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Pierson

Prospect in Alaska, United States with commodities Silver, Gold, Copper
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Geologic information

Identification information

Deposit ID 10001054
MRDS ID A011732
Record type Site
Current site name Pierson
Related records 10112854

Geographic coordinates

Geographic coordinates: -143.67863, 61.6066 (WGS84)
Relative position On slopes 6,000 ft southeast of toe of Kuskulana Glacier. Best location: MacKevett and others, 1978, loc. 26. Accurate within radius of 100 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Secondary

Comments on the commodity information

  • Ore Material = Gold (native)

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore

Alteration

  • (Local) Oxidation of Cu minerals.

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Carbonate > Limestone
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Nikolai Greenstone
    Rock description Nikolai Greenstone
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Chitistone Limestone
    Rock description Chitistone Limestone

Nearby scientific data

(1) -143.67863, 61.6066
ListMap

Comments on the geologic information

  • Geologic Description = Malachite-stained shear zone contains pyrite, chalcopyrite, and free gold. Shear zone, 1 m wide, occurs between Triassic Nikolai Greenstone and a brecciated latite dike, about 9 m thick, that intrudes along the contact of the Nikolai Greenstone and the Triassic Chitistone Limestone.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Chistochina

Comments on the workings information

  • Workings / Exploration = Grab sample assayed (MacKevett, 1976): 0.1 ppm Au (AA), 1.5 ppm Ag, 1,000 ppm As, 200 ppm Cu, 700 ppm Zn. Type of workings: surface.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011732
USGS Alaska Resource Data File ARDF MC048

Bibliographic references

  • Deposit

    Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, scale 1:63,360.

  • Deposit

    MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, 1 sheet, scale 1:63,360.

Comments on the references

  • Primary Reference = Moffit and Mertie, 1923

General comments

Subject category Comment text
Deposit Model Name = Lode: disseminated, shear zone

Reporter information

Type Date Name Affiliation Comment
Reporter 07-AUG-1997 Leonard, K.R. U.S. Geological Survey
Reporter 07-AUG-1997 Elliott, R.L. U.S. Geological Survey
Reporter 07-AUG-1997 Richter, D.H. U.S. Geological Survey