Table 16.—Clay production by counties 
 
County 
 
1966 
 
1967 
 
 
———— Short tons 
 — Value 
 - 
Short tons 
 
Value 
Bent                                             
Boulder                     
Custer                      
23,373 
857 
$43,033 
W 
173 
15,864 
W 
 
$868 
31,132 
W 
Douglas                     
Elbert                      
38,564 
W 
92,049 
W 
40,107 
W 
 
105,000 
W 
El Paso                     
Fremont                     
Huerfano                    
16,317 
11,829 
W 
W 
45,953 
W 
W 
33,396 
W 
 
W 
93,861 
W 
Jefferson                     
Las Animas                  
Pueblo                      
Undistributed                 
398,974 
11,456 
' 75,674 21,860 
586,009 
44,381 
' 386,276 117,600 
409,639 
W 
60,081 
37,238 
 
560,114 
W 
373,748 
108,976 
Total                  
' 598,904 
' 1,315,3f~ 
596,498 
 
1,273,699 — 
Revised 
W Withheld to avoid disclosing individual company confidential data; included
with "Undistributed." 
THE MINERAL INDUSTRY OF COLORADO 
203 
 
Corp. at its Valmont mill from crude ore obtained from the company's Burlington
mine in Boulder County. The fluorspar was used for making hydrofluoric acid.

 
 Gypsum.—The output of gypsum increased 2,000 tons, 3 percent above
the 1966 production. The increase was due to greater production at the Fibreboard
Corp. operation near ' Coaldale in Fremont County. The gypsum was sent to
the company's fiberboard plant at Florence. Although there were two fewer
producing operations in 1967 the decline in output resulting from these closures
was less than 1,000 tons. Ernest W. Monroe produced gypsum in Larimer County
for use as a portland—cement retarder; that produced by Colorama Rock
Products Co. in Chaffee County and U.S. Soil Conditioning Co. in Fremont
County was used for agricultural purposes. 
 
 Lime.—The output of lime declined 
8,000 tons, 6 percent below that of 1966. 
Two of the 15 lime producing facilities in 
1966 were not operated in 1967—the 
Windsor sugar plant of The Great Western Sugar Co. in Weld County and the

Sugar City sugar plant of The National 
Sugar Manufacturing Co. in Crowley 
County. 
 The Great Western Sugar Co. produced lime for sugar refining at its plants
in Brighton (Adams County), Eaton (Weld County), Fort Morgan (Morgan County),
Greeley (Weld County), Longmont (Boulder County), Loveland (Larimer County),
Ovid (Sedgwick County), and Sterling (Logan County). Lime was produced also

for sugar refining by Holly Sugar Corp. at its Delta plant in Delta County
and by American Crystal Sugar Co. at its Rocky Ford plant in Otero County.
CF&I Steel Corp. produced lime at its Pueblo steel plant for use as a
refractory material (dead-burned dolomite) and as a flux in the basic oxygen
method of steelmaking. 
 The only lime production that was not captive was by Basic Chemical Corp.
at ~ts plant in Garfield County and by Colorado Lime Co., Inc., at its plant
in El Paso County. Lime produced by Colorado Lime was sold for use in soil
stabilization and treatment of sewage and trade wastes. Output by Basic Chemical
was used for the same purposes and also for water treatment and metallurgical
processing. 
 
 Mica.—A small quantity of scrap mica was produced by Georgetown Lumber
& Timber Co. from the JBT mine in Clear Creek County. This was the first
mica produced in the State since 1963. 
 
 Perlite.—Persolite Products, Inc., the only producer of crude perlite
in Colorado, reported a tlight increase in output from its Rosita mine in
Custer County. Part of the production was sold and part sent to the company's
expanding plant in Florence. Crude perlite was also expanded at a plant in
Antonito by Grefco, Inc., and in Denver by W. R. Grace & Co. Expanded
perlite was used mostly for making building plaster, filter aids, loosefill
insulation, filler, and fire base; as a concrete aggregate; for soil conditioning;
and oil-well cementing.