630 MINERALS YEARBOOK, 1967 
 
in 1966. Production of clay used in heavy clay products (mainly building
brick) declined 5 percent to 2.8 million tons; clay used for manufacturing
cement decreased by 32,000 tons to 644,000 tons. Output of shale used for
manufacturing lightweight aggregate also decreased. Fire clay comprised 43
percent of the total clay production and was used chiefly in refractories
and for manufacturing heavy clay products. Most of the miscellaneous clay
and shale output was for manufacturing heavy clay products. Other uses of
Ohio clay included pottery and stoneware, floor and wall tile, and as rotary
drilling mud. Fire clay was produced in 16 counties; Tuscarawas, Columbiana,
Stark, and Jackson Counties led in output and supplied 67 percent of the
output. Miscellaneous clay and shale was produced in 34 counties; Cuyahoga,
Tuscarawas, Greene, and Starke Counties were the leading areas. 
 
 Gem Stones.—Gem and mineral specimen collectors were active at mines
and quarries throughout the State. Value remained the same as that of 1966.
Speciments collected included calcite, celestite, flint, and jasper. 
 
 Gypsuin.—Production and value of crude gypsum was slightly below that
of 1966; the average unit price also declined. Output from one underground
mine and one open pit in Ottawa County was calcined at nearby plants. Crude
gypsum shipped from outside the State also was calcined at the Lorain plant
of National Gypsum Co. In National Safety Competition, the Gypsum mine of
United States Gypsum Co. worked 66,291 man hours without any disabling injuries
and was awarded a Certificate of Achievement in Safety. 
 Iron Oxide Pigments.—Minnesota Mining & Manufacturing Co. discontinued
the production of red iron oxide pigment at its Copley plant at the end of
1966. 
 
 Lime.—Productjon of lime decreased and was 6 percent below the record
high year 1966. Lower demand for all major categories of lime was reported.
Production of chemical and other industrial lime decreased for the first
time since 1957. Although higher unit values were reported for three of the
four major uses of lime, total value of lime decreased 4 percent bdlow that
of 1966. Only agricultural lime decreased in average value per ton from $15.07
in 1966 to $14.55. The greatest change was in building lime, which increased
in value from $18.36 to $22.05 per ton. Ohio supplied 20 percent of the national
lime output and continued as the leading lime-producing State. 
 Of the total lime production, 2.1 million tons was captive tonnage or was
marketed in Ohio. Significant shipments were made to Pennsylvania (289,000
tons), Indiana (264,000 tons), Michigan (207,000 tons), New York (172,000
tons), and Illinois (156,000 tons). Quantities also were exported to Canada,
Chile, Australia, and the West Indies. Operators used mostly shaft-type kilns
for manufacturing quicklime. Hydrated lime producers used both batch and
continuous hydrators. Fuels used by- producers included bituminous coal,
coke, natural gas, and fuel oil. 
 Regenerated lime was produced in Montgomery and Ross Counties. Seventy percent
of the primary lime production, chiefly quicklime, was used for chemical
and other industrial uses. Sandusky County continued as the leading area
for lime production, accounting for 1.3 million tons valued at $16.7 million.

 
Table 6.—Lime sold or used by producers, by uses 
(Thousand short tons and thousand dollars) 
Year 
Agricultural 
Building 
Chemical and other industrial 
—~________________________________________________________________

Refractory 
 
Tot 
a!' 
 
Quan- Value tity 
Quan- Value tity 
Quantity Value 
Quantity 
Value 
Quantity 
Value 
1963      
1964      
1965      
1966      
1967      
 24 $393 23 352 27 410 17 253 16 234 
 369 $7,003 374 7,561 327 6,425 299 5,490 257 5,672 
 1,820 $22,187 2,147 26,209 2,387 27,905 2,574 28,740 2,550 28,548 
994 
1,120 
1,090 
968 
812 
$16,374 
19,186 
18,468 
16,514 
14,364 
3,207 
3,664 
3,831 
3,858 
3,636 
$45,957 
53,308 
53,208 
50,997 
48,817 
1 Data m 
ay not add to t 
otals shown becau 
se of independent rounding.