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Nelchina area, Alaska, showing igneous rocks and
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sctile 1;96,000.
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Nelchina area, south-central Alaska: U.S. Geo-
logical Survey open-file report, scale 1:65,360, 4
sheets.
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0 10 20 KILOMETERS
Stmchmtl relations and fluiMnchrsion data for
mineralized md olbnmineralized qarb veins in the
Port Valdez gold dbtrict, VaLdeg qundraqk, southern
Alaska
By William J. Picklhorn and Miles L. S~lbetman
The Port Valdez district is one of several gold
districts, lncluBing the Port Web, Girdwood, Hope-
Sunrise, Moose Pass, and Nuka Bay, located within the
Valdez Qroup around Prince William Sound. The gold
occurs In epigenetic hydrothermal quartz veins, a few
of which have been mined on a smaLl 8cale. Total
production for the district is probably less than
100,000 troy oz (Berg and Cobb, 1967). At its peak of
activity, the district comprised a belt more than 40 krn
long from the westernmost occurrence at Columbia
Glacier to east of Valdez Glacier, and more than 12
km wide from the shore of Port Valdez to beyond the
head of Mineral Creek (area 14, fig. 44; fig. 54).
Brooks (1912) considered that these limits of minerel
occurrence were determined only by accessibility and
exposure and that the district should be considered a
geographic rather then a geologic province.
The Valdez Group, dominantly graywacke, argilllte,
slate, and minor greenstone, is the major component
of the Chugach terrane (Plafker and others, 1977;
Winkler and others, 1981). This terrme was juxtaposed
against the North American Continent during Late
Cretaceous and (or) early Tertiary time (~acKevet t
and Plefker, 1974). Penetrative deformation during
accretion resulted in tight folding of the rocks and
Figure 54.-4eneralized geologic map showing approximate location of indivtdual mines in Port Valdez gold
district (Cobb and Matson, 1972; Winkler md others, 1981).