Copper Mountain

Prospect in Alaska, United States with commodities Copper, Lead, Silver, Gold

Geologic information

Identification information

Deposit ID 10094063
MRDS ID A012792
Record type Site
Current site name Copper Mountain
Related records 10233130

Geographic coordinates

Geographic coordinates: -165.2122, 64.87123 (WGS84)
Relative position The occurrence is on the south side of hill 1690, on the divide between Copper Creek and Dickens Creek. This hill was called Copper Mountain by Cathcart (1922, figure 15). It is locality 7 of Hummel (1962 [MF 242]) and was included with other nearby prospects in locality 16 of Cobb (1972 [MF-463], 1978 [OFR 78-93]).
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Azurite Ore
Bornite Ore
Chalcopyrite Ore
Galena Ore
Malachite Ore
Pyrite Ore
Calcite Gangue
Mica Gangue
Quartz Gangue

Alteration

  • (Local) Development of silica-rich layers, formation of white mica, bleaching of marble, and oxidation.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -165.2122, 64.87123

Comments on the geologic information

  • Geologic Description = The Copper Mountain prospect appears to be the most significant of the several copper prospects in this area (NM051, NM053, this prospect, NM055, NM056, and NM115). As reported by Smith (1908), blocks of marble are malachite stained, and hand-picked material contained 15 percent copper, 20 percent lead, rather high silver, and low gold. Bornite, galena, chalcopyrite, and copper carbonates were present in shallow workings that included a 10 foot shaft and an incline. The workings were caved or flooded in 1920 (Cathcart, 1922). Cathcart (1922) describes the mineralization here as sulfide-bearing, silica-rich layers in bleached marble. Some small quartz veinlets and muscovite are parallel to layers in the host metacarbonate rock. This prospect appears to have similarities to several other copper-bearing deposits in the eastern Teller quadrangle (for example, the Ward mine, Hudson, 1998, TE071) and in the western Solomon quadrangle (for example, the Wheeler mine, Hudson, 1999, SO172).? the country rocks here are interlayered pelitic schist and marble that is part of the Nome Group derived from Proterozoic to early Paleozoic protoliths (Thurston, 1985, figure 3A; 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 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). The relation of the Copper Mountain deposit to the lode gold deposits is uncertain. A mid-Cretaceous age for the stratabound copper deposits is possible, but Copper Mountain could have also formed in late Proterozoic synchronous with emplacement of some orthogneiss or in the early Paleozoic in relation to other plutonism.
  • Age = Late Proterozoic, early Paleozoic, or mid-Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Nome

Comments on the workings information

  • Workings / Exploration = Explored by pits, trenches, a shallow shaft, and an incline; these were caved or water-filled by 1920.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012792
USGS Alaska Resource Data File ARDF NM054

Bibliographic references

  • Deposit

    Smith, P.S., 1908, Investigations of mineral deposits of Seward Peninsula: U.S. Geological Survey Bulletin 345, p. 206-250.

  • Deposit

    Cathcart, S.H., 1922, Metalliferous lodes in southern Seward Peninsula: U.S. Geological Survey Bulletin 722, p. 163-261.

  • 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

    Hudson, T.L, 1998, Alaska Resource Data File, Teller quadrangle: U.S. Geological Survey Open-File Report 98-328, 235 p.

  • Deposit

    Hudson, T.L., 1999, Alaska Resource Data File, Solomon quadrangle: U.S. Geological Survey Open-File Report 99-573, 360 p.

Comments on the references

  • Primary Reference = Cathcart, 1922

General comments

Subject category Comment text
Deposit Model Name = Carbonate-hosted, sulfide-bearing silica-rich rock.

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