Table 
4.—Employment 
and 
injury 
experience 
in the mineral industries 
 
Year and industry 
Average 
men 
working 
daily 
Days 
Active 
Man- 
days 
worked 
(thou- 
sands) 
Man- 
hours 
worked 
(thou- 
sands) 
Number of injuries 
————————— Fatal Non-

fatal 
Injury rates per 
million man-hours 
——-—————— 
 Fre- Se- 
quency verity 
1966: 
Coal              
Peat              
Nonmetal         
Sand and gravel     
Stone          
Total'         
1967: P 
Coal              
Peat              
Ndnmetal          
Sand and gravel     
Stone             
2,047 
30 
834 
1,145 
3,106 
261 
260 
256 
242 
292 
534 
8 
213 
277 
907 
4,113 
70 
1,689 
2,402 
7,478 
 2 136 
 4 
 28 
 3 38 2 158 
33.55 3,88657.31 1.11816.58 2,43217.07 7,87321.40 3,704 
 
7,162 
271 
1,938 
15,752 
7 364 
23.55 4,239 
 
2,150 
25 
885 
1,110 
3,160 
24~ 
228 
257 
232 
279 
534 
6 
228 
257 
883 
4,232 
46 
1,798 
2,227 
7,277 
 7 138 
 2 
 24 
 1 44 
 127 
34.26 10,87043.94 85713.35 28020.20 4,99417.45 646 
 260 1,908 15,580 8 385 22.02 4,003 
THE MINERAL INDUSTRY OF INDIANA 
 ______ Total 1 7,335 
P Preliminary. 
1 Data may not add to totals shown because of independent rounding. 
 
 
 
REVIEW BY MINERAL COMMODITIES 
299 
 
NONMETALS 
 
 Abrasive Materials.—For more than 150 years, sandstone has been quarried
in Orange County for fabrication of whetstones at a mill near Orleans. This
is one of the oldest quarrying and mineral-processing operations in the State.

 
 Cement.—Shipments of portland cement continued to increase, exceeding
the record high established in 1966 by more than 4 percent. The output of
masonry cement was slightly lower than in 1966. Portland cement was produced
at five plants, four of which also produced masonry cement. The average mill
value of portland cement was $3.34 per barrel compared with $3.26 in 
1966. The price of masonry cement remained unchanged at $3.09 per barrel.
Yearend stocks of portland cement were nearly 1.9 million barrels compared
with 2.5 million (adjusted) in 1966. About 39 percent of the portland cement
shipped was used within the State. Out-of-State shipments were principally
to Illinois, Kentucky, and Wisconsin; shipments were also made to 13 other
States. Over 4.5 million barrels of portland cement were shipped into Indiana
from plants located in other States, principally Illinois, Kentucky, Michigan,
New York, and Ohio. 
 Nearly 3.5 million tons of limestone and more than 1 million tons of slag,
clays and shale, gypsum, sand, air-entraining compounds, and grinding aids
were used in manufacturing portland cement. Approxi 
mately 329 million kilowatt-hours of electrical energy was used at the plants.
The dry process of manufacture was used at three plants and the wet process
at two plants. 
 Annual finished portland cement capacity of Indiana plants was 18.4 million
barrels. 
 Lone Star Cement Corp. continued development of its new plant near Greencastle,
scheduled to go onstream early in 1969. The plant will have a single 580foot
kiln and a direct digital control computer process system. Planned capacity
is 4 million barrels per year. The Lehigh Portland Cement Co. plant at Mitchell
was renamed the Virgil J. Grissom plant after astronaut Lt. Col. Grissom,
a native of Mitchell, who was killed at Cape Kennedy, Florida, in January.

 
 Clays.—Clay production was reported from 34 clay and shale pits operated
by 27 companies in 20 counties. 
 Although clay output stayed at approximately the same level as in 1966,
the demand for clay for various uses shifted during 1967. Clay for use in
manufacturing heavy clay products, notably building brick and tile, decreased
substantially. Most of this loss was made up by an increased demand for clay
for use in lightweight aggregate and cement. 
 Figures compiled by the Indiana Geological Survey indicated that the value
of products manufactured from clay and shale, excluding cement, was $41.3
million.