138 MINERALS YEARBOOK

Prices of silver, copper, lead, and zinc, 19td8—3P~
Year
Silver
Copper
Lead
Zinc
Year
Silver
Copper
Lead
Zinc
1928          
1929          
 1930 -
Per fine ounce
$0. 585
.533
. 385
Per pound
$0. 144
.176
. 130
Per pound
$0. 058
* 063
.050
Per pound
$0. 061
.066
.048
1931          
1932          
Per fine
ounce
$0. 290
.282
Per pound
$0. 091
.063
Per
pound
$0. 037
.030
Per pound
$0. 038
.030
 Review by counties and districts.—The Cripple Creek district in 1932
produced $2,260,507 in gold compared with $2,385,769 in 1931. The Golden
Cycle 1,200-ton roast-amalgamation-cyanidation custom mill at Colorado Springs
was operated at the rate of 800 to 900 tons daily, principally on Cripple
Creek suiphotelluride ores. All Cripple Creek ores are treated at this mill.
During 1932 part of the 300-ton selective flotation mill added to the Golden
Cycle equipment in Névember 1929 was used intermittently to treat
custom gOld-silver ores from Boulder, Clear Creek, Gilpin, Lake, and Park
Counties, chiefly gold (silver-lead) ores from Park County from September
10 to the end of the year; the tails from the flotation machines went direót
into the cyanide circuit or to the roasters to burn the carbon in the American
ore. Producing mines and dumps in the Cripple Creek district included the
Acacia, Atlas, Buckeye, Cresson, Doctor-Jack Pot, El Paso, Elkton, Empire
Lee, Gold Dollar, Gold Pinnacle, Granite, Jerry Johnson, Pharmacist, Portland,
School Section, Stratton Estate, Strong, and United Gold Mines. The Cripple
Creek district has yielded $354,022,394 in gold from its discovery in 1891
to 1932, inclusive.
 San Juan County in 1932 produced $511,092 in gold, 339,965 ounces of silver,
1,031,000 pounds of lead, and 1,367,000 pounds of copper compared with $647,208
in gold, 430,793 ounces of silver, 1,250,505 pounds of copper, and 1,134,000
pounds of lead in 1931. The Sunnyside Mining & Milling Co. 1,000-ton
selective flotation mill at Eureka continued idle. The 550-tonS Shenandoah-Dives
selective flotation mill operated throughout the year on gold-copper-silver-lead
ore from the Mayflower group.
 The Durango lead bullion-copper matte smelter which closed November 1, 1930,
remained idle.
 No ores were marketed from Rico, Dolores County, but the St. Louis Smelting
& Refining Co. completed its 6,000-foot adit.
 In San Miguel County a small production was made from the mines at Ophir,
and lessees continued gouging operations in the SmugglerUnion mine at Telluride,
sold in 1929 for its salvage value. Clean-ups were made at abandoned mills
in the Telluride district. The Cimarron mine at Telluride was reopened.
 The King Lease on the upper workings of the Camp Bird mine, Ouray County,
continued to extract gold ore which was treated in the amalgamation-concentration
mill built by the leasing company at the upper adit, in Imogene Basin. Production
of small lots of highgrade gold-silver ore from the Trust-Ruby property at
Sneffels was continued. Other small producers in Ouray County were the American,
Banner American, Governor, and Valley View.