Peggy Barbara; Ship Rock Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Peggy Barbara; Ship Rock Prospect | Prospect |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 10' 22'' North , 154° 51' 54'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
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 ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Detailed Mineral List:
| ⓘ Calcite Formula: CaCO3 Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
| ⓘ Cinnabar Formula: HgS Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
| ⓘ Stibnite Formula: Sb2S3 Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Stibnite | Sb2S3 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)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.
Other Databases
| Link to USGS - Alaska: | MG026 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Minchumina BasinBasin
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