|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||A prospect that possibly corresponds to the Snowstrike reportedly is in an east-west drainage on the east side of the West Fork Maclaren River at an elevation of 3,400 feet about 2,000 feet east of the center of section 15, T. 19 S., R. 5 E., Fairbanks Meridian (Kaufman, 1964). Kaufman's location corresponds approximately to locality 14 in figure 4 of Cobb (1979 [OFR 79-238]) and locality 9 of MacKevett and Holloway (1977). Kurtak and others (1992) reported mineralization in this drainage between 3,700 and 4,800 feet (locality A17). The Kardex site number is KX68-193 (Heiner and Porter, 1972).|
The rocks at the prospect are andesitic to basaltic greenstone of possible Triassic age; a narrow dike of quartz hornblende diorite cuts the greenstone about 100 feet below the prospect (Kaufman, 1964, p. 8). Limestone is reported nearby (Saunders, 1961).
Azurite and malachite occur as irregular surface coatings for a distance of about 100 feet on the north side of the east-west creek. These minerals formed from the oxidation of chalcopyrite and bornite in quartz-calcite-epidote veins in fractures that cut greenstone. One set of mineralized fractures strikes north-south and is nearly vertical (Kaufman, 1964). The veins are widely separated and no more than several inches thick. Saunders (1961 [report for 1961]) reported an occurrence of massive magnetite nearby, probably in a limestone host.Apparently Kurtak and others (1992) prospected vertically above Kaufman's locality. They reported limonite-stained metabasalt on the cirque wall near the top of the canyon. Quartz-rich float boulders contained as much as 0.12 percent copper.
|Geologic map unit||(-146.751668921287, 63.2673632545963)|
|Mineral deposit model||Copper-bearing veins in intermediate to mafic volcanic rocks. Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||Epigenetic (Mid-Cretaceous?) copper occurrences in Triassic (?) andesite and basalt|
|Workings or exploration||The area was prospected, and at least one claim (Snowstrike) was located. It was subsequently studied by the State of Alaska (Saunders, 1961 [report for 1961]; Kaufman, 1964) and the U.S. Bureau of Mines (Kurtak and others, 1992).|
|Indication of production||None|
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p.
Kaufman, M.A., 1964, Geology and mineral deposits of the Denali-Maclaren River area, Alaska: Alaska Division of Mines and Minerals Geologic Report 4, 15 p., 1 sheet, scale 1:125,000.
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.
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.
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||7/30/2001|