16 ALASKAN MINERAL RESOURCES IN 1904. [bull. 259. 
begun by Mr. A. C. Spencer the previous season. The mineral deposits 
of Sitka, of Admiralty Island, and of a belt of the mainland between 
Sumdum and Behm Canal were examined and a supplementary study of 
some of the principal ore bodies of the Ketchikan district, previously 
reported on by Mr. Alfred H. Brooks, was also made. An outline of 
the economic results is here presented; the details will be given in 
later publications. 
Mr. Spencer's report on the Juneau district, based on the field work 
of 1903, will soon be submitted for publication and will include an 
account of the geology and resources of Admiralty Island by Mr. 
C. W. Wright. The part of the Juneau report dealing with the 
Treadwell deposits forms a section of this bulletin. 
Controller Bay region. — Mr. George C. Martin made a supplemen- 
tary examination of the coal and oil fields of this district. His com- 
plete report a is now in press, and only a summary appears here. 
Copper River region. — No surveys have been made in the Copper 
River basin since 1902. The final results of the latter investigations 
are now ready for publication. 6 
Tumagain Arm region. — Mr. F. H. Moffit completed a reconnais- 
sance survey of the gold placer fields tributary to Turnagain Arm. 
An outline of his report is included in this bulletin. Mr. E. G. Ham- 
ilton, who accompanied him as topographer, made reconnaissance sur- 
veys of the same area. 
Kachemak Bay coal -field. — Mr. R. W. Stone, under the direction 
of Mr. George C. Martin, made an examination of the coal fields 
tributary to Kachemak Bay. The results of his work are embodied 
in his account of the coal of southwestern Alaska in this bulletin. 
The more complete report, with maps and photographs, will be sub- 
mitted later. 
Southwestern Alaska. — Mr. George C. Martin, aided by Mr. R. W. 
Stone, continued his geologic work of the previous year along the 
west shore of Cook Inlet. He was fortunate in having the coopera- 
tion of Mr. T. W. Stanton, who spent the season in collecting fossils 
and studying the stratigraphy of this region. Mr. Martin's results 
are not yet submitted, but his observations on the oil region are given 
on another page. 
Seward Peninsula. — Mr. T. Gerdine, with the aid of Mr. R. B. 
Oliver and Mr. W. R. Hill, completed a detailed topographic map 
(scale 1:15,000) of the most important gold-producing area near Nome. 
Mr. Arthur J. Collier made a supplementary examination of the tin 
deposits of the York region, an account of which is given on another 
page of this bulletin. 
a Martin, G.C., The petroleum fields of the Pacific coast of Alaska, with an account of the Bering 
River coal deposits: Bull. U. S. Geol. Survey No. 250. 
bMendenhall, W.C., Geology of the central portion of the Copper River basin: Prof. Paper U.S. 
Geol. Survey No. 41. 
