Unnamed Prospect (ARDF - NB045; east of lower Nabesna Glacier), Chisana Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Prospect (ARDF - NB045; 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° 9' 17'' North , 142° 49' 47'' West
Latitude & Longitude (decimal):
Köppen climate type:
The prospect is in the Wrangell-St. Elias National Preserve.
Location: This prospect is on the lower-west flank of the large ridge east of Nabesna Glacier. It is at an elevation of about 3,500 feet in a small drainage about 5,000 feet west of peak 6045 and 1,500 feet east of the glacier. The site is in the SW1/4 of section 3, T. 4 N., R. 14 E. of the Copper River Meridian. This is locality 7 of Richter (1973), locality 24 of Richter and others (1975), and National Park Service locality WRST-42 (unpublished data). Cobb and Richter (1980 [OFR 80-927]) include this locality as an 'Unnamed prospect'. It is located to within a few hundred feet.
Geology: Hydrothermally altered porphyry dikes and small masses of quartz diorite contain disseminated pyrite and chalcopyrite; local stockworks of quartz veins with pyrite and chalcopyrite also cut volcanic country rocks (Richter and Matson, 1970 [OFR 70-276]; Richter and others, 1975). Assays of 3 rock samples from this area contained 0.2 to 0.4 ounce gold per ton. One is a 200-foot composite chip sample of pyrite-bearing sericitized porphyry that contained 0.04 ounce of gold per ton and 2,000 parts per million copper (Richter and Matson, 1970 [OFR 70-276]). The altered intrusive rocks are Tertiary in age (Richter, 1973). They cut volcanic rocks and argillite of the upper Paleozoic Tetelna Volcanics (Richter, 1973; 1976).
Workings: Surface prospecting has occurred in this area.
Age: The altered and mineralized intrusive rocks are considered to be Tertiary (Richter, 1973).
Alteration: Quartz-sericite-pyrite replacement and veining.
Commodities (Major) - Au, Cu
Development Status: None
Deposit Model: Disseminated and stockwork veins with copper and gold
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
5 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | Oxygen | |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | NB045 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainVolcanic Arc
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