Annual report of the State Mineralogist for the year ending ... . proper representation of the facts with relation to these lines tothe Legislature of this State, they will make provision for the revisionof the statutes describing these lines, and the proper running and defin-ing of these lines in conformity therewith. The Preliminary Geological Map of the State represents the result ofthe expenditure of a very considerable amount of money. By virtueof your position as ex officio State Engineer, and the custodian of thedata in that office, it has been made possible in the compilation of thePre
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Annual report of the State Mineralogist for the year ending ... . proper representation of the facts with relation to these lines tothe Legislature of this State, they will make provision for the revisionof the statutes describing these lines, and the proper running and defin-ing of these lines in conformity therewith. The Preliminary Geological Map of the State represents the result ofthe expenditure of a very considerable amount of money. By virtueof your position as ex officio State Engineer, and the custodian of thedata in that office, it has been made possible in the compilation of thePreliminary Geological Map to give the public for the first time theresults of an expenditure of $100, 000 of the taxpayers money. In orderto utilize the maps of the State Engineering Department, it becamenecessary that the great State Map should be completed, which was done, with the exception of the correction of the county boundary lines, which, for reasons heretofore mentioned, could not be correctly defined thereon.Respectfully yours, HARRY I. WILLEY, Engineer.. GEOLOGY OF THE MOTHER LODE REGION. 23 GEOLOGY OF THE MOTHER LODE REGION. By Harold W. Fairbanks, B.S., Assistant in the Field. A few words of introduction concerning the scope of this article, andof the accompanying map, may not be out of place. The magnitude of the operations conducted on the Mother Lode goldbelt since the earliest days of mining in this State, and the economic im-portance of a thorough knowledge of the occurrence of its ores, as well asa desire to give a scientific description of one of the most remarkable met-alliferous deposits in the world, were the reasons for undertaking thefield work which is the basis of this report. The task attempted during three months in the field and two monthslaboratory work, was as follows: To make an examination of the lode onthe surface, and trace its croppings; to enter all the open mines, wherepermission could be obtained, in order to get a more accurate idea of theph