|Quadrangle map, 1:250,000-scale||CV|
|Quadrangle map, 1:63,360-scale||D-8|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is at the 500 foot elevation about 0.5 mile west of Turner Lake. It is in the E1/2 sec. 16, T. 11 S., R 8 W., of the Copper River Meridian. The location is accurate to within 2000 ft. This prospect is shown as #5 in Cobb (1972: MF-392) and as C-90 in Jansons and others (1984).|
Geologic descriptionThe country rocks at this prospect are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of lenses of quartz, chalcopyrite, malachite, and sphalerite in a shear zone in graywacke near the contact of mafic volcanic rock (Cobb, 1979; OFR 79-973).
|Geologic map unit||(-146.642013977917, 60.9194590357134)|
|Mineral deposit model||Cyprus massive sulfide (Cox and Singer, 1986; model 24a)|
|Mineral deposit model number||24a|
|Age of mineralization||Probably Tertiary based on the age of the host rocks.|
|Alteration of deposit||Local oxidation of sulfides.|
|Workings or exploration||One 70 foot tunnel reported by Cobb (1979: OFR 79-973) that could not be located in the early 1980s (Jansons and others, 1984).|
|Indication of production||None|
Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.
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.
Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska--Reply: Economic Geology, v. 88, p. 1285-1288.
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.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.
|Reporters||S.W. Nelson, Anchorage, AK|
|Last report date||6/10/2000|