Red Shale Occurrence, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Red Shale Occurrence | Occurrence |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 30' 57'' North , 154° 46' 33'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Red Shale occurrence is located in a low saddle along a north-south ridgeline about 3 kilometers west of VABM Lone; it is at an elevation of 1,475 feet (450 m) in the NE1/4 sec. 14, T. 28 N., R. 30 W., of the Seward Meridian. The reporter visited the site in 1982, 1992, and 1997.
Geology: The Red Shale occurrence is a stratiform, ferricrete gossan interbedded with quartzite, algal limestone, and dolomite of probable Cambrian or Late Proterozoic (?) age (Wilson and others, 1998). The section is exposed near the axis of an upright anticline that is structurally uplifted in a horst. The ferricrete zone occurs mainly as rubble crop and talus in a poorly exposed, shallow water, dolomite-carbonate dominant sequence that is interpreted to be the oldest exposed part of the Nixon Fork subterrane in the McGrath quadrangle (Babcock and others, 1994; Decker and others, 1994). The mineralized gossan strikes N15E, dips approximately 8E, ranges from 10 centimeters to 40 centimeters thick, and can be traced for about 140 meters along strike. Vegetation conceals the extensions of the mineralized area in both directions. Although poorly exposed, the mineralization is parallel to bedding. Minor late calcite incrustations were found in the ferricrete gossan. Three chip-channel samples (82BT219, 82BT221, 82BT222) taken at equally-spaced intervals along the exposed strike of the gossan zone contain up to 62.60 percent iron, 231 ppm copper, 485 ppm lead, 169 ppm nickel, and 2,250 ppm zinc (T.K. Bundtzen, written communication, 1983). No sulfides were recognized.
Workings: Three chip-channel samples (82BT219, 82BT221, 82BT222) taken at equally spaced intervals along the exposed strike of the gossan zone contain up to 62.60 percent iron, 231 ppm copper, 485 ppm lead, 169 ppm nickel, and 2,250 ppm zinc (T.K. Bundtzen, written communication, 1983).
Age: Late Proterozoic or Cambrian if mineralization is syngenetic.
Alteration: Strong ferricrete replacement of earlier sulfides.
Reserves: None.
Commodities (Major) - Pb, Zn; (Minor) - Cu
Development Status: No
Deposit Model: Uncertain; either Southeast Missouri Pb-Zn (?) or sedimentary exhalitive lead-z
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
2 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
Other Databases
| Link to USGS - Alaska: | MG011 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
- Minchumina BasinBasin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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