The geology and ore deposits, California
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The preparation of this report has been greatly facilitated by-courtesies rendered the writer by D. M. Riordan, President of the BullyHill Copper Mining & Smelting Co., and by John B. Keating and HerbertR. Hanley. managing officers actively in charge at the mines. Thelaboration and further study of the notes and collections were carried in the laboratories of the Departments of Geology and Mining at Columbia University, and the writer takes pleasure also at this point in expressing his acknowledgments to Profs. James F. Kemp, A. W. Grabau,Charles P. Berkey, and William Campbell, for advice and assistance.