W Withheld to avoid disclosing individual company confidential data; included
with "Other."1 Includes oil (hydrafrac) (1967), engine, filtration, glass,
railroad ballast, and other construction sand.THE MINERAL INDUSTRY OF WISCONSIN

863 
 
Portland Cement Co.'s new plant at Charlevoix, Mich. 
 
 Clays~—Miscel1aneous clay or shale was produced in Dunn, Fond du Lac,
Manitowoc, Pierce, and Racine Counties. The entire output was consumed by
the five producing companies. Products manufactured, in decreasing order
of quantity of clay or shale used, were portland cement, building brick,
vitrified sewer pipe, and other heavy clay products. Production decreased
28 percent in quantity and 24 percent in value from that of 1966 mainly because
of decreased output of clay used in the manufacture of portland cement. Manitowoc
Portland Cement Co.. discontinued mining of clay at Manitowoc. 
 The Wisconsin Geological Survey began a study of the industrial potential
of certain Wisconsin clays. Exploratory drilling was conducted in western
Pierce and St. Croix Counties. 
 
 Lime.—Combined shipments of quicklime, which comprised about two-thirds
of the total lime shipments, and hydrated lime increased 4 percent in quantity
and 7 percent in value over those of 1966. About 71 percent of the total
production was for chemical and other industrial uses. Principal among these
uses, in decreasing order of tonnage, were paper manufacture, water purification,
steelmaking, copper ore concentration, sewage disposal, disinfectant, tanning,
food processing, abrasives, 
 
Table 5.—Sand and gravel sold or used by producers, by classes of operations
and uses 
(Thousand short tons and thousand dollars) 
1966 
Class of operation and use 
Quantity 
Value 
1967 
 
Quantity 
Value 
Commercial operations: 
Sand: 
 Building 3,925 
 Paving  2,889 Blast  W Pill  1,355 Molding  1,076 Other 1 193 
 Total 9,438 
 
Gravel: 
 Building 3,880 Paving 13,265 Railroad ballast W Fill 1,659 Other 224 
 Total 19,028 Totalsand and gravel 28,466 
 
Government-and-contractor operations: 
Sand: 
 Building 15 Paving 2,519 Fill 622 Other 162 
 Total 3,318 
 
Gravel: 
Building                                                   
 Paving 9,409 Fill 330 
 Total 9,739 Totalsandandgravel 13,057 
 
AU operations: 
 Sand 12,756 Gravel 28,767 
 Grand Total 41,523 
$3,279 
2,080 
W 
637 
2,953 
247 
4,301 
2,661 
37 
1,860 
995 
160 
$3,838 
1,924 
131 
1,005 
2,859 
202 
 
9,196 
10,014 
9,959 
 
3,436 
9,859 
W 
747 
120 
4,742 
16,115 
169 
1,655 
1 
4,180 
12,502 
101 
808 
1 
 
14,162 
22,682 
17,592 
 
23,358 
32,696 
27,551 
 
6 
1,257 
203 
71 
2,035 
472 
129 
949 
189 
54 
 
1,537 
2,636 
1,192 
 
.- 
5,710 
108 
4 
6,707 
499 
2 
4,015 
195 
 
5,818 
7,210 
4,212 
 
7,355 
9,846 
5,404 
 
10.733 
19,980 
12,650 
29,892 
11,151 
21,804 
 
30,713 
42,542 
32,955