|Quadrangle map, 1:250,000-scale||TL|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Reed and others (1978, locality 34) locate this occurrence on a tributary to the Kichatna River, in the northwest quarter of Section 33, T. 26 N., R. 18 W., of the Seward Meridian, at about 4100 feet within the Denali National Park and Preserve.|
Disseminations of chalcopyrite, pyrite, pyrrhotite and other sulfides occur in narrow mineralized fracture fillings within the Kichatna stock, a composite stock of primarily olive-bearing pyroxene quartz monzonite (Reed and Nelson, 1980).
The Kichatna stock is one of the nine composite plutons (Tcp) within a 65-km-long belt described by Reed and Nelson (1980), that extends from Mt. Estelle in the southwest to Cascade Creek in the northeast. These Late Cretaceous/early Tertiary composite plutons intrude Mesozoic marine sedimentary rocks (KJs) and at one locale, in the upper West Fork of the Yentna River, crosscut the fault boundary between the Mesozoic strata and Paleozoic rocks, Pzus of Reed and Nelson (1980). Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from these plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992; Foley and others, 1997). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973).Also see TL020, TL023, TL052, and TL053.
|Geologic map unit||(-152.630242366683, 62.3074267549216)|
|Mineral deposit model||This occurrence does not specifically fit any of those defined by Cox and Singer (1986). It may be a variation of the Porphyry copper model (Cox and Singer, 1986; model 17?).|
|Mineral deposit model number||17?|
|Age of mineralization||Late Cretaceous/early Tertiary; mineralization is interpreted to be linked to the Kichatna stock, one of the Tertiary composite plutons mapped by Reed and Nelson (1980).|
|Workings or exploration||Reconnaissance mapping, stream silt and rock sampling are all that have been done here. Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from these plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992; Foley and others, 1997). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973).|
|Indication of production||None|
Additional commentsThis occurrence is located within the Denali National Park and Preserve.
Cobb, E.H., and Reed, B.L., 1980, Summaries of data on and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.
Foley, J.Y., Light, T.D., Nelson, S.W., and Harris, R.A., 1997, Mineral occurrences associated with mafic-ultramafic and related alkaline complexes in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 396-449.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Mertie, J.B., Jr., 1919, Platinum-bearing gold placers of the Kahiltna Valley, in Martin, G.C., and others, Mineral resources of Alaska, report on progress of investigations in 1917: U.S. Geological Survey Bulletin 692, p. 233-264.
Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, 1 sheet, scale 1:250,000.
|Reporters||Madelyn A. Millholland (Millholland & Associates)|
|Last report date||8/10/1998|