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Pleasant Creek

Prospect in Alaska, United States with commodities Lead, Zinc, Silver, Arsenic, Cobalt, Copper, Antimony
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307408
Record type Site
Current site name Pleasant Creek

Geographic coordinates

Geographic coordinates: -141.05576, 65.1768 (WGS84)
Relative position The Pleasant Creek prospects are located in the central and southwest portion of T. 4 N., R. 33 E., of the Fairbanks Meridian. They have an irregular boundary and cover about 6 square miles. The easternmost boundary is the Canadian border, and they do not encompass VABM Pack. Coordinates are for the northernmost prospect, in section 16, T. 4 N., R. 33 E., of the Fairbanks Meridian. The location is accurate. These prospects are located within Doyon Limited selected or conveyed land.

Site location context

Political divisions (FIPS codes)

Southeast Fairbanks(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Charley River A-1(quadrangle 1:63,360 scale)

Charley River SE(quadrangle 1:100,000 scale)

Charley River(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

Doyon, Limited(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Yukon-Charley Rivers National Preserve(National Preserve)

National Preserve NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Zinc Critical Primary
Silver Secondary
Arsenic Critical Secondary
Cobalt Critical Secondary
Copper Secondary
Antimony Critical Secondary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue
Serpentine Gangue

Alteration

  • (Local) The alteration at the Pleasant Creek prospects includes serpentization, silicification, and quartz veining.

Mineral occurrence model information

Model code 228
USGS model code 32b
Deposit model name Mississippi Valley, Appalachian Zn
Mark3 model number 42

Nearby scientific data

(1) -141.05576, 65.1768
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Rock units in the prospect area are of Late Precambrian age and include a thick unit of basalt and redbeds with an interlayered sequence of massive carbonate rocks and conglomerate (DiMarchi and others, 1993). Carbonate rocks include the Pack Formation, a massive dolomite that lies unconformably over the Pleasant Creek Formation of dolomitic limestone, quartzite, and shale. Numerous facies changes and iron-rich zones characterize the prospect area. All of the units are folded along a northeast-trending anticlinal structure which is probably sympathetic to the larger scale Cathedral Creek arch. The prospect area also contains numerous northeast-trending thrust faults and two major high-angle faults, having displacements of 700 to 1,500 feet. A northeast-trending andesite dike swarm cuts across all of the map units in the area (DiMarchi and others, 1993). The prospect hosts two types of breccia: (1) areally extensive collapse breccias related to karsting in the carbonate units; and (2) an areally limited breccia related to faulting along the margins of the andesite dikes. Small iron oxide gossans along the breccias may increase with depth. Silicification and quartz veining are common in both breccia types, and serpentine is found rarely in fractures in the dolomite (DiMarchi and others, 1993). Mineralization at Pleasant Creek consists of a breccia body of unrotated dolomite fragments coated with pyrite in an open-space-fill matrix of coarse dolomite and massive pyrite; very fine grained, light colored sphalerite infilling brecciated pyrite; and late galena cubes (Andres and others, 1977). Soil sampling, rock sampling, and geologic mapping programs have been conducted at the Pleasant Creek prospects (DiMarchi and others, 1993).

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name Black

Comments on the workings information

  • Workings / Exploration = Soil sampling, rock sampling, and geologic mapping programs have been conducted at the Pleasant Creek prospects (DiMarchi and others, 1993).

Reference information

Bibliographic references

  • Deposit

    Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.

  • Deposit

    DiMarchi, J.J., Weglarz, T.B., Adams, D.D., Hubert, J.A., and West, A.W., 1993, 1993 annual report reconnaissance program, Doyon option lands: ASA Inc., 120 p. (Report held by Doyon Ltd., Fairbanks, Alaska.)

  • Deposit

    Andrews, Tom, Bigelow, C.G., Fernette, J.P., Jirik, R., Kretschmar, U., Kretschmar, D., Lessman, J., McOuat, M., Martin, W., Ruzicka, J., Sandrock, G., Skyllingstad, P., Yinger, M., 1977, 1976 Annual progress report, Doyon project volume 1a, blocks 1, 4, 5, 7, 8: Anchorage, Alaska, WGM, Inc., p. 7-1 to 7-23. (Report held by Doyon, Limited, Fairbanks, Alaska.)

Comments on the references

  • Primary Reference = DiMarchi and others, 1993

General comments

Subject category Comment text
Deposit Model Name = Plutonic-related Pb-Zn?, Carbonate-hosted Zn? (Cox and Singer, 1986; model 32b)
Deposit Other Comments = This property lies on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited. This site is within the Yukon-Charley Rivers National Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-00 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

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