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Area: 7,240 square miles.
Location: Southern portion of state. Riverside is the fourth county in the state in size and the seventeenth in regard to the total value of mineral output for 1915. Within its borders are included mountain, desert, and agricultural land. Its mineral resources include metals, structural and industrial materials, and salines, some of the more important being asbestos, borax, brick, cement, clay, coal, copper, gems, gold, graphite, gypsum, iron, lead, limestone, manganese, magnesite, marble, mineral paint, mineral water, nitre, salt, glass-sand, soapstone, silver, miscellaneous stone, and tin.
Commercial production for 1915 was as follows:
Location: North central portion of state. Sacramento stands twelfth among the counties of the state as a mineral producer, the output, principally gold, for 1915 being valued at $2,562,281, as compared with the 1914 production, worth $2,632,658. In regard to gold output alone this county ranks fourth, being exceeded only by Amador, Nevada, and Yuba counties. Its mineral resources include: Brick, clay, gold, natural gas, platinum, silver, and miscellaneous stone.
Area: 1,392 square miles.
Location: West central portion of state. Although twenty-sixth among the counties of the state in regard to value of total mineral production, San Benito leads in one importan: branch of the mineral industry, namely, quicksilver.
Its other mineral resources, many of them undeveloped, include: Antimony, bituminous rock, chromite, coal, gypsum, gems, limestone, mineral water, soapstone, and miscellaneous stone.
Commercial production for 1915 was as follows:
Area: 20,157 square miles.
Location: Southeastern portion of state. San Bernardino, by far the largest county in the state, ranks eleventh as regards the value of its mineral output for 1915, with a total of $2,674,042, as compared with the 1914 total of $1,614,606. The marked increase is due mainly to tungsten and gold, the well-known Atolia district contributing the former.
This county, consisting largely of mountain and desert country, is highly mineralized, a few of the more important mineral resources
being: Asbestos, barytes, borax, brick, cement, clay, copper, gems, gold, gypsum, iron, lead, limestone, manganese, marble, mineral paint, mineral water, nitre, potash, salt, glass-sand, silver, soapstone, soda, miscellaneous stone, talc, tungsten, tuff, vanadium, and zinc. Commercial production for 1915 was as follows:
*Includes dolomite, gypsum, lime, manganese, marble, mineral paint, soapstone and talc
Area: 4,221 square miles.
Population: 140,000 (estimate by Chamber of Commerce, 1913).
San Diego, first in California in the production of gem stones, ranks thirty-sixth in the total value of its mineral output. This figure for 1915 equaled $211,129, as compared to the 1914 output, worth $315,267. Aside from minerals commercially produced, as shown below, San Diego County contains deposits of asbestos, bismuth, lithia mica, marble, potash, soapstone, tin, and tungsten.
A new development is the shipping of pebbles for grinding mills. Commercial production for 1915 was as follows:
$21,025 526 2,465 1,364 1 1,035
Area: 43 square miles.
Population: 527,000 (estimate by Chamber of Commerce, 1915). Surprising as it may appear at first glance, San Francisco County is listed among the mineral producing sections of the state, actual production consisting of crushed rock, sand, and gravel. Small quantities of various valuable mineral substances are found here, including cinnabar, gypsum, lignite, and magnesite, none, however, in paying quantities. In forty-second place, commercial production for 1915 was as follows:
Area: 1,448 square miles.
San Joaquin County reported a mineral production for the year 1915 having a total value of $248,394, as compared with the 1914 output, worth $129,930. Comparatively few mineral substances are found here, the chief ones being brick, clay, infusorial earth, manganese, natural gas, glass-sand, and miscellaneous stone.
In thirty-fourth place, commercial production for 1915 was as follows:
SAN LUIS OBISPO.
460 tons 161,923 M cu. ft.
$75,000 7,400 143,974 21,620
Area: 3,334 square miles.
Location: Bordered by Kern County on the east and the Pacific
Ocean on the west.
The total value of the mineral production of San Luis Obispo County in 1915 was $227,632, as compared with the 1914 output, worth $63,465.
Among its mineral resources, both developed and undeveloped, are: Asphalt, bituminous rock, brick, chromite, coal, copper, gold, gypsum, infusorial earth, limestone, marble, mineral water, onyx, petroleum, quicksilver, silver, and miscellaneous stone.
In thirty-fifth place, commercial production for 1915 was as follows:
1913). Location: Peninsula, adjoined by San Francisco on the north. San Mateo's most important mineral products are limestone and salt, the latter being derived by evaporation from the waters of San Francisco Bay. The total value of all mineral production during 1915 equaled $177,891, as compared with the 1914 figures of $246,478.
Small amounts of barytes, chromite, infusorial earth and quicksilver have been discovered in addition to the items of economic value noted below.
In thirty-ninth place, commercial production for 1915 was as follows:
on the south. Santa Barbara County owes its position as seventh in the state in regard to its mineral product to the presence of productive oil fields