|Quadrangle map, 1:250,000-scale||HE|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is at an elevation of about 2,700 feet on the southeast flank of Lookout Mountain, approximately 0.4 mile south-southeast of the top of the mountain. This site is located in sec. 36, T. 19 S., R. 10 W., of the Fairbanks Meridian. The location is accurate within 1,000 feet. This is locality 13 of Cobb (1978: OFR 78-1062).|
Geologic descriptionThe country rocks in the prospect area are Upper Jurassic to Upper Triassic crystal tuff, argillite, graywacke and chert (Wilson and others, 1998). The strata are intruded by Upper Cretaceous or Lower Tertiary quartz porphyry and felsite. The deposit consists of argentiferous galena and sphalerite along fractures in a shear zone, in pipe breccias, and as disseminations in quartz porphyry. Scattered outcrops suggest that the quartz porphyry and felsite underlie an area about 1200 feet in diameter. Sulfides also are reported in breccia zones both in the intrusive and bedded rocks (Hawley and Clark, 1974). The breccias at Lookout Mountain are similar to those at the Golden Zone mine (HE043), but differ from then in containing more silver, lead, zinc, and tin.
|Geologic map unit||(-149.57228905145, 63.2215271947333)|
|Mineral deposit model||Polymetallic vein (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Late Cretaceous or younger, assuming that the deposit is related to the quartz porphyry and felsite.|
|Alteration of deposit||Minor sericitic-phyllic reported.|
|Workings or exploration||Limited surface work and sampling has been carried out on this prospect. The area has been covered by regional and detailed geophysical surveys.|
|Indication of production||None|
Balen, M.D., 1990, Geochemical sampling results from Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 sheets, scale 1:63,360.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-1062, 113 p.
Hawley, C.C., and Clark, A.L., 1974 (1975), Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. B1-B47, 2 plates, scale 1:12,000 and 1:48,000.
Hawley, C.C., and others, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska. Contract No. JO166107: U.S. Bureau of Mines Open-File Report 24-78, 274 p., 12 sheets.
Hawley, C.C., Clark, A.L., Herdrick, M.A., and Clark, S.H.B., 1969, Results of geological and geochemical investigations in an area northwest of the Chulitna River, central Alaska Range: U.S. Geological Survey Circular 617, 19 p.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
|Reporters||N. Van Wyck (Stevens Exploration Management Corporation)|
|Last report date||4/7/2000|