Unnamed Occurrence (ARDF - NB041; west of lower Nabesna Glacier), Chisana Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - NB041; west 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° 8' 48'' North , 142° 55' 26'' West
Latitude & Longitude (decimal):
Köppen climate type:
The occurrence is in the Wrangell-St. Elias National Preserve.
Location: This occurrence is along the west side of lower Nabesna Glacier. It is at an elevation of about 3,400 feet and about 700 feet west of the glacier. The occurrence is about 0.4 mile north-northwest of the center of section 7, T. 4 N., R. 14 E. of the Copper River Meridian. This is locality 10 of Richter (1973), locality 20 of Richter and others (1975), and National Park Service locality WRST-27 (unpublished data). Cobb and Richter (1980) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.
Geology: A 10- to 20-cm-wide calcite vein contains gold and cobaltite (Richter and others, 1975). The vein contains up to 10 ounces of gold per ton (Richter and others, 1975). The vein is in highly altered and limonite-stained Triassic, Nikolai Greenstone(?) near the contact with a Tertiary porphyry intrusion (Richter, 1973).
Age: Tertiary? The age of the nearby porphyry is inferred to be Tertiary.
Alteration: The host rock to the vein is strongly hydrothermally altered (Richter, 1973).
Commodities (Major) - Au, Co
Development Status: None
Deposit Model: Vein
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Cobaltite | 2.EB.25 | CoAsS |
| 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 | ⓘ Cobaltite | CoAsS |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Co | Cobalt | |
| Co | ⓘ Cobaltite | CoAsS |
| As | Arsenic | |
| As | ⓘ Cobaltite | CoAsS |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | NB041 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainVolcanic Arc
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