. (44) 62 Wilwood Gold Mines Limited (26, 45) 62 Young, J.W. [circa 1938-1940] (27) 63 Wineva Gold Mines Limited 63 Some Suggestions for Further Exploration 63 Gold 63 Base Metals 64 Mineralization Associated with Ultramafic Rocks 64 Information for Mineral Collectors 64 Appendix 65 List of Previously Published Photographs, in ODM Reports, Pertaining to the Night Hawk Lake Area 65 Selected References 67 Index 71 iv Table PAGE 1 - Table of Lithologic Units ....7 Figures 1 - Key map showing location of the Night Hawk Lake area vn 2 - Surficial geology 28 3 - Structural geology 30 4-Sketch map showing location of properties 35 Photographs 1 - Shoreline slumping of clay 5 2 - Fragmented metavolcanic, McLeod Island 11 3 - Jointing patterns in ultramafic rook 15 4-Quartz veins in carbonatized volcanic rock 20 5-Spheroidal weathering in diabase 21 6-Glacial striae 23 7-Glacial erratic boulders 23 8-Layered sands, silts, and clays 24 9 - Crumpling of varved clay 25 10 - Lower Sequence and Frederick House Sequence of varved clays, Matheson Township . 26 11 - Lower Sequence and Frederick House Sequence of varved clays, Thomas Township . .26 Geological Map (back pocket) Map 2222 (coloured) - Night Hawk Lake area, Cochrane District. Scale, 1 inch to Vz mile. v ABSTRACT This geological report on the Night Hawk Lake area is the result of mapping of Cody, Macklem, Carman, and Thomas Townships, in the District of Cochrane.