135 
520 
370 
 272 37 302  4 13.25 172 
 211 110 896  14 15.62 594 
 241 89 772 1 13 18.14 8197 
 THE MINERAL INDUSTRY OF CONNECTICUT 217 
 
Table 3.—Indicators of Connecticut business activity 
 
1966 
1967 
Change, 
percent 
Personal income: 
 
 
 
   Total millions~   Per capita                                         
   Construction activity:   Construction contract thousand employees~   Cement
shipments to and     within Connecticut thousand 376—pound barrels.Mineral
production thousands..Employment:   Civilian work force thousands   Total
civilian employment do.   Unemployment percent of work force.   Manufacturing:
millions..      Durable goods do...      Non-durable goods do 
$10,621 
$3,690 
 
51.1 
 
4,322 
$21,346 
 
1,255 
1,215 
3.2 
$472 
$350 
$122 
P $11,306 
~ $3,865 
 
48.9 
 
P 3,695 
$20,619 
 
1,294 
1,246 
3.3 
$480 
$360 
$120 
+6.4 
±4.7 
 
—4.3 
 
—14.5 
—3.4 
 
±3.1 
±2.5 
 
±1.7 
±2.8 
—1.6 
P Preliminary. 
 
 Source: U.S. Department of the Interior, Bureau of Mines; U.S. Department
of Labor, Bureau of limployment Security; U.S. Department of Commerce. 
 
Table 4.—Employment and injury experience in the mineral industries

 Average  menYear and industry working 
Days 
Active 
Man- 
days 
worked 
Man- 
hours 
worked 
Number of 
injuries 
Injury rates per 
million man-hours 
daily 
 
(thou- 
sands) 
(thou- 
sands) 
Fatal Nonfatal 
Fre- Severity quency 
1966: 
Nonmetal and peat        
Sand and gravel 
Stone 
 177 286 50 413  8 19.37 395 
 555 233 130 1,053 1 24 23.73 6438 
 394 247 97 851  26 30.56 484 
 Total 1,126 246 277 2,317 1 58 25.46 3,175 
 
1967: P 
Nonmetal 
Sand and gravel 
Stone 
 Total 1,025 230 235 1,970 1 31 16.25 3,508 P Preliminary. 
 
 
REVIEW BY MINERAL COMMODiTIES 
NONMETALS 
 
 Cement.—There were no producers of ce~nent in Connecticut. Shipments
of portland cement into the State totaled about 3.7 million barrels; masonry
cement shipments totaled about 145,000 barrels. These figures reflect decreases
of approximately 14 and 4 percent respectlively, from shipments received
during 
1966. 
 
 Clays and Shaies.—Production of clays and shales decreased less than
1 percent from that of 1966; the unit value increased about 14 percent to
$1.75 per short ton. Four companies produced clays and shales from pits in
Hartford, Middlesex, and New Haven Counties. Most of the output was consumed
in the manufacture 
of brick. Smaller amounts were used for pottery. 
 
 Feldspar.—Three operations, one of which closed during the year, produced
ground feldspar in Middlesex County. Although total production declined about
5 percent from that of 1966, unit value increased. Most of the production
was sold to glass and ceramic manufacturers; a small quantity was used in
the manufacture of sweeping compounds. 
 
 Gem Stones.—Collection of gem s:tofles from mine dumps, quarries,
and peginatite deposits was done by mineralogical societies, dealers, and
individuals The total quantity cannot be determined, but was undoubtedly
small.