During the summer of 1901 the writer, assisted by Mr Corey C. Brayton, spent about two months in making a preliminary reconnaissance of the Ketchikan mining district, and later about one month in a more general reconnaissance of other parts of southeastern Alaska. The results of this work are to be published by the U. S. Geological Survey in a report entitled “Preliminary Report on the Ketchikan Mining District of Southeastern Alaska.” In view of the little that is known of this region, it has seemed worth while to abstract the more important conclusions bearing on the general geology of the region.

A few small areas in this region have been studied in some detail and many facts have been gathered, but almost no attempt has been made to correlate them. The work of the Canadian geologists, however, near the boundary and in British Columbia has added to the . . .

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