MINERALS YEARBOOK. 1967 
total value of mineral 
628 
 
600 
 
 
 
 
 
 
500 
 
 
 
 
 
 
400 
 
U, 
 
0 
 
0 
-o 
C 
0 
 
300 
E 
u-i 
 
-j 
 
 
 
 
200 
 
 
 
 
100 
 
 
 
 
 
 
 
Figure 1.—Value of coal, 
sand and gravel, and stone and production in Ohio. 
1970 
 
 
REVIEW BY MINERAL COMMODITIES 
 
NONMETALS 
 
 Abrasive Stones.—Abrasive stone (grindstone) production has continued
to decrease, since The Hall Grindstone Co. at Constitution, Washington County,
discontinueci business in July 1966. All 1967 production, at one operation
in Lorain County, was a byproduct of sandstone 
 
quarrying at Amherst by Cleveland Quarries Co. 
 
 Cement.—Production, shipments, and value of portland cement decreased
as plants operated at about 75 percent of the capacity compared with 81 percent
in 1966. Lower production and shipments also were recorded for masonry cement.