716 
MINERALS YEARBOOK, 1967 
 
 The overall increase in value of nonmetals production, attributed mainly
to gains in stone, lime, sand and gravel, and feldspar, more than offset
the decreased values of portland cement, clays, gypsum, and mica 
 Two publications on resources of the 
State were released during the year.3 
 Employment and Injuries.—The extent of employment and injuries in
the mineral industry, exclusive of the petroleum industry is presented in
table 4. Information for 1966 represents final data; that given for 1967
is preliminary. 
 
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- Severity quency 
1966: 
 
 
 
 
 
 
Coal                      
Metal                     
Nonmetal                  
 4 
1,740 
259 
119 
306 
232 
(1) 
533 
60 
 4 
4,246 
489 
1 81 9 
19.31 2,26218.41 168 
Sand and gravel             
995 
170 
169 
1,421 
1 23 
16.89 4,922 
Stone                     
 
 Total 2                  1967: P 
389 
244 
95 
790 
16 
20.25 1,228 
 
3,387 
253 
858 
6,950 
2 129 
18.85 2,540 
 
 
 
 
 
 
 
Coal                      
5 
83 
(1) 
3 
 
 
Metal                     
1,695 
311 
528 
4,222 
114 
27.00 2,729 
Nonmetal                  
295 
211 
63 
519 
11 
21.21 137 
Sandandgravel             
Stone                     
 
Total 2                               
975 
465 
154 
227 
150 
105 
1,358 
894 
25 
15 
18.41 44516.78 302 
 
3,435 
246 
846 
6,995 
165 
23.59 1,782 
i Preliminary. 
 1 Less than 3/~j unit. 
 2 Data may not add to totals shown because of independent rounding. 
 
 Govermnent Programs.—The Office of Coal Research, U. S. Department
of the Interior, announced in April that Secretary Stewart L. Udall signed
an $8.5 million amendment to the contract with Consolidation Coal Co. (Consol),
a wholly owned subsidiary of Continental Oil Co., for further development
of lignite gasification through the construction of a pilot plant at Rapid
City. Plans for the facility were being developed by Consol at Library, Pa.
Construction is to begin in the fall of 1968 on 10 acres of land provided
by Rapid City Industries. 
 The Office of Minerals Exploration (OME) of the U.S Geological Survey loaned
$234,135 to Double Rainbow Mines, Inc., for exploration of silver-bearing
ore at its Double Rainbow mine near Galena. This loan, the only OME loan
made in South Dakota during the year, was for 75 percent of the cost. The
work was being done by Homestake Mining Co. 
 Highway construction contracts awarded during the year amounted to $48.3
million, 
an increase of $2 million over those of last year.4 The increase was for
contracts awarded for Interstate highway construction and for improvements
to meet standards adequate for present traffic. Contracts awarded for other
highway construction were essentially the same as those for 1966. As of December
31, 415.1 miles of Interstate highway in the State was open to traffice,
an increase of 38.4 miles from the corresponding date last year. Of this
total 18.1 miles was completed to full or acceptable standard; 20.3 miles
was improved to meet standards adequate for present traffic5 
 
3 U.S. Department of the Interior. Natural Resources of South Dakota. 1967,
72 pp. 
U.S. Department of the Interior and U.S. Department of Agriculture. Black
Hills Area Resources Study. February 1967, 225 pp. 
4 Engineering News-Record. State Highway Departments' Construction Contracting
Plans for 1968 . . . and Budgets for Maintenance: 
Highway Spending Goes for a New Record Despite Federal Aid Cuts. V. 180,
No. 14, 1968, pp. 86-87. 
5 Federal Highway Administration. Quarterly Report on The Federal-Aid Highway
Program, Dec. 13, 1967. Press Release FHWA—118, Feb. 14, 1968.