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Porcupine

Occurrence, Inactive

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Alternative names

Porcupine Gold Mining Co.

Commodities and mineralogy

Main commodities Au
Other commodities Pb; Zn
Ore minerals arsenopyrite; galena; gold; pyrite; pyrrhotite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-7
Latitude 60.3298
Longitude -149.4002
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 setting

Geologic description

The 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.

Production and reserves

Workings or exploration There are no workings or improvements and no assay results reported in the literature.
Indication of production None

Additional comments

Jansons 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.

References

References

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.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 1/10/2001