|Quadrangle map, 1:250,000-scale||LC|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Locality is the top of peak 5,251, south of Copper Mountain, roughly 6 km N-NW of the mouth of Ospook Creek. This is locality 33 of Nelson and others (1985) and locality 32 of MacKevett and Holloway (1977). Sec. 11, T. 1 N., R. 27 W., of the Seward Meridian. Location is accurate within 1.6 km.|
Geologic descriptionGreenstone, metasediments and volcanic flows (?), are intruded by a Tertiary medium-grained hornblende-biotite granodiorite. The rocks are hornfelsed near intrusive contact. Fractures in the greenstone near intrusive contact contain malachite and chalcopyrite. Quartz veins containing epidote, chalcopyrite, and malachite cut intrusive rocks near contact also. One of five chip samples of greenstone assayed 910 ppm Cu and 4.3 ppm Ag. A sample from a quartz-epidote-chalcopyrite-malachite vein yielded up to 22 ppm Ag, 1.0 percent Cu, and 250 ppm Zn (Resource Associates of Alaska, 1976).
|Geologic map unit||(-153.932199645412, 60.1893408819389)|
|Mineral deposit model||Porphyry Cu? or Polymetallic vein? (Cox and Singer, 1986; models 17? or 22c?)|
|Mineral deposit model number||17? or 22c?|
|Age of mineralization||Tertiary or younger.|
|Alteration of deposit||Chlorite and epidote in shear zones|
|Workings or exploration||One of five chip samples of greenstone assayed 910 ppm Cu and 4.3 ppm Ag. A sample from a quartz-epidote-chalcopyrite-malachite vein yielded up to 22 ppm Ag, 1.0 percent Cu, and 250 ppm Zn (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., 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|