Excerpt from California Mineral Production and Directory of Mineral Producers for 1940

As revealed by the following, salient features of 1940 as compared with the previous year were: All groups Of mineral substances, such as metals, structural materials, industrial minerals and salines showed an increase in total value, with the exception of the fuels which showed a decreased value. Of the year's mineral output quicksilver Showed the greatest increase in value followed in turn by cement, miscellaneous stone, tungsten ore, gold, copper, magnesite, soda, mineral water, etc., while decreases in amount and value were Shown by petroleum, natural gas, brick and hollow building tile, and potash. The greatest annual value for their output in California was recorded by lime, limestone, molybdenum ore, gypsum, silica (glass sand), soda, and sulphur.

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