here - State of Arizona Department of Mines and Mineral Resources

in the Keystone mine probably yielded most of the
gold of the district. Veins containing pyrrkotite,
chalcopyrite, and gold were worked for copper,
silver, and gold (Osterwald and Osterwald, 1952,
p.64-66).
FREMONT COUNTY
The Atlantic City-South Pass district is in southern
Fremont County at the southeast end of the
Wind River Range, about 23 miles south of Lander.
Most of the gold produced in Wyoming came from
this district. The estimates of the gold output of
the district vary considerably. Spencer (1916, p. 27­
28) estimated the output to 1915 at about $1 million
(72,500 ounces). Armstrong (1948, p. 37), using
Spencer's figures, estimated the total gold production
of the district to May 1947 at about $2 million
(about 86,000 ounces), but Martin (1954, p. 1618)
credited all Wyoming through 1951 with only 80,040
ounces. Considering the output from other areas in
Wyoming, the gold production of the Atlantic City­
South Pass district through 1959 probably was not
more than 70,000 ounces.
Though placer gold was discovered as early as
1842, important mining operations did not begin
until after the Cariso lode was found in 1867 (W. C.
Knight, quoted by Trumbull, 1914, p. 76-82).
Through 1874 the district produced about $735,000
in gold (Henderson, 1916, p. 248), but production
declined sharply thereafter, because of the exhaustion
of the rich oxidized ores near the surface.
Intermittent exploration in more> recent years resulted
in only minor production (Armstrong, 1948,
p.35-37).
The bedrock of the Atlantic City-South Pass district
consists chiefly of isoclinally folded and faulted
schists, gneisses, granulite, amphibolite, diorite, and
granodiorite, all of Precambrian age (Armstrong,
1948, p. 11-34). Gold-bearing veins have been found
in fault zones in all varieties of the country rock
(Armstrong, 1948, p. 37-42). They occur in an en
echelon pattern in zones as much as 1,000 feet long.
The ore-bearing veins are mostly 2 to 6 feet wide,
but they may be as much as 12 feet wide and 50 feet
long. The unoxidized ore minerals consist of pyrite,
arsenopyrite, and local chalcopyrite and galena
(Spencer, 1916,p.28-34).
SELECTED BIBLIOGRAPHY
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Adams, G. I., Butts, Charles, Stephenson, L. W., and Cooke,
Wythe, 1926, Geology of Alabama: Alabama Geol. Survey
Spec. Rept. 14, 312 p.
WYOMING 263
Allen, A. W., ed., 1931, Gold mining and milling at Lead,
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Allen, R. M., Jr., 1951, Structural control of some golil-base
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Allsman, P. T., 1940, Reconnaissance of gold-mining districts
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