|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||B-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The occurrence is located about 1.5 miles from the mouth of Porcupine Creek near its junction with Primrose Creek. It is in the SE1/4 section 23, T. 3 N., R. 1 W., of the Seward Meridian. This is location 80 of Tysdal (1978 [MF-880-A]) and location S-215 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
Geologic descriptionThe occurrence consists of quartz-calcite veins within and parallel to a shear zone in slate and sandstone of the Valdez Group of Late Cretaceous age (Cobb and Tysdal, 1980; Nelson and others, 1985). The veins strike N23E and dip 80E; they are from 6 to 9 inches wide (Martin and others, 1915). The minerals include arsenopyrite, galena, pyrite, pyrrhotite, and sphalerite; native gold is also present.
|Geologic map unit||(-149.402354077822, 60.3292391373705)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.|
|Workings or exploration||There are no workings or improvements and no assay results reported in the literature.|
|Indication of production||None|
Additional commentsJansons and others (1984) and Tysdal (1978 [MF-880-A]) described the site as being on Porcupine Creek. Martin and others (1915) identified this creek as Porcupine Creek. The 1994 USGS B7 topographic map has labeled this creek Primrose Creek, but the USGS B7-SE topographic calls it Porcupine Creek.
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.
Martin, G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.
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.
Smith, S.S., 1917, The mining industry in the Territory of Alaska during the calendar year 1915: U.S. Bureau of Mines Bulletin 142, 65 p.
Smith, S.S., 1917, The mining industry in the Territory of Alaska during the calendar year 1916: U.S. Bureau of Mines Bulletin 153, 89 p.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||1/10/2001|