CONTENTS. 



Page. 



Letter of Transmittal v 



Contents vii 



Illustrations ix 



Preface xi 



Brief Outline of Results xiii 



Chapter I. — General Description of Eureka District 1 



II. — Surface Geology 5 



III. — Structure of Prospect Mountain 11 



IV.— Structure of Ruby Hill IS) 



V. — Ores of Prospect Mountain and Ruby Hill 51 



VI.— The Ore Deposits (34 



VII.— The Source of the Ore 80 



VIII. — The Manner of Deposition of the Ore 93 



IX.— Water 107 



X. — Do the Ruby Hill Deposits form a Lode? ., Ill 



XI. — Assaying 120 



XII.— Prospecting 139 



XIII.— Tribute System 150 



XIV. — Timbering in the Eureka Mines 153 



XV.— Metallurgy 158 



XVI.— Adams Hill 165 



XVII.— Future of Eureka District 160 



XVIH.— Summary 175 



Index 195 



(vii) 



