Identifier: califor1920niami00bradrich (find matches)
Title: California mineral production for 1920, with county maps
Year: 1921 (1920s)
Authors: Bradley, Walter W. (Walter Wadsworth), b. 1878 California State Mining Bureau
Subjects: Mines and mineral resources
Publisher: Sacramento : California State Print. Office
Contributing Library: University of California Libraries
Digitizing Sponsor: Kahle/Austin Foundation and Omidyar Network

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ed by silver and lead. An interesting feature of the i-eturns is the status shown by thestructural materials group. The total value for this group jumpedfrom $16,796,784 to $29,723,405, due mainly to cement, miscellaneousstone (crushed rock, sand and gravel), brick and tile, and magne-site, in the order named. This indicates a renewal of building andconstruction activity, which has been curtailed during the war period. The industrial group showed an increase in total value from$2,041,981 to $3,567,760. The more important items were diatoma-ceous earth, barytes, litliia and talc. In the salines group, there wereimportant increases made by borax and soda, but Avhicli were nearlycounterbalanced by a decrease of almost a million dollars by potash. The figures of the State Mining Bureau are made up from reportsreceived direct from the producers of the various minerals. Care isexercised in avoiding duplication, and any error is likely to be on theside of under- ratlicr than over-estimation.
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STATISTICS OP ANNUAL PRODUCTION. 13 California jaelds commercially a greater number and variety ofmineral products than any other state in the United States, and prob-ably more than any other equal area elsewhere of the earth. Previousto 1916, the total annual value of her output was surpassed l)y but fourother states, they being the great coal and iron producers of east ofthe Mississippi River. In 1916 and 1917, because of their enormousincreases in copper output, Montana and Arizona passed California intotal value for those years; and Arizona for 1918. Of one item, atleast, borax, California still remains the sole producer; and for manyyears was also the sole domestic source of chromite and magnesite.We produce at least 75% of the quicksilver of the United States. Forsume years we have been leading all others in gold and platinum; whilealternating in the lead with Colorado in tungsten, and with Oklaliomain petroleum. Development of our hydroelectric resources in California is nowher

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