THE MINERAL INDUSTRY OF ILLINOIS 
28~ 
 
 The Illinois State Geological Survey reported the completion of 1,124 wells
in 1967; 570 were producing oil wells, one was a gas well, 311 were dry holes
in pools, and 242 were unsuccessful wildcats. Total footage drilled was 2,662,848,
of which 54 percent was in producing wells. Data do not include service wells,
structure tests, and natural gas storage wells. 
 According to the American Petroleum Institute, proved crude oil reserves
on December 31 totaled 335 million barrels, a 27-million-barrel decreaEe
from 1966. Proved reserves of natural gas on December 31 totaled nearly 259,000
million cubic feet, according to the American Gas Association. This is an
increase of 23,000 million cubic feet from 1966 estimates. Proved recoverable
reserves of natural gas liquids totaled 2.3 million barrels on December 31,
according to the American Gas Association. 
 
NONMETALS 
 
 Cement.—Portland and masonry cements were produced by four companies
with plants in La Salle, Lee, and Massac Counties. Portland cement shipments
declined over 1 percent, but increased over 5 percent in value. Shipments
of masonry cement declined nearly 4 percent, but total 
value declined only about 1 percent. Nearly 96 percent of the portland cement
shipments consisted of types I and II (general use and moderate heat). The
remainder was high-early-strength and special-use types. 
 Nearly 94 percent of the portland cement was shipped in bulk, the remainder
in bags. About 65 percent of the shipments were by truck and the remainder
by rail. A small amount was consumed at the plants. Nearly three-fourths
of the portland cement shipments were to ready-mixed concrete companies.
Over 10 percent went to highway contractors, 9 percent to concrete product
manufacturers, and nearly 5 percent to dealers in building materials. 
 About 68 percent of the portland cement shipments were to consumers in Illinois,
13 percent to Wisconsin, and 14 percent to Indiana, Iowa, Kentucky, and Tennessee,
combined. Of the masonry cement shipped, 33 percent went to consumers in
Illinois, 33 percent to Wisconsin, and over 25 percent to Tennessee. Approximately
12.9 million barrels of portland cement were shipped into Illinois from plants
outside the State, mostly from Indiana, Michigan, and Missouri. In addition,
534,000 barrels of masonry cement were imported from out-of-State plants,
principally from Indiana. 
 
Table 8.—Finished portland cement produced and shipped 
(Thousand barrels and thousand dollars) 
Year 
Active 
plants 
Produc- 
tion 
Shipped 
 
Quantity 
from mills 
 
Value 
1963                                                 
1964                                                 
5 
4 
9,465 
9,978 
9,281 
9,790 
$30,577 
32,191 
1965                                                 
1966                                                 
1967                                                 
4 
4 
4 
9,235 
9,108 
9,608 
9,358 
9,203 
9,069 
30,622 
28,617 
30,186 
 
 Over 2.7 million tons of limestone and 418,000 tons of other raw materials,
including clay and shale, gypsum, iron ore, sand, slag, air-entraining compounds,
and grinding aids were used in manufacturing portland cement. About 272.5
million kilowatt-hours of electricity was used in the manufacturing process;
nearly 63 percent was purchased, while the remainder was home-generated.

 Clays.—Total production of fire clay and miscellaneous clay and shale
declined 
nearly 1 percent in quantity and 5 percent in value. The production of fire
clay used in refractories increased over 1 percent, while that for heavy
clay products declined 16 percent. Miscellaneous clay and shale used in heavy
clay products increased 4 percent, while that used in lightweight aggregate
and cement declined about 3 percent. The production of fuller's earth for
absorbent uses increased 12 percent. 
 Production of clay and shale was reported from 20 counties. Fire clay was
pro-