THE MINERAL INDUSTRY OF CALIFORNIA 149 Revised.iNorthern and Southern California
are divided by the northern boundaries of San Luis Obispo and KernCounties
and the western boundsries of Inyo and Mono Counties. 
 
was used chiefly as an ingredient in welldrilling muds. 
 
 Cement.—Shipments of portland cement totaled 42.0 million barrels,
down from 45.4 million in 1966, reflecting a generally depressed construction
industry. Sales to ready-mixed concrete companies and building materials
dealers dropped nearly 3 million barrels. Of the total shipments, 37 million
barrels was in bulk and 5 million in bags. Producers shipped about 4.4 million
barrels to out-of-State customers and California customers received 556,000
barrels from producers outside the State. Apparent consumption in California
was 38 million barrels compared with 42 million in 1966. 
 New construction and modernization programs increased annual production
capacity to 62.3 million barrels in 1967. In February, Pacific Western Industries,
Inc. began shipping from its new 3-millionbarrel-per-year dry-process Los
Robles plant, Kern County. American Cement Corp. announced tentative plans
for a 3million-barrel plant near Volcano, Amador County, and Creole Corp.,
a subsidiary of Texas Industries, Inc., planned construction of a 3-million-barrel
plant near Plaster City, Imperial County, where the company purchased a limestone
deposit. Calaveras Cement Division of The Flinkote Co., at San Andreas, Calaveras
County, planned construction of a slurry pipeline to convey crushed limestone
to the plant from its new quarry 17 miles away. Pacific Cement 
& Aggregates Division, Lone Star Cement Corp., announced plans for a
multimilliondollar modernization program for its Santa Cruz County cement
plant and limestone quarry that included a crushing and conveyor system,
and increased cement producing capacity. 
 
 Clay and Shale.—Total output, sold and used, of clay and shale declined
13 percent from that in 1966, attributed chiefly to a drop in shale production
for lightweight aggregate use. Fire clay and miscellaneous clay and shale,
produced for use in making cement and heavy clay products, comprised 66 percent
of all clays sold or used in 1967. Ball clay was mined at two properties
in San Bernardino County and one in Stanislaus County. Bentonite was produced
at two mines in Inyo County and one each in -Imperial, San Benito, and San
Bernardino Counties. Fuller's earth production came from two properties in
Inyo County, and kaolin was mined from one deposit in Mono County and two
in Orange County. Fire clay and stoneware clay were produced from 17 deposits
in seven counties with more than half the output coming from Riverside County.
Miscellaneous clays and shales, comprising 81 percent of the total output
of all clays, were mined at 61 properties in 29 counties, 77 percent of which
came from deposits in 10 counties— Calaveras, Kern, Los Angeles, Napa,
Orange, Riverside, San Bernardino, San Mateo, Santa Crux, and Ventura. 
 
Table 9.—Finished portland cement 
(Thousand 376-pound barrels and thousand dollars) 
District 1 
Active 
plants 
Capacity 
Dec. 31 
Produc- 
tion 
Shipm 
ents from mills 
Stocks 
at mills 
Dec. 31 
Esti 
mated 
con- 
sumption 
 
 
 
 
Quantity 
 — Value 
 ~— Average 
Total per 
barrel 
 
 
1966: 
Northern California Southern California.. 
Total          
1967: 
Northern California_ Southern California.. 
Total          
6 
7 
T21,650 
37,600 
18,930 
26,391 
19,020 
26,367 
 $63,088 $3.32 83,214 3.16 
1,372 
1,776 
17,912 
24,414 
 
18 
r59,250 
45,321 
45,387 
 146,302 3.22 
3,148 
42,326 
 
6 
8 
21,700 
40,600 
17,877 
24,178 
17,822 
24,212 
 61,109 3.43 76,852 3.17 
1,418 
1,744 
16,490 
21,701 
 
14 
62,300 
42,055 
42,034 
 137,961 3.28 
3,162 
38,191