Publisher's Synopsis
Excerpt from The Geology and Ore Deposits of the Bully Hill Mining District, California
The geological field work of the Bully Hill district, Upon which this paper is based, was begun July 1, 1908, and covered a period of three months. The time was found too short for a complete report and the district was again visited in the early part of July, 1912, from which time detailed study of the locality continued until September of the same year. This paper is the result of observations made in the mines in the immediate vicinity of Winthrop, Shasta county, Cal., during these two periods of study.
The preparation of this report has been greatly facilitated by various courtesies rendered the writer by D. M. Riordan, President of the Bully Hill Copper Mining Smelting Co., and by John B. Keating and Herbert R. Hanley, managing officers actively. In charge at the mines. The elaboration and further study of the notes and collections were carried on in the laboratories of the Departments of Geology and Mining at Colum bia University, and the writer takes pleasure also at this point in express ing his acknowledgments to Profs. James F. Kemp, A. W. Grabau, Charles P. Berkey, and William Campbell, for advice and assistance.
In order that one may appreciate at first reading the significance of some of the details which follow, and for the sake of clearness, a brief outline of the geological relationships is here given, together with' certain conclusions which have been reached regarding the genesis of the ores and the gypsum masses.
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