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Geology of the Heron Bay Area; District of Thunder ISSN 0704-2582 ISBN 0-7743-6950-7 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. 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[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 Geological Survey Report 218 Geology of the Heron Bay Area District of Thunder Bay by T.L. Muir 1982 Ministry of Natural Resources Ontario Ontario Geological Survey Report 218 Geology of the Heron Bay Area District of Thunder Bay by T.L. Muir 1982 Hon. Alan W. Pope Ministry of Minister Natural W.T. Foster Resources Deputy Minister Ontario ®OMNR 1982 ISSN 0704-2582 Printed in Canada ISBN 0-7743-6950-7 Publications of the Ontario Ministry of Natural Resources are available from the following sources. Orders for publications should be accompanied by cheque or money order pay­ able to the Treasurer of Ontario. Reports, maps, and price lists (personal shopping or mail order): Public Service Centre, Ministry of Natural Resources Room 1640, Whitney Block, Queen's Park Toronto, Ontario M7A 1E3 Reports only (personal shopping): Ontario Government Bookstore Main Floor, 880 Bay Street Toronto, Ontario Reports and maps (mail order or telephone orders): Publications Services Section, Ministry of Government Services 5th Floor, 880 Bay Street Toronto, Ontario M7A1N8 Telephone (local calls), 965-6015 Toll-free long distance, 1-800-268-7540 Toll-free from area code 807,0-ZENITH-67200 Every possible effort is made to ensure the accuracy of the information contained in this re­ port, but the Ministry of Natural Resources does not assume any liability for errors that may occur. Source references are included in the report and users may wish to verify critical in­ formation. Parts of this publication may be quoted if credit is given. It is recommended that reference to this report be made in the following form: Muir, T.L. 1982: Geology of the Heron Bay Area, District of Thunder Bay; Ontario Geological Survey Report 218, 89p. Accompanied by Map 2439, scale 1:31 680. 1000-81-Thorn ii CONTENTS Abstract vii Introduction 1 Location 1 Access 1 Physiography 2 Previous Work 2 Present Field Work 3 Acknowledgments 3 General Geology 4 Table of Lithologic Units for the Heron Bay Area 5 Early Precambnan (Archean) 6 Metavolcanics 6 Mafic Metavolcanics 6 Pulpwood-Playter Harbours Sequence 6 Heron Bay Sequence 8 Intermediate to Felsic Metavolcanics 12 Metasediments 13 Clastic Metasediments 18 Chemical Metasediments 20 Metamorphosed Mafic Intrusive Rocks 20 Gabbro and Diorite 20 Schistose Dikes 21 Metamorphosed Ultramafic Intrusive Rocks 22 Intermediate to Felsic Intrusive Rocks 24 Pukaskwa Gneissic Complex 25 Gowan Lake Pluton 27 Heron Bay Pluton 28 Late Felsic Dikes and Sills 29 Porphyritic Dikes 29 Non-Porphyritic Dikes 31 Middle to Late Precambrian 32 Mafic Intrusive Rocks 32 Diabase Dike Emplacement 32 Late Precambrian 36 Alkalic Intrusive Rocks 36 Port Coldwell Alkalic Complex 36 Gabbro 37 Monzonite 38 Hornblende Quartz Syenite Pegmatite 39 Alkalic and Related Dikes 39 Gabbro, Diabase 41 Lamprophyres 43 Porphyritic Gabbro 44 Porphyritic Syenite 45 Carbonatite Dikes 46 Intrusion Breccia 46 Cenozoic 46 Quaternary 4^ Pleistocene and Recent 4§ Petrochemistry 4? Metamorphism 59 Structural Geology 60 Lineaments 61 Faults 61 Folds 61 iii Economic Geology Gold, Silver Copper Molybdenum Description of Properties and Deposits Anaconda American Brass Limited [1968] (1) Anaconda Sulphide Occurrence (2) Cosgrove, J.T [1957] (3) Downey, C.S. (4) Dunlop, W.B. (5) Galex Mines Limited [1972] (Citadel Mines Ltd [1969]) (6) Great Basin Metal Mines Limited [1966] (7) Keevil Mining Group Limited (Barrett option) [1965] (8) Kinasco Exploration and Mining Limited [1956] (9) McCuaig, K.T. (10) Mentor Exploration and Development Company Limited [1956] (11) Michano, D. (12) Norgold Mines Limited [1956] (13) Provincial Mining and Development Company Limited [1965] (14) Rockwin Mines Limited [1956] (15) Schiralli, R.A. (16) History General Geology Main Prospect Smith, R.J. (17) Stenlund E. (18) Stenlund, L. (19) Stenlund, RE (20) Stenlund, V. (21) Zulapa Mining Corporation Limited [1956] (22) Recommendations for Future Mineral Exploration Appendix—Glassy Dikes and Radiometric Dates References Index TABLES 1—Table of Lithologic Units 2—Chemical Analyses of Mafic Metavolcanics 3—Chemical Analyses of Intermediate to Felsic Metavolcanics 4—Chemical Analyses of Clastic Metasediments 5—Chemical Analyses of Mafic Intrusive Rocks 6—Chemical Analyses of Ultramafic Intrusive Rocks 7—Chemical Analyses and Visual Modal Estimates of Pukaskwa Gneissic Complex Samples 8—Visual Modal Estimates of Gowan Lake Pluton Samples 9—Visual Modal Estimates of Heron Bay Pluton Samples 10—Chemical Analyses of Late Felsic Dikes 11—Comparison of Subalkalic and Alkalic Diabase Dikes 12—Chemical Analyses of Subalkalic Diabase Dikes 13—Chemical Analyses of Samples from Port Coldwell Complex 14—Cross-Cutting Relationships Between Eight Dikes 15—Chemical Analyses of Alkalic and Related Dikes 16—Classification of Chemically Analysed Specimens 17—Trace Element Analyses of Whole Rock Samples 18—Assays of Intercalated Sedimentary Rocks and Tuffs from the Pulpwood Harbour Area 19—List of Properties and Deposits 20—Chemical Analyses of Glass-Bearing Dikes 21 —Classification of Glass-Bearing Dikes iv FIGURES 1—Key map showing location of the Heron Bay area v 2—Hypothetical dike configurations to demonstrate difficulty in interpreting observed outcrops 35 3—Location of samples taken for chemical analysis Chart A 4—AFM plot of chemically analysed samples from the Heron Bay area 48 5—Cation plot of chemically analysed samples from the Heron Bay area 50 6—Ne-OI-Q plot of chemically analysed samples from the Heron Bay area 52 7—Alkalies vs silica plot of chemically analysed samples from the Heron Bay area 54 8—Locations of samples taken for assay from the Pulpwood Harbour area 65 9—Sketch map showing exploration activity in the Heron Bay area 70 10—Plan of diamond drilling and geology of the Schiralli property 75 11 —Ne-OI-Q plot of chemically analysed samples of glassy dikes from
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