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MCCREA, Minister of Mines THOS. W. GIBSON, Deputy Minister FORTY-FIRST ANNUAL REPORT OF THE ONTARIO DEPARTMENT OF MINES BEING VOL. XLI, PART III, 1932 Geology of the Three Duck Lakes Area, by H. C. Laird - 1-34 Geology of the Swayze Area, by Geo. D. Furse - - 35-53 PRINTED BY ORDER OF THE LEGISLATIVE ASSEMBLY OF ONTARIO TORONTO Printed and Published by Herbert H. Ball, Printer to the King's Most Excellent Majesty 1932 TABLE OF CONTENTS Vol. XLI, Part III GEOLOGY OF THE THREE DUCK LAKES PAGE AREA Description of Properties—Continued PAGE Russell Cryderman 30 Introduction 1 Chester Shannon Syndicate 31 Acknowledgments 2 J. A. Shannon 33 Previous Work 2 C.T.Young 33 Bibliography 3 C. Cote 33 History of Prospecting in the Area ... 3 P.E. Hopkins 34 Topography and Drainage 4 Porcupine Hecla Mines Company . 34 Natural Resources 5 Economic Possibilities of the Area.... 34 Timber 5 Fish and Game 6 GEOLOGY OF THE SWAYZE AREA Water Power 6 Agriculture 6 Introduction 35 Mapping Methods 6 Acknowledgments 35 General Geology 7 Location and Access 36 Keewatin 8 Previous Work 36 Northern Volcanic Belt 8 Bibliography 36 Southern Volcanic Belt 10 Topography and Drainage 37 Timiskaming 11 Natural Resources 38 Conglomerate, Greywacke, Arkose.. 12 Timber 38 Argillite, Sericite Schist, Quartzite, Game and Fish 38 Silt Rock 15 Agriculture 38 Iron Formation 17 General Geology 39 Age of the Ridout Series 17 Keewatin 39 Pre-Algoman (Haileyburian?) 18 Lower Volcanics 39 Algoman 19 Basic Group 39 Older Granite 19 Iron Formation 40 Granite-Diorite Complex 19 Acidic Group 40 Younger Granite 20 Swayze-Ridout Series 40 Dike Rocks 21 Upper Volcanics 43 Matachewan 21 Basic Group 43 Keweenawan 21 Iron Formation 44 Pleistocene and Recent 22 Upper Group 44 Structural Geology 22 Structural Relations 45 Economic Geology 23 Haileyburian (?) 45 Gold Veins 24 Quartz Diabase, Diorite,and Gabbro 45 Iron 25 Algoman 46 Description of Properties 26 Granite 46 F. Lawrence 26 Feldspar Porphyry 47 Beaver-Bethnal Syndicate 27 Keweenawan 47 A. Brennan 27 Olivine Diabase 47 H. J. Brennan 28 Pleistocene and Recent 47 A. Labbe 28 Economic Geology 48 Three Ducks Syndicate 28 Woman River Iron Range 48 J. Laflamme 30 Origin of the Iron Formation 50 R. S. Sheppard 30 Gold 51 J. H. Collins 30 Kenty Gold Mines, Limited 51 James R. Cryderman 30 Other Prospects 53 ILLUSTRATIONS PAGE A freshly constructed beaver dam 6 Lapilli in pillow lava, Schist lake 9 Closely sheared greywacke with occasional granite pebbles, west arm of Schist lake 12 Stretched conglomerate, west arm of Schist lake 13 Characteristic surface of greywacke under the influence of wave action, west arm of Schist lake 13 Conglomerate with an arkose matrix, Benneweiss creek 14 Polished specimen of banded argillite from an outcrop south of Schist lake 15 Polished specimen of silt rock from an outcrop on the Makwa road 16 Banded iron formation showing light bands of chert and dark bands of limonitic material, Cryderman group 17 Main prospect pit, Lawrence claims, Mesomikenda lake 26 The Gosselin camp, Three Ducks Syndicate, Three Duck lakes 28 Prospect pit in schistose greywacke, Cryderman group, Schist lake 31 The main showing, Chester Shannon Syndicate, Clam lake 32 Jay Kenty panning gold at the Kenty discovery, October, 1931 49 No. 3 vein, Kenty claims 49 Trenching among the trees, Kenty claims, Swayze township, June, 1932 50 Kenty No. 2 vein, looking southwest along the strike, June, 1932 50 No. 1 vein, Kenty claims 52 SKETCH MAPS AND PLANS Key map showing location of the Three Duck Lakes area 1 Key map showing location of the Swayze area 35 Plan of the Kenty claims showing faults and the veins that have been uncovered by stripping 51 COLOURED GEOLOGICAL MAPS (In pocket at back of report) Map No. 41c—Swayze Area, District of Sudbury, Ontario. Scale, 1 mile to the inch. Map No. 41d—Three Duck Lakes Area, District of Sudbury, Ontario. Scale, ¾ mile to the inch. [iv] Geology of the Three Duck Lakes Area By H. C. Laird INTRODUCTION In the summer of 1930, a spectacular discovery of native gold on the east shore of Three Duck lakes, Chester township, district of Sudbury, aroused new interest in an area that had seen prospecting in a quiet way at different times over a period of thirty years. This discovery, followed by others on the same lakes, caused an influx of prospectors during the summer of 1931, with the result that about 250 claims were staked along a favourable belt of rocks Key map showing location of the Three Duck Lakes area. Scale, 60 miles to the inch. between Mesomikenda1 lake and Schist lake. Further prospecting has disclosed other gold-bearing quartz veins, located chiefly in the environs of Three Duck lakes and Clam lake. Although the veins thus far uncovered are narrow, they contain in places high values in gold. The area dealt with in this report comprises the townships of Yeo, Chester, Benneweiss, the southern parts of Potier, Neville, St. Louis, and the southwestern part of Groves. It is bounded on the west by the Woman River area,2 and on the east by the Canadian National railway. The principal gold discoveries occur in Chester township, which lies about 13 miles in a straight line southwest of Gogama, on the Canadian National railway, and about 80 miles northwest of Sudbury. 1his lake is more generally known as Beaver lake. The Ojibwayan name, Mesomikenda, is said to have been derived from an island shaped like a beaver house opposite the Mekami river fire ranger's tower. 2See Map 231 A, Woman River sheet, accompanying Mem. 157, Geol. Surv. Can. [1] The area is comparatively easy of access, being conveniently reached in one day from Gogama with a power boat.