|Quadrangle map, 1:250,000-scale||LC|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Locality on a slope about 1,200 m north of South Currant Creek, west of Chigmit Mountains. This is locality 27 of Nelson and others (1985) and locality 29 of MacKevett and Holloway (1977). Sec. 30, T. 2 N., R. 25 W., of the Seward Meridian. Location is accurate to within 2.4 km.|
Geologic descriptionLimestone and diorite float boulders contain disseminated pyrite, magnetite, and chalcopyrite. Limestone has been slightly altered to skarn, calc-silicate veins cut diorite and granodiorite. Stream sediment samples yielded up to 220 ppm Cu, 500 ppm Zn, 0.4 ppm Au (Resource Associates of Alaska, 1976). The locality is in the vicinity of a contact between Tertiary medium-grained biotite-hornblende granodiorite unit (with some granite and quartz monzodiorite) and a Cretaceous granodiorite unit which ranges in composition from mafic tonalite to quartz diorite (Nelson and others, 1983; units Ti11 and Ki9).
|Geologic map unit||(-153.682206426218, 60.2393465243287)|
|Mineral deposit model||Cu skarn (Cox and Singer, 1986; model 18b)|
|Mineral deposit model number||18b|
|Age of mineralization||Intrusives associated with the skarn are Cretaceous to Tertiary.|
|Alteration of deposit||Limestone partially altered to skarn, chlorite alteration in diorite.|
|Workings or exploration||Stream sediment samples yielded up to 220 ppm Cu, 500 ppm Zn, 0.4 ppm Au (Resource Associates of Alaska, 1976).|
|Indication of production||None|
|Reserve estimates||No reserves|
|Production notes||No production|
Additional commentsSite is in Lake Clark National Park and Preserve.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, 1 sheet, scale 1:250,000.
Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
|Reporters||M.L. Miller (USGS); D.P. Bickerstaff (USGS)|
|Last report date||6/15/1998|