' Includes molding, filter, grinding and polishing, and other sand.2 Includes
railroad ballast (1967), miscellaneous, and other gravel218 
MINERALS YEARBOOK, 1967 
 
 Gypsum.—National Gypsum Co., the State's only producer of gypsum,
imported the crude gypsum supply from out-of-State sources and calcined the
mineral at the New Haven plant. The calcined gypsum was used in the manufacture
of building supplies. 
 
 Lime.—The Minerals, Pigments, & Metals Division of Charles Pfizer
& Co., Inc., produced quicklime and hydrated lime at its plant in Litchfield
County. The quicklime was used for the manufacture of chemicals. Hydrated
lime was used for construction and agricultural purposes. Production was
down slightly from that of 1966. 
 
 Mica.—Ground mica was produced as a byproduct at the Feldspar Corp.
plant in Middlesex County. The product was used chiefly in roofing material.~

 Sand and Gravel.—Commercial and Government-and-contractor production
of sand and gravel continued a decline which commenced in 1964. Total production
was 8.3 million tons, of which 6.6 million tons came from commercial operations.
Eighty-five percent of the commercial sand and gravel was processed, whereas
97 percent of the Government-and-contractor sand and gravel was processed.
Sand and gravel was produced in all of the State's eight counti~s with the
greatest production coming from Hartford County. There were 68 plants in
operation during the year, 60 stationary and eight portable. 
 
 Stone.—Production of stone declined both in quantity and value from
that of 1966. Basalt was the major source of crushed stone and accounted
for 84 percent of all stone produced. The average unit value of crushed basalt
rose 10 cents 
 
Table 5.—Sand and gravel sold or used by producers, by classes of operations
and uses 
(Thousand short tons and thousand dollars) 
Class of operation and use 
1966 
 
1967 
 
 
Quantity 
Value 
Quantity 
Value 
Commercial operations: 
 Sand: 
 
 
 
 
Structural                                      
Paving                                         
Fill                                            
1,823 
1,716 
183 
$2,071 
1,757 
 107 
1,707 
1,476 
393 
$2,063 
1,632 
236 
 Other 1                                       Total                    
                       
 
Gravel: 
285 
286 
317 
339 
 
4,007 
4,221 
3,893 
4,270 
 
 
 
 
 
Structural                                      
Paving                                         
Fill                                           
1,412 
882 
541 
2,202 
1,072 
260 
1,288 
794 
407 
2,316 
981 
210 
 Other 2                                        Total                   
                       Totalsandandgravel                               
 
Government-and-contractor operations: 
Sand: 
Paving                                         
Other                                          
 
Total                                            
 
Gravel: 
162 
199 
236 
278 
 
2,997 
3,733 
2,725 
3,785 
 
7,004 
7,954 
6,618 
8,055 
 
102 
27 
37 
13 
194 
40 
73 
25 
 
129 
50 
234 
98 
 
 
 
 
 
Paving                                        Fill                      
                    
 
Total                                            
 
 Total sand and gravel  All operations: 
Sand                                              
Gravel                                            
 
Total                                            
2,362 
66 
916 
43 
1,374 
94 
499 
58 
 
2,428 
959 
1,468 
557 
 
2,557 
1,009 
1,702 
655 
 
4,136 
5,425 
4,271 
4,692 
4,127 
4,193 
4,368 
4,342 
 
9,561 
8,963 
8,320 
8,710