CONTENTS. 
The Nome region — Continued. 
Economic geology — Continued. 
Lode deposits — Continued. 
Antimony [39 
Gold I ;; (; 
Graphite L39 
Placer deposits and mining IK) 
General development 141 
Gold fields of Solomon and Niukltjk river basins, by Philip S. Smith . . . L46 
Introduction 146 
Solomon River basin 146 
Dredging 146 
Lode mining 147 
Placer mining 147 
Niukluk River basin 147 
Bench gravels of the Niukluk 147 
Fox River 148 
Mystery Creek 148 
Bear Creek 149 
Melsing Creek 149 
Ophir Creek 150 
Richter, Camp, and Goldbottom creeks 151 
Elkhorn Creek 152 
Casadepaga River 152 
Mouth to Bonanza Creek 152 
Bonanza Creek to Penelope Creek 152 
Penelope Creek to Moonlight Creek 153 
Auriferous-lode discoveries 1 55 
Description of localities 155 
Association of lodes and contacts 156 
Silver-lead lode 156 
Geology and mineral resources of Iron Creek, by Philip S. Smith 157 
Introduction 157 
Physiography 158 
Stages of valley cutting 1 58 
Evidences of glaciation 159 
Genera] geology 1 60 
Mining developments 161 
General conditions 161 
Ditch construction 161 
Mining on main stream 162 
Mining on tributaries 163 
Summary 163 
The Kougarok region, by Alfred H. Brooks 164 
Introduction 164 
Topography 1 64 
Geology 166 
Development 169 
Distribution of auriferous gravels 172 
Southern belt 172 
General description 172 
Toffee Creek 174 
Dahl Creek ■ 174 
