Table 9.—Uranium (recoverable content U308), by counties 
 
County Number of oper- ations 
1966 
 
1967 
 
Pounds Value 
 Number1 of oper- ations 
Pounds Value 1 
 
65 
195 
72 
22 
616,372 
1,234,049 
577,065 
223,157 
$4,930,978 
9,872,390 
4,616,522 
1,785,256 
1 F.o.b. mill value; based on $8 per pound of UiOs contained in concentrate.

2 1966: Boulder (1 operation), Custer (1), Fremont (4), Garfield (3), Jefferson
(2), La Plata (1), Larimer (1), 
Montezuma (2), Park (1), Rio Blanco (3), Saguache (2), and San Juan (1);
1967: Fremont (4), Garfield (3), 
Jefferson (3), and Rio Blanco (2). 
192 
MINERALS YEARBOOK, 1967 
 
below that of 1966. Production at the Keystone mine was only half that of
1966. Two mines that had significant increases were the Brenneman in San
Juan County with a 59 percent gain and the Rico Argentine in Dolores County
with a 37 percent gain. The Brenneman mine was ranked sixth in production,
and the Rico Argentine, seventh. 
 Twenty-three counties, one more than in 1966, had silver production~ Chaffee,
Freniont, Huerfano, and Moffat Counties had production this year but not
last year; Custer, Lake, and Saguache had production last year but not this
year. The only counties with production exceeding 100,000 troy ounces, in
order of output, were San Miguel, San Juan, Eagle, Ouray, Gunnison, and Mineral.

 According to its annual report, Homestake Mining Co. decided to erect a
300ton-per-day mill and to place in production the Bulldog property, a silver-lead
prospect near Creede; underground development and metallurgical testing were
done during the year. 
 
 Tin.—Shipments of tin contained in concentrates declined 13 long tons
below those of 1966. The tin concentrates obtained by Climax Molybdenum Co.
from treating mill tailings at its Climax molybdenum operation were sold
to Fred H. Lenway & Co., Inc., for upgrading at its n~ili near Boulder.

 
 Tungsten.—The output of tungsten was below that of the previous year
due to a slight drop in shipments from the Climax mine. Tungsten concentrates
were produced as a byproduct from milling molybdenum ore by the Climax Molybdenum

 
Mesa 
Montrose 
San Miguel 
Other counties 2 
Co. Canyon Mining Corp. mined tungsten ore from the Eureka mine in Boulder
County. The only other output of tungsten ore was recovered by Colorado Tungsten
Corp. from the Beddig mine dump in Boulder County. 
 
 Uraniuin.—The Bureau of Mines changed its method of reporting uranium
production from short tons of ore and f.o.b. mine value to recoverable pounds
of uranium oxide (U308) and f.o.b. mill value. The comparisons of 1967 and
1966, shown in tables 1 and 9, were determined by using the new method. The
f.o.b. mill value for the 2 years was based on $8.00 per pound of U308. 
 Uranium production declined 114,000 pounds of U308, 4 percent below that
of 1966. The U308 was. recovered from 
615,585 tons of ore, averaging 0.22 percent. The ore was processed at uranium
mills of Union Carbide Corp. at Rifle and Uravan; Climax Uranium Co. Unit,
American Metal Climax, Inc., at Grand Junction; Cotter Corp. at Canon City;
Foote Mineral Co. at Shiprock, N. Mex.; and Atlas Corp. in Moab, Utah. 
 The mine output came from 262 operations in seven counties, compared with
354 
operations in 15 counties in 1966. Mont- 
rose County had the largest production, 37 
percent of the State output, and most of 
the operations, 156. 
 Uranium ore shipments were made by 52 operators, 17 less than in 1966. Four
operators each had output exceeding 100,000 pounds of U308 together they
accounted for 89 percent of the State's output. Nine operators had production
between 10,000 and 100,000 pounds; 15, between 1,000 and 10,000 pounds; and
24, 
 41 632,202 $5,057,621 
 156 943,895 7,551,160 
 53 530,826 4,246,611 
 12 430,399 3,443,187 
 Total 35~4 2,650,643 21,205,146 262 2,537,322 20,298,579