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Peggy Barbara; Ship Rock Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Peggy Barbara; Ship Rock ProspectProspect
Yukon-Koyukuk Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
62° 10' 22'' North , 154° 51' 54'' West
Latitude & Longitude (decimal):
62.17278,-154.86500
GeoHash:
G#: be1ceynwx
GRN:
N42W54
Type:
Prospect
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
199346
Long-form identifier:
mindat:1:2:199346:5
GUID (UUID V4):
0


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

Location: 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).

Geology: 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).

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

Alteration: Dickite alteration.

Commodities (Major) - Hg; (Minor) - Sb

Development Status: No

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

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


3 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘCinnabar2.CD.15aHgS
ⓘStibnite2.DB.05Sb2S3
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3

List of minerals for each chemical element

CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ CalciteCaCO3
SSulfur
Sⓘ CinnabarHgS
Sⓘ StibniteSb2S3
CaCalcium
Caⓘ CalciteCaCO3
SbAntimony
Sbⓘ StibniteSb2S3
HgMercury
Hgⓘ CinnabarHgS

Other Databases

Link to USGS - Alaska:MG026

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sainsbury, C.L., MacKevett, E.M., Jr. (1965) Quicksilver deposits of southwestern Alaska. U.S. Geological Survey Bulletin 1187, 89 pages.
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.
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.
Gilbert, W.G. (1981) Preliminary geologic map and geochemical data, Cheeneetnuk River area, Alaska. Alaska Division of Geological and Geophysical Surveys Open-File Report 153, 12 pages, 2 sheets, 1:63,360 scale.
Blodgett, R.B., 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, 1 sheet, scale 1:63,360.
Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., Haeussler, P.J. (1998) Geologic map of central (interior) Alaska. U.S. Geological Survey Open-File Report 98-133, 76 pages, 3 sheets, scale 1:500,000.
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