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Peggy Barbara

Prospect in Alaska, United States with commodities Mercury, 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. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002601
MRDS ID A015038
Record type Site
Current site name Peggy Barbara
Alternate or previous names Ship Rock

Geographic coordinates

Geographic coordinates: -154.86785, 62.17251 (WGS84)
Relative position The Peggy Barbara prospect is located on a limestone bluff adjacent to an east fork of the Cheeneetnuk River, about 1 mile (1.5 km) south of the White Mountain Mercury Mine airstrip in the NW1/4 sec. 18, T. 24 N., R. 30 W., of the Seward Meridian. The reporter visited the prospect in 1989 (Alaska Division of Geological and Geophysical Surveys station no. 89BT117).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath A-4(quadrangle 1:63,360 scale)

McGrath SW(quadrangle 1:100,000 scale)

McGrath C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Stony River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Mercury Primary
Antimony Critical Secondary

Materials information

Materials Type of material
Cinnabar Ore
Stibnite Ore
Calcite Gangue

Alteration

  • (Local) Dickite alteration.

Mineral occurrence model information

Model code 177
USGS model code 27a
Deposit model name Hot-spring Hg

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Stratigraphic age (youngest) Late Ordovician

Nearby scientific data

(1) -154.86785, 62.17251
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Mineralization at the Peggy Barbara prospect consists of small stringers and lenses of cinnabar and minor stibnite in black-gray limestone of the Early Devonian Cheeneetnuk Limestone (Gilbert, 1981; Blodgett and Gilbert, 1983). Cinnabar is found in limestone blocks at the base of and within a 15 meter high by 60 meter long cliff; limestone was first cut by calcite veins and later cinnabar-stibnite mineralization accompanied by more calcite veining. ? the largest lens or pipe measures 10 cm by 30 cm in dimension with an unknown, steep rake into the limestone outcrop. One high grade sample contained 66.8% Hg (Sainsbury and MacKevett, 1965). Deposit geology is similar to that at the nearby Mary Margaret prospect (MG027) and the White Mountain Mercury mine (MG025).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = Only surface sampling has been conducted on the property. One sample contained 66.8 percent mercury (Sainsbury and MacKevett, 1965).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Sainsbury and MacKevett, 1965

General comments

Subject category Comment text
Deposit Model Name = Probably Hot Springs Mercury (Cox and Singer, 1986; model 27a).
Deposit Other Comments = Mineralization may be related to the nearby Farewell-Denali strike slip fault system (Gilbert, 1981; Wilson and others, 1998).

Reporter information

Type Date Name Affiliation Comment
Reporter 30-OCT-1998 T.K. Bundtzen Pacific Rim Geological Consulting

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.