6 CONTENTS. 
Page. 
Rampart placer region, by L. M. Prindle and F. L. Hess 104 
( reneral statement 104 
Previous work 104 
Location. 104 
Communication and transportation facilities 104 
Mining activity 106 
Geographic sketch 106 
Relief 106 
Drainage 106 
Yukon 107 
Tanana 108 
Vegetation 109 
Geologic sketch 109 
Stratified rocks 109 
Igneous rocks 110 
Economic development Ill 
Northern area Ill 
Little Minook Creek Ill 
Hunter Creek 112 
Little Minook, Jr., Creek 112 
Hoosier Creek 112 
Florida Creek 113 
Interstream or " bar " gravels 113 
Ruby Creek 1 14 
Slate Creek 114 
Minook Creek 114 
Quail Creek, of Troublesome 114 
S< mthern area „ 115 
Pioneer Creek 115 
Eureka Creek 117 
Glenn Creek 117 
Shirley bench 118 
Rhode Island Creek and Gold Run 118 
Omega Creek 118 
Thanksgiving Creek 118 
Summary 119 
General outlook „ 119 
Outlook for hydraulic mining 1 19 
Recent development of Alaskan tin deposits, by Arthur J. Collier . . 120 
Introduction 120 
Lode deposits 120 
Lost River lodes 121 
Location • 121 
Cassiterite Creek developments 121 
Tin Creek developments 123 
Cape Mountain lode 124 
Location and geologic relations 1 24 
Bartels Company developments 1 24 
Brooks Mountain prospects >. 125 
Ears Mountain prospects 1 25 
I )arl >y Mountains 125 
Placer tin deposits 126 
( ieneral characters of A laskan stream tin 1 26 
