|Quadrangle map, 1:250,000-scale||CV|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||
This prospect is at the 500 ft. elevation in Fleming Creek about 2 miles north-northeast of the city of Cordova. It is in the E1/2 sec. 15, T. 15 S., R. 3 W., of the Copper River Meridian. Location is accurate to within 500 ft.This site is shown as location C-34 by Jansons and others (1984) and loc. 23 by Cobb (1972: MF-392; 1979: OF 79-973).
Geologic descriptionThis prospect consists of base-and precious-metal deposits in Tertiary Orca Group volcanic and sedimentary rocks (Nelson and others, 1985). The volcanic rocks in the prospect area are reported to be amygdaloidal basalts (Grant, 1910). The deposits comprise impregnations and replacements of sulfides, oxides, and native metals in country rock, scattered veins of quartz or sulfides, and irregular masses of sulfide.
|Geologic map unit||(-145.725172576907, 60.5664564780085)|
|Mineral deposit model||Cyprus massive sulfide (Cox and Singer, 1986; model 24a). See also Crowe and others (1992).|
|Mineral deposit model number||24a|
|Age of mineralization||Tertiary based on the age of the host rocks (Nelson and others, 1985).|
|Alteration of deposit||Surface alteration & extensive oxidation at depth (Grant, 1910).|
|Workings or exploration||12 adits examined in 1980 (Jansons and other, 1984). The main activity took place in 1905-1909 and 1917 (Cobb, 1979: OF 79-973).|
|Indication of production||None|
|Reserve estimates||Inferred reserves of 17,600 tons @ 0.64% Cu are reported by Jansons and others (1984).|
No production, although a sample of native copper from this site was displayed in 1909 at the Alaska-Yukon Exposition (Grant, 1910).Prospect site could not be located in 1986 during industry exploration (B. Ellis, personal commun., 2000). Site is on State of Alaska land.
Cobb, E.H., 1972, Metallic mineral resources map of the Cordova quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-392, 1 sheet, scale 1:250,000.
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Cordova quadragle, Alaska: U.S. Geological Survey Open-file Report OF 79-973, 73 p.
Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1992, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound region, south-central Alaska: Economic Geology, v. 87, no. 7, p. 1722-1746.
Grant, U.S., 1910, Mining and prospecting on Prince William Sound in 1909: U.S. Geological Survey Bulletin 442-D, p. 164-165.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
|Reporters||S.W. Nelson, Anchorage, AK|
|Last report date||6/10/2000|