Unnamed Occurrence (ARDF - NB047; east of lower Nabesna Glacier), Chisana Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - NB047; east of lower Nabesna Glacier) | - not defined - |
| Chisana Mining District | Mining District |
| Valdez-Cordova Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 7' 3'' North , 142° 49' 33'' West
Latitude & Longitude (decimal):
Köppen climate type:
The occurrence is in the Wrangell-St. Elias National Preserve.
Location: This occurrence is in an unnamed drainage on the lower-west flank of the large ridge east of Nabesna Glacier. It is at an elevation of about 4,000 feet, 7,800 feet northwest of peak 7445 and 3,000 feet east of the glacier. The occurrence is about 0.2 mile northeast of the center of section 22, T. 4 N., R. 14 E. of the Copper River Meridian. This is locality 13 of Richter (1973), locality 26 of Richter and others (1975), and National Park Service locality WRST-44 (unpublished data). Cobb and Richter (1980 [OFR 80-927]) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.
Geology: A quartz-pyrite vein with chalcopyrite and sphalerite cuts a quartz-eye- bearing rock that is either a volcanic flow rock or a shallow intrusive in upper Paleozoic, Tetelna Volcanics (Richter, 1973; Richter and others, 1975). A channel sample across a 1-foot-wide quartz vein with pyrite, chalcopyrite, and sphalerite contained 0.06 parts per million (ppm) gold, 15 ppm silver, more than 20,000 ppm copper, 700 ppm lead, and more than 10,000 ppm zinc (Richter and Matson, 1970 [OFR 70-276]).
Workings: Some surface prospecting has probably occurred here.
Age: Cretaceous or Tertiary? The upper Paleozoic host rocks are locally cut by Cretaceous and Tertiary intrusive rocks associated with base metal mineralization elsewhere in the Nabesna A-4 quadrangle (Richter, 1973).
Alteration: Quartz veining.
Commodities (Major) - Cu, Zn
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c)
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
Other Databases
| Link to USGS - Alaska: | NB047 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainVolcanic Arc
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