ILLUSTRATIONS . 
Page. 
Plate I. Dredge on Solomon River, Seward Peninsula 1 
II. Map of Alaska, showing railway routes and known occurrences of eco- 
nomically important minerals 4 
III. Divide at head of the Chilkat; railway route, Lynn Canal to Fairbanks. . 10 
IV. A, Tatshenshini Valley (east fork of Alsek); railway route, Lynn Canal to 
Fairbanks; B, Abandoned valley in White River basin; railway route, 
Lynn Canal to Fairbanks 10 
V. A, Tanana Valley 50 miles from Fairbanks; railway route, Lynn Canal 
to Fairbanks; B, Copper River Valley at Copper Center; railway route, 
Cordova Bay to Eagle 12 
VI. Junction of Copper and Tazlina rivers; railway route, Cordova Bay to 
Eagle 12 
VII. A, Divide between Delta and Copper rivers; railway route, Copper Center 
to Fairbanks; B, Upper valley of Delta River; railway route, Copper 
Center to Fairbanks 14 
VIII. Tasnuna River Valley; railway route, Valdez Inlet to Eagle by way of 
Marshall Pass 14 
IX. A, Upper Matanuska Valley ; railway route up Matanuska Valley to Copper 
River; B, Lower Sushitna Valley; railway route, Resurrection Bay to 
Fairbanks 16 
X. Upper Sushitna Valley; railway route, Resurrection Bay to Fairbanks — 16 
XL Geologic reconnaissance map of southeastern Alaska 30 
XII. Topographic reconnaissance map from Controller Bay to Prince William 
Sound 76 
XIII. Mining operations on Cleary Creek, Fairbanks district 118 
XIV. Hydraulic elevator on Glacier Creek, Seward Peninsula 134 
Fig. 1. Sketch map of Copper Mountain region 51 
2. Map of Bering River coal field, showing areas underlain by coal 66 
3. Section from Lake Charlotte to Lake Kushtaka 68 
4. Sketch map of Prince William Sound region 79 
5. Sketch map of Matanuska Valley, showing coal field, so far as known 91 
6. Sketch map of Herendeen Bay region 105 
7. Map of Fairbanks district HI 
8. Map of lower Tanana region - 123 
9. Sketch of Seward Peninsula 132 
10. Diagrammatic section of cassiterite-bearing replacement vein in North Star 
mine 153 
IX 
