232 
MINERALS YEARBOOK, 1967 
 
with washing and sizing section, a flotation plant, a 200,000-ton wet-rock
storage facility, a fluid-solids drying system, and a 10,000-ton dry-rock
facility. The fluid-solids drying system is designed to handle 300 tons per
hour of phosphate rock to produce a dried product of less than 1.5 percent
moisture. 
 
 Sand and Gravel.—Sand and gravel output was 6.9 million tons valued
at $6.5 million in 1967; output declined 7 percent, but value increased 1
percent. Of the total tonnage, 95 percent was produced by commercial operators
and 5 percent by Government-and-contractor producers. There were 42 commercial
sand and gravel operations during the year; of these, 11 produced 200,000
to 600,000 tons; 18 produced from 50,000 to 200,000 tons; and 13 plants produced
up to 50,000 tons. Of the output, 68 percent 
was transported by truck and 32 percent by rail. The sand and gravel was
used mainly for construction purposes, with a small amount going into industrial
uses. The value per ton of commercial sand and gravel ranged from $0.62 to
$7.46 and averaged $0.94 per ton. A new sand deposit of Polk City Sand and
Silica Co. was described.4 
 
 Staurolite.—Staurolite was recovered as a byproduct of ilmenite production
by E. I. du Pont de Nemours & Co., Inc., at its~ Highland and Trail Ridge
plants in Clay County. Output and value both decreased 8 percent from 1966
figures. Florida is the only State with recorded production of staurolite.

 
 4 McDonough, E. W. Huge Sand Deposit Unearthed by Polk City Sand and Silica
Co. Dixie Contractor, v. 42, No. 2, May 5, 1967, pp. 31—32. 
 
Table 5.—Sand and gravel sold or used by producers, by counties 
(Thousand short tons and thousand dollars) 
County 
 
 
1966 
 
 
1967 
 
 
Number 
of mines 
 
Quantity 
Value Number of mines 
 
Quantity 
Value 
Baker 
 
 
 
1 
 
11 
$9 
Brevard              
 
1 
27 
 $27 1 
 
24 
25 
Broward              
4 
 
469 
 838 4 
 
321 
324 
Escambia             
 
5 
426 
397 
5 
468 
437 
Gadsden              
1 
 
238 
W 
1 
241 
W 
Glades.               
 
1 
154 
W 
1 
W 
W 
Hendry               
Indian River           
1 
1 
 
205 
20 
W 
19 
1 
1 
W 8 
W 7 
Lake                 
Marion               
5 
1 
 
1,588 
 11 
1,124 
 32 
5 
1 
1,496 
 11 
1,083 
 32 
Orange.               
PalmBeach            
1 
1 
 
135 
130 
93 
72 
1 
1 
151 
84 
104 
68 
Pinellas.              
1 
 
7 
5 
1 
7 
5 
Polk                 
Putnam              
 
8 
4 
2,076 
526 
1,886 
461 
8 
5 
2,065 
626 
1,983 
476 
St. Lucie              
 
3 
W 
W 
2 
84 
W 
Wakulla              
 
1 
80 
68 
 
 
 
Washington           Undistributed 1         
 
Total           
1 
10 
 
13 
1,298 
 12 1 1,883 7 
 
 8 
1,307 
 6 
1,920 
 
50 
 
7,403 
 6,417 47 
 
6,912 
6,479 
 ' I,~T Withheld to avoid disclosing individual company confidential data;
included with "Undistributed." 1 Includes Bay, Clay, Dade, Hillsborough,
Leon (1966), \Tolusia, and Walton Counties, and counties indicated by symbol
W.