Tanner

Prospect in Alaska, United States with commodities Gold, Antimony

Geologic information

Identification information

Deposit ID 10100985
MRDS ID A012800
Record type Site
Current site name Tanner

Geographic coordinates

Geographic coordinates: -165.38829, 64.75818 (WGS84)
Relative position The Tanner prospect is in the canyon of Steep Creek, a tributary to Goldbottom Creek; it is at an elevation of about 650 feet, 0.9 mile south of Mount Distin. It is about 4,500 feet north-northeast of the junction of the road up Goldbottom Creek and a jeep trail that leads to this prospect and the McDuffee prospect (NM092). The Tanner prospect is locality 18 of Hummel (1962 [MF 248]) and is included with locality 23 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Primary

Comments on the commodity information

  • Gangue = mica (pale green)

Materials information

Materials Type of material
Gold Ore
Stibnite Ore
Ankerite Gangue
Calcite Gangue

Alteration

  • (Local) Development of ankerite (?) and pale-green mica .

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -165.38829, 64.75818

Comments on the geologic information

  • Geologic Description = The Tanner prospect is in the sheared contact zone between massive marble and underlying mica schist. Schistosity strikes east-west and dips 20 to 40 degrees to the north. The marble is locally stained yellow-brown and may contain some secondary ankerite or dolomite. A pale-green mica, possibly chrome-bearing, occurs in the ankeritic (?) zone. Boudins of stibnite occur in schistose marble within a few feet of the overlying massive marble. The maximum thickness reported for the stibnite masses was 6 inches (Anderson, 1947, p. 4). Stibnite-bearing material was hand picked, and specimens as much as 5 inches across are stockpiled at the site. It is not known if any material was shipped. Native gold can be panned from the stibnite-bearing zone.? the contact zone between schist and marble is exposed along Steep Creek. Immediately above the mineralized contact zone, a near-vertical, east-northeast-striking fault, downthrown to the north, contains crystalline calcite nearly 1-foot thick. Another fault with calcite veins is exposed in the Steep Creek canyon about 400 feet upstream from the Tanner prospect. The calcite veins are parallel to the gold-bearing quartz vein of the McDuffee prospect (NM092) about 500 feet downstream from the Tanner prospect.? Kennecott Exploration Company drilled a reverse-circulation hole into the marble-schist contact zone near the Tanner prospect in 1995. The drill hole intersected a mineralized interval about 50 feet thick near the base of the marble. The 50-foot zone contained more than 0.05 ounce of gold per ton and a had a maximum 5-foot intercept of greater than 0.10 ounce of gold per ton.? the marble at the Tanner prospect is probably in the younger part of the Nome Group, which has Proterozoic to early Paleozoic protoliths (Till and Dumoulin, 1994). The Nome Group underwent regional blueschist facies metamorphism in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Armstrong and others, 1986; Hannula and McWilliams, 1995). The blueschist facies rocks were recrystallized to greenschist facies or higher metamorphic grades in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Hudson and Arth, 1983; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Lode gold-antimony mineralization on Seward Peninsula is mostly related to the higher temperature metamorphism in the mid-Cretaceous (Apodoca, 1994; Ford, 1993 [thesis]; Ford and Snee, 1996; Goldfarb and others, 1997).
  • Age = Probably mid-Cretaceous or younger; appears to postdate regional metamorphism of mid-Cretaceous age.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nome

Comments on the production information

  • Production Notes = Stibnite was mined and stockpiled at the site. Small amounts of gold have been produced at the site from the schistose zone and from adjacent alluvium.

Comments on the workings information

  • Workings / Exploration = Prospecting prior to 1947 identified an essentially stratabound zone that contains native gold and stibnite in the basal schistose zone of a massive marble unit. Subsequently prospectors found and probably mined small quantities of native gold from this zone. In 1995, Kennecott Exploration Company drilled one reverse-circulation hole into the schist-marble contact zone to test it near crosscutting faults that contain calcite veins in marble. The contact zone was appreciably mineralized for about 50 feet, with a maximum 5-foot intercept of more than 0.10 ounce of gold per ton.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012800
USGS Alaska Resource Data File ARDF NM091

Bibliographic references

  • Deposit

    Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p.

  • Deposit

    Hummel, C.L., 1962, Preliminary geologic map of the Nome D-1 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-248, 1 sheet, scale 1:63,360.

  • Deposit

    Sainsbury, C.L., Coleman, R.G., and Kachadoorian, Reuben, 1970, Blueschist and related greenschist faces rocks of the Seward Peninsula, Alaska, in Geological Survey research 1970: U.S. Geological Survey Professional Paper 700-B, p. B33-B42.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.

  • Deposit

    Hudson, T.L., and Arth, J. G., 1983, Tin-granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.

  • Deposit

    Forbes, R.B., Evans, B.W., and Thurston, S.P., 1984, Regional progressive high-pressure metamorphism, Seward Peninsula, Alaska: Journal of Metamorphic Geology, v. 2, p. 43-54.

  • Deposit

    Thurston, S.P., 1985, Structure, petrology, and metamorphic history of the Nome Group blueschist terrane, Salmon Lake area, Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 96, p. 600-617.

  • Deposit

    Armstrong, R.L., Harakal, J.E., Forbes, R.B., Evans, B.W., and Thurston, S.P., 1986, Rb-Sr and K-Ar study of metamorphic rocks of the Seward Peninsula and southern Brooks Range, Alaska, in Evans, B.W., and Brown, E.H., eds., Blueschists and eclogites: Geological Society of America Memoir 164, p. 184-203.

  • Deposit

    Miller, E.L., and Hudson, T.L., 1991, Mid-Cretaceous extensional fragmentation of a Jurassic-Early Cretaceous compressional orogen, Alaska: Tectonics, v. 10, p. 781-796.

  • Deposit

    Miller, E.L., Calvert, A.T., and Little, T.A., 1992, Strain-collapsed metamorphic isograds in a sillimanite gneiss dome, Seward Peninsula, Alaska: Geology, v. 20, p. 487-490.

  • Deposit

    Ford, R.C., 1993, Geology, geochemistry, and age of gold lodes at Bluff and Mt. Distin, Seward Peninsula, Alaska: Golden, Colorado School of Mines, Ph.D. dissertation, 302 p.

  • Deposit

    Apodoca, L. E., 1994, Genesis of lode gold deposits of the Rock Creek area, Nome mining district, Seward Peninsula, Alaska: Boulder, Colorado, University of Colorado, Ph.D. dissertation, 208 p.

  • Deposit

    Hudson, T.L. 1994, Crustal melting events in Alaska, in Plafker, G., and Berg, H. C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North America, v. G-1, p. 657-670.

  • Deposit

    Till, A.B., and Dumoulin, J.A, 1994, Geology of Seward Peninsula and St. Lawrence Island, in Plafker, G., and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, The Geology of North America, DNAG, v. G-1, p. 141-152.

  • Deposit

    Amato, J.M., Wright, J.E., Gans, P.B., and Miller, E.L., 1994, Magmatically induced metamorphism and deformation in the Kigluaik gneiss dome, Seward Peninsula, Alaska: Tectonics, v. 13, p. 515-527.

  • Deposit

    Dumitru, T.A., Miller, E.L., O'Sullivan, P.B., Amato, J.M., Hannula, K.A., Calvert, A.T., and Gans, P.B., 1995, Cretaceous to Recent extension in the Bering Strait region, Alaska: Tectonics, v. 14, p. 549-563.

  • Deposit

    Hannula, K.A., Miller, E.L., Dumitru, T.A., Lee, Jeffrey, and Rubin, C.M., 1995, Structural and metamorphic relations in the southwest Seward Peninsula, Alaska; Crustal extension and the unroofing of blueschists: Geological Society of America Bulletin, v. 107, p. 536-553.

  • Deposit

    Hannula, K.A., and McWilliams, M.O., 1995, Reconsideration of the age of blueschist facies metamorphism on the Seward Peninusla, Alaska, based on phengite 40Ar/39Ar results: Journal of Metamorphic Geology, v. 13, p. 125-139.

  • Deposit

    Ford, R.C., and Snee, L.W., 1996, 40Ar/39Ar thermochronology of white mica from the Nome district, Alaska: The first ages of lode sources to placer gold deposits in the Seward Peninsula: Economic Geology, v. 91, p. 213-220.

  • Deposit

    Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, 482 p.

  • Deposit

    Amato, J.M., and Wright, J.E., 1997, Potassic mafic magmatism in the Kigluaik gneiss dome, northern Alaska -- A geochemical study of arc magmatism in an extensional tectonic setting: Journal of Geophysical Research, v. B102, no. 4, p. 8065-8084.

  • Deposit

    Amato, J.M., and Wright, J.E., 1998, Geochronologic investigations of magmatism and metamorphism within the Kigluaik Mountains gneiss dome, Seward Peninsula, Alaska, in Clough, J.G., and Larson, Frank, eds., Short Notes on Alaskan Geology 1997: Alaska Division of Geological and Geophysical Surveys Professional Report 118a, p. 1-21.

  • Deposit

    Bundtzen, T.K., Reger, R.D., Laird, G.M., Pinney, D.S., Clautice, K.H., Liss, S.A., and Cruse, G.R., 1994, Progress report on the geology and mineral resources of the Nome mining district: Alaska Division of Geological and Geophysical Surveys, Public Data-File 94-39, 21 p., 2 sheets, scale 1:63,360.

Comments on the references

  • Primary Reference = This report

General comments

Subject category Comment text
Deposit Model Name = Massive stibnite lenses and disseminated gold-bearing mineralization in calcareous schist below marble.
Deposit Other Comments = the site has been selected by Bering Straits Native Corporation of Nome.

Reporter information

Type Date Name Affiliation Comment
Reporter 22-OCT-99 Hawley, C.C. Hawley Resource Group
Reporter 22-OCT-99 Travis L. Hudson Hawley Resource Group