472 
MINERALS YEARBOOK, 1967 
 
about 40 to 45 feet of Grass Creek-Saverton-Shales below the Burlington.
A small quantity of gypsum, used as retarder, was obtained from out-of-State.

 The plant's production facilities were operated by a complete computer-control
complex, insuring a consistent high-quality product. Two closed-circuit television
cameras provided the computer operator with a constant view inside the kiln
where pulverized coal burned the limestone and shale slurry mixture into
clinkers at 2,6000 F. After firing, the clinkers and gypsum were ground into
finished cement and stored in silos for shipment by barge, rail and truck
to bulk cement distribution stations throughout the Midwest, and to local
ready-mix producers. 
 To support the new plant, Universal Atlas Cement Co. built distribution
stations in Bettendorf (Davenport), Iowa, and Summit, Ill. in addition to
an existing station in St. Louis. Two new self unloading cement barges will
supplement an older cement barge. 
 At yearend, Mississippi River Corp. announced expansion of the cement-producing
capacity of its subsidiary, River Cement Co., at Selma, Jefferson County,
by 2 million barrels per year. The present plant was completed in 1965 and
marked 
the company's entry into the cement industry. It acquired several ready-mix
companies to provide an outlet for some of the plant's production. The new
plant facilities will include a duplicate of the original 560-foot kiln,
storage silos, grinding and finishing mill, cement cooler, and a dust collection
system capable of eliminating 99 percent of the dust produced. 
 
 Clays.—The tonnage of clay and shale mined in Missouri during the
year declined slightly; however, value increased by nearly 4 percent. Of
the total production, approximately 49 percent was refractory clay, 36 percent
was used for cement, and 15 percent was used in structural clay products
and lightweight aggregate. Clay and shale used in cement showed the only
increase, about 33 percent, during the year. 
 Missouri ranked third in fire clay production; many of the larger refractory
plants were located in the State. Mergers and modernizations involved several
of Missouri's refractory manufacturers in 
1967. 
 The merger of United States Gypsum Co. and A. P. Green Refractories Co.
became effective at yearend. The A. P. Green plant at Mexico, Audrain County,
was reportedly the world's largest. 
 
Table 8.—Clay sold or used by producers, by kinds 
(Thousand short tons and thousand dollars) 
 
Year 
Fire clay 1 
 
 
Quantity Value 
 
Miscella clay 
 
Quantity 
neous 
 
 
Value 
Total 
 
 
Quantity Value 
 
1963                                  
1964                                 
1965                                 
1966                                  
1967                                  
850 
1,002 
1,128 
1,285 
1,131 
$3,568 
3,905 
4,313 
4,898 
4,747 
896 
964 
1,098 
1,044 
1,174 
$899 
969 
1,126 
1,091 
1,473 
1,746 
1,966 
2,226 
2,329 
2,305 
$4,467 
4,874 
5,439 
5,989 
6,220 
1 Includes diaspore and burley. 
 
 Harbison - Walker Refractories Co. merged with Dresser Industries, Inc.,
and became a division of Dresser. HarbisonWalker plants are located at Fulton,
Callaway County, and Vandalia, Audrain County. 
 The Missouri Mill and Foundry Clay Co. at High Hill, Montgomery County,
was purchased in October 1967 by Combustion Engineering, Inc., of New York
City. The 17-year-old firm now operates as a 
division. 
 Expansion and modernization by Kaiser Refractories at its Mexico, Audrain
County, plant included enlargement and automation of the tunnel kiln, grinding
and dry press facilities, and specialty manufacturing facilities. The machine
shop was enlarged and a modern office building was constructed. Major items
completed included expansion of the finished products warehouse, remodeling
of the central stores