REPORT ON PROGRESS OF INVESTIGATIONS OF 
MINERAL RESOURCES OF ALASKA IN 1906. 
By Alfred H. Brooks and others. 
ADMINISTRATIVE REPORT. 
By Alfred H. Brooks. 
PREFACE. 
This volume, like those previously issued, a will (1) summarize the 
results of the field work in Alaska for the year and (2) present a con- 
cise statement of the advancement of the mining industry in the Ter- 
ritory. It affords a means of giving to the mining public the impor- 
tant results of investigations that are underway or completed, pending 
the appearance of the more elaborate reports, always slow of prepara- 
tion as well as of publication. Many of the papers contained in this 
volume have been prepared before the completion of the study of the 
material collected, and hence the conclusions advanced may not be 
accepted with the same authority as those contained in the detailed 
reports to be issued later. Nevertheless, it is believed that these pre- 
liminary statements are of value to the prospector and miner, even if 
they should be regarded only as suggestions. 
As in former volumes, the papers here presented fall into three 
groups — (1) summaries of progress in various phases of the mining 
industry during the year, (2) preliminary accounts of investigations in 
progress or completed, and (3) statements of the results of minor 
investigations not to be published elsewhere. 
The attempt is here made to cover the entire field of Alaska mining 
interests ; but to do this it has been necessary to use, in part, informa- 
tion compiled from various sources. It is obviously impossible for the 
twelve geologists attached to the Alaska division to visit annually all 
the mining districts in the Territory and at the same time to carry on 
the more important work of studying the conditions of occurrence and 
a Report on progress of investigations of mineral resources of Alaska in 1904: Bull. U. S. Geol. Survey 
No. 259, 1905; idem, 1905: Bull. U. S. Geol. Survey No. 284, 1906. 
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