THE M~N~RAL INDUSTRY OF MINNESOTA 
439 
 
 Perlite.—Minnesota Perlite Corp. and Zonolite Division, W. R. Grace
& Co., produced expanded perlite at plants in Hennepin County from crude
material mined outside the State. The expanded product was used for building
plaster, concrete aggregate, insulation, texture, and horticultural purposes.
Production decreased both in quantity and value. Minnesota Perlite Corp.
discontinued production in May 1967. 
 
 Sand and Gravel.—Minnesota sand and gravel output set a record high
in 1967 of 41.2 million tons valued at $33.1 million. This represented an
increase of 5 percent in quantity and 14 percent in value over the previous
record set in 1966. Major reason for the gain was an increase of 1.4 million
tons of material used for 
road construction. Sand and gravel for building increased 5 percent in quantity
and 9 percent in value. Total sales of industrial sand used for foundry,
engine, blast, filler, oil (hydrafrac), pottery, glassmaking, porcelain,
molding, tile, and other purposes increased 6 per~ent in quantity and 11
percent in value. About 75 percent of the sand and gravel production was
used for paving, 17 percent for building, and 6 percent for fill. Average
value of sand and gravel in 1967 was $0.80 per ton compared with $0.74 in
1966. Sand and/or gravel was produced in 86 of the 87 counties in the State.
Counties with production exceeding 1 million tons, in descending order of
production, were Hennepiri, Dakota, St. Louis, Washington, Stearns, and Clay.
Collectively these six counties accounted for 40 percent of all 
 
Table 13.—Production of sand and gravel in 1967, by counties 
(Thousand 
short ton 
s and thousand dollars) 
 
 
County Quantity 
Value 
County 
Quantity 
Value 
Aitkin 450 
Anoka W 
$303 W 
Meeker                   
MilleLacs                
217 
128 
$205 W 
Becker 556 
W 
Morrison                 
399 
280 
Beltrami 171 
103 
Mower                   
357 
183 
Benton 236Big Stone 284Blue Earth 623 
200 W 
526 
Murray                  
Nicollet                  
Nobles                   
184 
795 
326 
W W 
203 
Brown 186 
W 
Norman                  
125 
71 
Carlton 357 
W 
Olmsted                  
318 
W 
Carver 470 
W 
Otter Tail                 
470 
W 
Cass 315Chippewa 412Chisago 510Clay 1,282Clearwater 213Cook 201Cottonwood
301 
W 
329 
257 W 
138 
128 
W 
Penningeon                
Pine                     
Pipestone                 
Polk                     
Pope                    
Ramsey                  
Red Lake                 
66 
383 
393 
637 
315 
541 
54 
42 
228 
193 W 
249 
531 
41 
Crow Wing 190Dakota 3,283Dodge WDouglas 831Faribault 109 
182 
W 
W 468 
101 
Redwood                 
Renville                  
Rice                     
Rock                    
Roseau                   
550 
480 
558 
710 
228 
W 
W 
W 
W 123 
Fillmore 99Freeborn 599Goodhue 107Grant 404Hennepin 4,798Houston        
                     Hubbard 10Isanti WItasca 663Jackson 60Kanabec 166Kandiyohi
582Kittson 86Koochiching 181Lac qui Parle 168Lake 455 
65 
368 
W 
197 
W 
 
6 
W 
345 
47 
132 
640 
53 
141 
W 
242 
St. Louis                 
Scott                    
Sherburne                 
Sibley                   
Stearns                   
Steele                    
Stevens                  
Swift                    
Todd                    
Traverse                 
Wabasha                 
Wadena                  
Waseca                  
Washington               
Watonwan                
Willdn                   
2,896 
461 
307 
122 
1,305 
445 
137 
201 
182 
W 
97 
121 
W 
2,803 
12 
292 
2,116 
415 
308 
132 
W 
W 
115 
115 
98 
W 
W 
W 
W 
W 
 6 
150 
LakeoftheWoods 467Le Sueur 883Lincoln 278Lyon 222McLeod 310 
292 
1,437 
173 
202 
312 
Winona                  
Wright                   
Yellow Medicine            
Undistributed 1               
 W 
434 
187 
1,164 
 W 
 290 
 W 
19,438 
Mahnomen WMarshall W 
W 
W 
Total               
41,212 
33,132 
Martin 294 
213 
 
 
 
W Withheld to avoid disclosing individual company confidential data; included
with "Undistributed." ' Includes production for which no county breakdown
is available, and data indicated by symbol W.