Table 11.—Crushed limestone sold or used by producers, by uses 
 
1966 
 Value 
Use —~———— 
 Short tons Average Short 
 Total per ton 
1967 
 
 
Value 
~— 
tons Average 
 Total per ton 
 
 
Concrete and roads.~ 
17,964,878 
$24,424,998 
$1.36 
 
19,689,862 
$28,050,527 
$1.42 
Agstone            
Railroad ballast      
Other uses1        
1,923,659 
341,078 
2,437,229 
2,929,806 
407,400 
3,416,551 
1.52 
1.19 
1.40 
 
2,109,868 
W 
3,012,046 
3,364,858 
W 
4,065,903 
1.59 W 
1.35 
 W Withheld to avoid disclosing individual company confidential data; included
with "Other uses." 
 1 Includes riprap, cement, coal mine dusting (1967), fertilizer filler,
stone sand, flux (1967), and other uses, and uses indicated by symbol W.

 THE MINERAL INDUSTRY OF KENTUCKY 357 
 
valued at $1.7 million, an increase of 15 percent over the previous year's
total. 
 
 Lime.—National Carbide Co. regenerated lime by calcining sludge at
plants in Marshall and Jefferson Counties. 
 
 Perlite.—Grefco, Inc. expanded perlite from Western States at its
Florence plant in Boone County. W. R. Grace & Co. expanded perlite at
the Wilder plant near Newport. 
 
 Sand and Gravel.—Sand and gravel was mined by 22 producers, including
the State and two county highway departments, at 33 operations in 21 counties,
led by Jefferson, Boone, and Trimble. Production decreased 1 percent below
the 1966 record. Of the commercial production, 92 percent was processed,
70 percent transported by truck, 20 percent by water, and 10 percent by rail.

 
 Stone.—Eighty producers crushed limestone at 116 operations in 67
counties. Leading counties were Livingston, Jefferson, and Meade. 
 
 Vermiculite.—W. R. Grace & Co. exfoliated vermiculite from Southeastern
States at the Wilder plant, near Newport. 
METALS 
 
 The value of metallic ores accounted for less than 1 percent of the total
mineral production value in Kentucky. 
 
 Ferroalloys.—Shipments of ferroalloys, including ferromanganese, silicomanganese,
silvery pig iron, ferrosilicon, ferrochromium, and ferrochromium-silicon
decreased 10 percent below 1966 levels. 
 
 Lead.—Lead concentrate was recovered as a byproduct of fluorspar milling
and the tonnage increased 75 percent. 
 
 Pig Iron and Stecl.—Armco Steel Corp. produced foundry and basic pig
iron at Ashland; output increased 6 percent. Steel was produced by the following:
Armco Steel Corp., at Ashland; Interlake Steel Corp., at Newport; Green River
Steel Co., at Owensboro; and Kentucky Electric Steel Co., near Princess.

 
 Silver.—About 568 troy ounces of silver was produced as a byproduct
in milling fluorspar ore. 
 
 Zinc.—Production of zinc concentrates decreased 4 percent below 1966
output; most of the zinc was produced by EaglePicher Co. at the Hutson mine.
Some zinc concentrates were recovered as a byproduct of fluorspar milling.

 
 
 
 
 
 
 
 
 
 
 TotaL_.. 22,666,844 31,178,755 1.38 24,811,776 35,481,288 1.43