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: Milne, V.G. 1972. Geology of the Kukatush-Sewell Lake Area, District of Sudbury; Ontario Division of Mines, Geological Report 97, 116p. 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 DIVISION OF MINES GEOLOGICAL REPORT 97 GEOLOGY OF THE KUKATUSH-SEWELL LAKE AREA DISTRICT OF SUDBURY By V. G. Milne 1972 Ministry of Natural Resources ONTARIO DIVISION OF MINES HONOURABLE LEO BERNIER, Minister of Natural Resources W. Q. MACNEE, Deputy Minister ot Natural Resources Division of Mines E.G.Pye, Director, Geological Branch GEOLOGY OF THE KUKATUSH-SEWELL LAKE AREA DISTRICT OF SUDBURY By V. G. Milne Geological Report 97 TORONTO 1972 ©ODM 1972 Publications of the Ontario Division of Mines and price list are obtainable through the Publications Office, Ministry of Natural Resources 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 Division of Mines. It is recommended that reference to this report be made in the following form. Milne, V. G. 1972. Geology of the Kukatush-Sewell Lake area, District of Sudbury; Ontario Div. Mines, GR97, 116p. Accompanied by Maps 2230, 2231, scale 1 inch to Ya mile. l,000-674~1971c CONTENTS PAGE Abstract vii Introduction 1 Prospecting and Mining Activity 2 Present Geological Survey 3 Acknowledgments 3 Previous Geological Work 4 Topography 4 Natural Resources 5 General Geology 5 Table of Lithologic Units ° Archean ' Mafic to Intermediate Metavolcanics ' Intermediate to Felsic Metavolcanics 9 Metasediments |3 Detrital Metasediments 13 Iron Formation 16 Radio Hill Iron Formation 1" Nat River Iron Formation 23 Early Mafic Intrusive Rocks 26 Ultramafic Intrusive Rocks 28 Primary Structures 30 Secondary Structures 34 Contact Relationships 37 Metamorphism of the Ultramafic Intrusive Rocks 41 Summary 42 Early Felsic Intrusive Rocks 43 Biotite Trondhjemite Gneiss 43 Porphyritic Intrusions 45 Late Felsic Intrusive Rocks 47 Proterozoic • 50 Late Mafic Intrusive Rocks 50 Diabase 50 Biotite Amphibolite 51 Cenozoic 52 Pleistocene and Recent 52 Regional Metamorphism 52 Structural Geology 53 Folding 53 Secondary Cleavage, Kink Bands 55 Jointing 55 Faulting 56 North-Northwest Faults 56 North-Northeast Faults 57 West-Northwest Faults 57 East-Northeast Faults : 58 Economic Geology 60 Asbestos 60 Exploration Considerations 62 Copper •- 63 iti PAGE Gold 63 Iron 64 Industrial Minerals 64 Nickel 65 Description of Properties, Occurrences and Exploration Areas 66 Bragagnola (Bromley) Property (9) 66 Brewis and White [1946] 66 Canadian Johns-Manville Company Limited (1, 3, 4, 10, 11, 15) 67 Reeves Mine Property (1, 10) 67 Reeves Mine 68 General Structure 71 East Zone • 71 West Zone 71 East and West Zones 72 "75" Zone 73 Jehann Fibre Zone 73 Nat River Fibre Zone 73 Dupont Fibre Zone 73 Horwood Lake Claim Group [1957] 74 Montgomery Lake Property (11) 74 Nat River and Burtho Claim Groups [1956] 75 East Nat River Claim Group [1965] 75 Radio Hill Claim Group [1957] 75 Sewell Township Claim Groups 75 Crossover Lake Claim Group [1957] 76 North Sewell Claim Group [1957] 76 Sewell Lake Claim Group [1957] 76 Weston Lake Claim Group [1957] 76 Lap Lake Claim Group [1965] 76 West-Central Sewell Claim Group [1965] 77 North Weston Lake Property (3) 77 South Crossover Lake Property (4) 77 Kenogaming Township Claim Groups 77 Nest Lake-Benbow Lake Claims Groups [1957] 78 Crawford River Claim Group [1959] 78 South Hanrahan Lake-Crawford Lake Property (15) 79 Consolidated Thor Mines Limited [1956] 79 Consolidated Tungsten Mining Corporation of Canada Limited [1956] 80 Delmico Mines Limited [1965] 80 Dunvegan Mines Limited [1957] 80 Hoodoo Lake Mines Limited 80 Gold Mineralization 80 Nickel Mineralization 82 Asbestos Occurrences 82 Exploration History 83 Falconbridge Nickel Mines Limited (12) 84 Cryderman or Ravena Property 84 Falconbridge Nickel Mines Limited (16) 86 Norduna Property 86 Fallmac Nickel Mines Limited [1956] 87 Fawcett Property [1947] 88 Horwood Mining Limited [1965] 88 International Nickel Company of Canada Limited, The, [1964-1965] 89 Jade Oil and Gas Company Incorporated [1965] 89 Jonsmith Mines Limited [1957] 90 Sewell Township Claim Group 90 Jonsmith Mines Limited (17) 90 Hoodoo Claim Group 90 Kalbrook Mining Company Limited [1946] 91 Keithgold Mines Limited [1947] 91 Knight, J. (5) 92 Kukatush Mining Corporation (Ontario) Limited (13) 92 History 92 Development Work Since 1958 93 Geology 94 Radio Hill Formation 96 iv PAGE Structural Geology ; 96 Iron Deposit Character and Dimensions 97 Types of Ore 97 Estimate of Ore Reserves 98 E Type Ore 99 F Type Ore 99 Distribution of Ore 1°° Grading of Ore 100 Metallurgy 1°° Chemical Analyses of Flotation Concentrate 100 Nat River Iron Formation Grades and Estimated Dimensions 101 Prospecting Suggestions 101 Lamport-Lumbers Property (2, 6) 102 Lapierre, L. [1964] 103 Little Long Lac Gold Mines Limited, The, [1947] 103 Mclntyre Porcupine Mines Limited and Castle-Tretheway Mines Limited [1946-1947] 104 McRae, J.A., [1947] 104 Mining Corporation of Canada (1964) Limited (7) 105 Nib Yellowknife Mines Limited [1947] 106 Pen-More Prospecting Syndicate [1947] 106 Pen Star Prospecting Syndicate [1947] 106 Penwood Gold Mines Limited [1950] 107 Purdy Mica Mines Limited [1947] 107 Radio Hill Mines Company Limited (8, 14, 18) 107 Texas Gulf Sulphur Company [I960] 109 Transhorwood Mines Limited [1950] 109 Selected References HO Index H3 Tables 6 1-Table of Lithologic Units ; 2—Generalized succession in Radio Hill iron formation 19 3-Modal analyses of Early and Late Felsic Intrusive Rocks 44 4—Assessment work data v 61 5—Assays and analyses of samples from Dunvegan Mines Ltd. property 81 6-Summary of ore reserves for Radio Hill iron formation 99 7—Summary of ore reserves for Radio Hill iron formation 100 8-Chemical analyses of flotation concentrate 101 Figures 1-Key map showing location of the Kukatush-Sewell Lake