|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||D-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The prospect is located in the SE1/4 section 13, T. 8 N., R. 2 W., of the Seward Meridian It is at an elevation of 3,200 feet, just north of a small lake and about a mile northeast of the Hirshey-Lucky Strike mine (SR011). This is location 11 of Cobb and Richter, (1972), location 10 of MacKevett and Holloway (1977), location 23 of Cobb and Tysdal (1980), and location S-290 of Jansons and others (1984). The location is accurate to within a quarter of a mile.|
Geologic descriptionThe deposit is in a fractured Eocene(?) felsic dike that strikes N15E and dips 65SE. Fractures in the dike are filled with quartz-calcite veins containing arsenopyrite, chalcopyrite, galena, sphalerite, and minor gold. In some parts of the dike, quartz may be absent; in other parts it may constitute as much as 30 percent of the dike. The width of the dike varies from 1 to 8 feet. It averages 2.5 feet wide and is traceable for as much as 4 miles along strike (Tuck, 1933). The dike is commonly offset by right-lateral transverse faults having typical displacements of less than 20 feet. The dike is hosted by slate and graywacke of the Upper Cretaceous Valdez Group (Tysdal, 1978 [MF-880-A]).
|Geologic map unit||(-149.538057380938, 60.7801237041963)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Eocene or younger; the dike is probably Eocene in age.|
|Workings or exploration||
The workings on this prospect consist of a single adit that is 65 feet long and surface trenching. There are no buildings or equipment of any kind on the property (Tuck, 1933). Tuck (1933) collected five channel samples across the dike in what appeared to be the most promising parts. These samples assayed only traces of gold and silver. Nevertheless, Tuck (1933) reported that small flakes of free gold could commonly be seen in the vein material in the dike.The U.S. Bureau of Mines collected a chip sample and a grab sample of the dike in 1982. The chip sample assayed a trace of gold and silver. The grab sample assayed 0.117 ounce of gold per ton and 0.2 ounce of silver per ton (Jansons and others, 1984). The Bureau suggested that large reserves are possible but that the grade appears to be less than 0.05 ounce of gold per ton.
|Indication of production||None|
|Reserve estimates||The U.S. Bureau of Mines speculated that large reserves are possible but that the grade appears to be less than 0.05 ounce of gold per ton (Hoekzema and Sherman, 1983).|
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000.
Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 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.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Tuck, Ralph, 1933, The Moose Pass-Hope district, Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 849-I, p. 469-530.
|Reporters||Jeff A. Huber (Anchorage)|
|Last report date||4/29/2000|