THE MINERAL INDUSTRY OF MISSOURI 475 
 
Table 13.—Stone sold or used by producers, by kinds 
 
(Short tons and thousand dollars) 
Granite 
Limestone 
 
Sandstone 
Other 
stone1 
Total stone 
 
(dimension) 
Year 
 
— 
(dimension) 
 
 
—————______ 
 
Quan- Value tity 
Quantity 
Value 
Quan- Value tity 
Quantity 
Value 
Quantity 
Value 
 1963 2,958 $317 29,776,088 $42,711 3,655 $55 1,101,840 $3,047 30,884,541
$46,130 
 1964 3,226 292 30,567,256 44,586 2,208 29 914,026 3,077 31,486,716 47,984

 1965 3,124 234 34,952,692 49,770 2,258 52 1,289,359 3,518 36,247,433 53,574

 1966 2,471 253 33,698,016 48,468 1,500 36 1,537,760 4,636 35,239,747 53,393

 1967 2,047 246 35,496,586 49,133 1,500 36 1,084,679 4,538 36,584,812 53,953

 
1 Includes crushed granite, marble, miscellaneous stone, and crushed sandstone.

 
 Increased use of crushed limestone in highway construction accounted for
most of the increase in Missouri stone output during the year. A slight decrease
in residential building and less industrial construction lowered stone output
for these markets. Major uses of crushed stone were concrete aggregate, roadstone,
cement and lime manufacturing, agricultural limestone, and riprap. Stone
production was reported from 79 of the State's 114 counties. Production of
more than 1 million tons each was reported from 10 counties. 
 Industry increased efforts to reduce air and water pollution and to keep
unsightly operations at a minimum. The possibility of satisfying an increasing
share of future stone needs from underground mines was studied. 
 O'Fallon Quarry & Supply Co., St. Charles County, expanded its quarry
operation after purchasing a hot-mix asphalt plant from Rock Hill Asphalt
and Construction Co. of Clayton. The plant has been permanently set up in
the quarry for some years, with the aggregate being furnished by O'Fallon
Quarry & Supply Co. 
 Adrian Materials Co., Boone County, reported completion of its first year
of successful underground quarrying. Mining was by room and pillar, with
rooms averaging 20 feet in height and 35 feet in width. The quarry was opened
in Callaway Limestone of Devonian age. 
 Asphaltic sandstone for road surfacing was produced by Bar-Co-Roc Asphalt
Co. in Barton County and Midwest Silica Rock Co. in Vernon County. 
 
 Sulfur.—Interest in the recovery of by 
 product sulfur  was receiving increased 
 attention from various operations in the 
State, largely as an air pollution abatement attempt. 
 Plans for building a sulfuric acid plant at St. Joseph Lead Co.'s Herculaneum
lead smelter were completed at the end of the year, and construction was
scheduled to begin in 1968. The plant, utilizing sulfur dioxide gas resulting
from sintering lead concentrates at the smelter, will have a capacity of
about 100,000 tons of sulfuric acid per year. 
 Missouri Lead Operating Co. was installing equipment to make acid at the
rate of about 50,000 tons per year at its new lead smelter at Buick. Research
on recovery and utilization of sulfur compounds from large fuel-burning installations
was also actively conducted during the year. 
 
METALS 
 
 Missouri has been the Nation's leading producer of lead for over half a
century and is expected to continue in that role. Coproducts of lead production
were copper and zinc in appreciable quantities. 
 In recent years the State has become an important iron. ore producer. New
mine and plant facilities will have a production capacity of about 3 million
tons of highgrade iron ore pellets. Exploration for other iron deposits is
continuing. 
 
 Aluminum.—Plans for constructing an aluminum reduction plant and a
steamgenerating plant at New Madrid in southeast Missouri were disclosed
late in 1967. The reduction plant would be built by Noranda Manufacturing,
Ltd., a major mining firm in Toronto, Canada. Minimum annual capacity would
be 60,000 to 70,000 tons of aluminum ingot. A 500,000-kilowatt steam generating
plant would be constructed to supply power for the plant. 
 
 Copper.—Copper flotation circuits were operated at the Viburnum, Federal,
and