Hannum

Prospect in Alaska, United States with commodities Lead, Zinc, Arsenic, Barium-Barite

Geologic information

Identification information

Deposit ID 10001889
MRDS ID A012715
Record type Site
Current site name Hannum

Geographic coordinates

Geographic coordinates: -163.32148, 65.92047 (WGS84)
Relative position The Hannum prospect is on the west bank of the headwater part of Hannum Creek, 1,000 feet upstream of the confluence with Cunningham Creek. Hannum Creek is a north tributary to Inmachuk River. This is locality 8 of Cobb (1972; MF 417; 1975; OFR 75-429).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Zinc Primary
Arsenic Secondary
Barium-Barite Secondary

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Arsenopyrite Gangue
Barite Gangue
Calcite Gangue
Limonite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Development of silica-rich rock is characteristic. The deposit is deeply weathered and oxidized.

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Early Devonian
    Stratigraphic age (oldest) Neoproterozoic

Nearby scientific data

(1) -163.32148, 65.92047

Comments on the geologic information

  • Geologic Description = A poorly exposed, interlayered metasedimentary schist and dolomitic marble sequence strikes northwest and dips moderately (15 to 65 degrees) to the north in the general area. Part of this meatsedimentary sequence is siliceous and described as quartzite (Herried, 1966). Herried considers the quartzite here and at Harrys Creek (BN055), 4,000 feet to the northwest, to be replacements of marble (silicified marble). Hudson and others (1977) described outcrops of the silica-rich rock on Harrys Creek as siliceous schist. The frozen ground in the Hannum prospect area has handicapped efforts to expose bedrock (Mulligan, 1965; Herreid, 1966). Although dozer trenching along the west bank of Hannum Creek is extensive (totalling about 1,500 feet in at least 6 different trenches) mineralization was only locally exposed; a 30 foot-wide gossan zone within marble is exposed in one trench. Mineralization is apparently pods and stringers of sulfides (primarily galena, sphalerite and pyrite) in silica-rich rock. An assay of a 6-foot wide siliceous zone contained 0.05 % Cu, 0.38 % Zn, and 0.12 % Pb, and nil amounts of Ag and Au (Herried, 1966, Table 1). Soil samples collected upslope 125 to 375 feet to the west, contained anomalous lead and zinc values (to greater than 1,000 ppm); soil samples in this prospect area commonly contain more anomalous zinc than lead values (Herreid, 1966, Table 2). Although continuity of mineralization over the 4,000 feet of strike length between the Hannum prospect and Harrys Creek (BN055) to the west is possible, it has not been demonstrated.
  • Age = The deposit may be epigenetic and younger than the host metasedimentary rocks. Epigenetic deposits on Seward Peninsula are primarily Cretaceous in age, a time of significant regional metamorphism and granitic plutonism. The Inmachuk River and many of its tributaries, including Cunningham and Hannum Creeks, contain signficant placer gold deposits. Some lode gold deposits on southern Seward Peninsula are mid-Cretaceous in age (see Midnight Mountain, BN047). If the deposit is stratiform, it may be similar in age to its host sedimentary rocks. The protoliths for the metasedimentary rocks in this area are lower Paleozoic in age (Till and others, 1986).
  • Age = Similar host rocks in this area are Silurian - Cambrian.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active?

Mining district

District name Fairhaven

Comments on the workings information

  • Workings / Exploration = Dozer trenching along the west bank of Hannum Creek is extensive; it totals about 1,500 feet in at least 6 different trenches. Mineralization was only locally exposed; a 30 foot-wide gossan zone within marble is exposed in one trench.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012715
USGS Alaska Resource Data File ARDF BN056

Bibliographic references

  • Deposit

    Herried, G.H., 1965, Geology of the Omilak-Otter Creek area, Bendeleben quadrangle, Alaska: Alaska Division of Mines and Minerals Geological Report 11, 12 p.

  • Deposit

    Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.

  • Deposit

    Hudson, T.L., Miller, M. L., and Pickthorn, W. J., 1977, Map showing metalliferous and selected nonmetalliferous mineral deposits, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 77-796-B, 46 p., one sheet, scale 1:1,000,000.

  • Deposit

    Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.

  • Deposit

    Mulligan, J.J., 1965, Examination of the Hannum lead prospect, Fairhaven district, Seward Peninsula, Alaska: U.S. Bureau of Mines Open-File Report 6-65, 16 p.

Comments on the references

  • Primary Reference = Herried, 1966

General comments

Subject category Comment text
Deposit Model Name = Sulfide-bearing pods and disseminations in silica-rich metasedimentary rocks; it is not clear whether this is a recrystallized stratiform deposit or an epigenetic deposit much younger than its host rocks

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-1999 Travis L. Hudson Applied Geology