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TABLE SHOWING COMPARATIVE VALUE OF MINERAL PRODUCTION,
IRIDIUM. (See PLATINUM.)
BRICK AND TILE
ONYX AND TRAVERTINE
PUMICE AND VOLCANIC ASH
SILICA-SAND AND QUARTZ
SOAPSTONE OR TALC
LETTER OF INTRODUCTION.
The Bulletin herewith presented of the mineral industries of Cali. fornia is the result of a painstaking effort to so compile the statistics of production that they will be of actual use to producers and to those interested in the utilization of the mineral products of our state. In addition to the mere figures of output, we have included descriptions of the uses and characteristics of many of the materials, as well as a brief mention of their occurrences.
The compilation of accurate and dependable figures is an extremely difficult undertaking, and the State Mineralogist takes the opportunity of here expressing his appreciation of the universal co-operation of the producers in making this work possible. The response to our request for early replies is particularly pleasing. A fuller appreciation of the value of early responses to the requests sent out at the beginning of each year, will result in earlier publication of the data in the future.
It is the evidence herein put forth that should make us realize the magnitude of our latent mineral resources in this state. The total value for 1915 reached the sum of over ninety-six and a half million dollars, being a considerable increase over the preceding year.
For the current year of 1916, there is promise of still greater results in many lines. Except for the year 1883, the gold yield for 1915 was the largest California has shown since 1864. In addition to this, many inquiries are being received relative to this state's resources in the industrial minerals, such as asbestos, chrome, magnesite, manganese and many others.
DEC 23 1953