(Thousand short tons and thousand dollars) 
 
Year 
Fire clay 
—————————— Quantity
Value 
Miscellaneous clay 
—-———-—-——-—-— Quantity
Value 
Total 
————————~ 
Quantity Value 
1963                            
 448 $724 
 1,098 $1,623 
 1,546 $2,347 
1964                            
 376 644 
 1,169 1,620 
 1,545 2,264 
1965                            
1966                            
1967                            
 329 526 314 511 247 420 
 1,130 1,634 1,177 1,6g5 1,242 1,7O6 
 1,459 2,160 1,491 2,196 1,489 2,126 
300 
MINERALS YEARBOOK, 1967 
 
 
Table 5.—Clays sold or used by producers, by kinds 
 
 Gypsum.—Crude gypsum was produced at two underground mines in Martin
County. Production remained at approximately the same level as in 1966. Lath,
plaster, and wallboard were manufactured at plants adjacent to the mines.
A board plant was also operated in Lake County. 
 
 Lime.—The new (1966) plant of the Marblehead Lime Co. at Buffington
had its first year of full production. The entire output of the plant was
used in steelmaking, principally in Indiana, but some was shipped to Illinois.
Limestone used at the plant was brought in by lake transport from Michigan
quarries. 
 
 Perlite.—Crude perlite, mined in Western States, was expanded at plants
in 
Lake, Martin, and Scott Counties. The expanded product was used chiefly for
building plaster, insulation, and concrete aggregate. 
 
 Sand and Gravel.—Increased demand for building and paving materials
and fill was chiefly responsible for a 5-percent increase in output of sand
and gravel. Demand for industrial sand was lower than in 1966, but because
of a higher average price per ton, value was greater in 1967 by more than
26 percent. Production was reported in 69 counties from 216 commercial and
38 Government-and-contractor operations. Production was from 109 stationary
plants, 60 portable plants, 29 dredges, and one pit-run operation.