Peggy Barbara

The Peggy Barbara is a mercury mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Peggy Barbara
Secondary: Ship Rock

Commodity

Primary: Mercury
Secondary: Antimony

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Hot-spring Hg

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Dickite alteration.

Rocks

Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Late Ordovician

Analytical Data

Not available

Materials

Ore: Cinnabar
Ore: Stibnite
Gangue: Calcite

Comments

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

Comment (Reference): Primary Reference = Sainsbury and MacKevett, 1965

Comment (Deposit): Model Name = Probably Hot Springs Mercury (Cox and Singer, 1986; model 27a).

Comment (Deposit): Other Comments = Mineralization may be related to the nearby Farewell-Denali strike slip fault system (Gilbert, 1981; Wilson and others, 1998).

Comment (Geology): 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).

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Blodgett, R.B., and Gilbert, W.G., 1983, The Cheeneetnuk Limestone, a new Early(?) to Middle Devonian formation in the McGrath A-4 and A-5 quadrangles, west-central Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 85, 6 pages, one sheet, 1:63,360 scale.

Reference (Deposit): Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Reference (Deposit): Maloney, R.P., 1967, Investigations of the White Mountain mercury deposit, Kuskokwim River basin, Alaska: U.S. Bureau of Mines Report of Investigations 6892, 94 pages.

Reference (Deposit): Gilbert, W.G., 1981, Preliminary geologic map of the Cheeneetnuk River area, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 153, 19 pages, 2 sheets, 1:63,360 scale.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the McGrath quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-379, 1 sheet, 1:250,000 scale.

Reference (Deposit): Sainsbury, C.L. and MacKevett, E.M., Jr., 1965, Quicksilver deposits of southwestern Alaska: U.S. Geological Survey Bulletin 1187, 89 p.

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