CONTENTS. PREFACE, BY ALFRED H. BROOKS DEVELOPMENT OF THE MINING INDUSTRY, BY ALFRED H. BROOKS_ Page. 7 10 10 13 19 24 28 31 36 38 40 40 41 41 42 44 48 50 50 51 51 52 53 53 54 54 56 60 60 63 66 66 69 70 70 86 86 90 91 92 92 93 GEOGRAPHY AND GEOLOGY, BY ARTHUR J. COLLIER-Continued. OUTLINE OF ECONOMIC GEOLOGY, BY ALFRED H. BROOKS. 108 111 Hints to prospectors.. Introduction... Gold in bed rock. Gold in placers_ Geologic maps. The future of the mining industry. DESCRIPTION OF PLACERS, BY ARTHUR J. COLLIER AND FRANK L. HESS 131 131 132 132 134 135 140 Introduction__. Distribution of gold. Classification of the placers Introduction_ Gravel-plain placers. 140 140 142 142 144 DESCRIPTION OF PLACERS, ETC.-Continued. Nome precinct-Continued. Streams tributary to Bering Sea between Cripple and Sinuk Sinuk River basin. Region west of Sinuk River. Eldorado River region Solomon River region Page. 215 215 217 221 Notes on recent developments in the Council region, by Philip S. 260 Creeks tributary to Grantley Harbor from the north_ 270 271 GEOLOGY AND MINERAL RESOURCES OF IRON CREEK, BY PHILIP S. SMITH 329 ILLUSTRATIONS. Page. PLATE I. A, Lightering freight at low tide, Nome; B, Characteristic creek valley Thompson Creek, tributary of Stewart River__ 58 II. A, Angular gold-bearing gravels on Grass Gulch; B, Creviced 178 III. A, Hydraulic elevator on Glacier Creek; B, Prospecting for placer gold with churn drill near Bluff_ 192 IV. Dredging on Solomon River_.. 232 V. A, Canyon of Ophir Creek, showing part of the Wild Goose 242 VI. A, Rough bowlders in the pay streak of a placer mine on VII. Hydraulic mining on Daniels Creek_. 252 284 In pocket. IX. Topographic reconnaissance map of the northwestern part of In pocket. X. Geologic reconnaissance map of the southern part of Seward In pocket. XI. Geologic reconnaissance map of the northwestern part of Sew- In pocket. FIG. 1. Sketch maps showing relative gold-bearing areas in Seward 2. Precinct map of Seward Peninsula__ 3. Profile of the western part of Seward Peninsula, showing old 4. Sketch of the coast from Cape York to Cape Prince of Wales. 7. Sketch map of part of Nome region, showing distribution of 8. Diagrammatic section of beach placers_ 12 42 47 47 55 123 150 155 9. Sketch map of second and third beach lines at Nome_. 161 162 11. Diagrammatic section of Anvil Creek valley, showing bench gravels 189 12. Sketch map and profile of high-bench gravels south of King Mountain 201 13. Sketch map and section of Big Hurrah mine_ 229 14. Diagram of part of Ophir Creek valley, showing position of benchplacer deposits___. 247 15. Diagram of cliff exposure near mouth of Daniels Creek 16. Sketch map and section of Daniels Creek placers___ 285 287 17. Diagrammatic representation of character of impregnated zones, Bluff region |