Unnamed (east side of Nabesna Glacier)

Prospect in Alaska, United States with commodities Copper, Zinc, Gold

Geologic information

Identification information

Deposit ID 10000759
MRDS ID A011400
Record type Site
Current site name Unnamed (east side of Nabesna Glacier)
Alternate or previous names Nabesna Glacier
Related records 10231910

Geographic coordinates

Geographic coordinates: -142.83559, 62.11219 (WGS84)
Relative position Best location: Richter, 1973, USGS I-789, loc. 12; on eastern margin of Nabesna Glacier. Accurate within 100 ft. radius.
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Zinc Primary
Gold Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Sphalerite Ore
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Strong hydrothermal limonitic staining.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock
    Rock unit name Tetelna Volcanics
    Rock description Tetelna Volcanics
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Meta-Basalt

Nearby scientific data

(1) -142.83559, 62.11219

Comments on the geologic information

  • Geologic Description = Quartz-pyrite veins and veinlets in 300 ft by 100 ft altered zone; locally Au-bearing and copper stained; veins carry minor sphalerite and chalcopyrite. Host rock is a buff to gray-green massive volcanic rock, locally brecciated and mineralized, containing quartz eyes up to 1/2 in diameter in fine grained matrix of quartz, feldspar, and white mica. Deposits occur in late Paleozoic metavolcanic porphyry and metabasalt flows of the Tetelna Volcanics; may be related to nearby Cretaceous and Tertiary granitic plutons and dikes.
  • Age = Cretaceous and Early Tertiary

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Chisana

Comments on the workings information

  • Workings / Exploration = Random chip sample across 300 ft of copper-stained rock (Richter and Matson, 1970, USGS OF 398 sample no. 227) contained 2 ppm Ag, 300 ppm Cu, 70 ppm Pb. Channel sample across 2-foot quartz-pyrite vein (sample no. 228) contained 0.02 ppm Au, 50 ppm Ag, more than 20,000 ppm Cu, 200 ppm Mo, 1500 ppm Pb, more than 10,000 ppm Zn. Analyses: gold by atomic absorption, all others semi-quantitative spectrographic method. Type of workings: surface.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011400
USGS Alaska Resource Data File ARDF NB048

Bibliographic references

  • Deposit

    Richter, D.H., 1973, Reconnaissance geological map of the Nabesna A-1 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map 1-789, scale 1:63,360.

  • Deposit

    Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, scale 1:250,000.

  • Deposit

    Richter, D.H., and Matson, N.A., 1970, Geochemical data from the Nabesna A-4 quadrangle, Alaska: U.S. Geological Survey Open-File Report 70-276, 14 p., 1 sheet, scale 1:63,360.

Comments on the references

  • Primary Reference = Richter, 1973, USGS I-789

General comments

Subject category Comment text
Deposit Model Name = Gold sulfide alterations and veins
Deposit Other Comments = Altered rocks have been interpreted as volcanic flow or shallow intrusive. Earliest report describes altered quartz porphyry and diorite as host rock.

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JAN-1997 Leonard, K.R. U.S. Geological Survey
Reporter 28-JAN-1997 Elliott, R.L. U.S. Geological Survey
Reporter 28-JAN-1997 Nokleberg, W.J. U.S. Geological Survey
Reporter 28-JAN-1997 W.J.; Richter, D.H. U.S. Geological Survey