Unnamed Occurrence (ARDF - SR221; northern Chenega Island), Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
60° 20' 27'' North , 148° 2' 2'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: The occurrence is located near the summit of hill 1640 at an elevation of about 1,600 feet. It is in the NE1/4 section 22, T. 3 N., R. 8 E., of the Seward Meridian. This is location 220 of Tysdal (1978 [MF-880-A]) and location S-88 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The occurrence is a 15-foot-wide shear zone containing quartz-epidote veins with traces of disseminated pyrite. The zone strikes N5E and dips vertically (Kurtak and Jeske, 1986). Several quartz veins and lenses occur within the zone; the largest of these measures 4 inches wide by 2 feet long. Relic pillow textures are common in the unsheared greenstone. The bedrock in this area is Orca Group of early Teriary age (Nelson and others, 1985). Two chip samples were collected: one 15-foot-long sample from sheared greenstone, and one of unknown length from greenstone with remnant pillow structures. They contained from 125 to 115 ppm copper and 1,400 to 1,600 ppm manganese, respectively (Kurtak and Jeske, 1986). Tysdal (1978 [MF-880-A]) reported 15 percent iron and 1,500 ppm manganese.
Workings: Two chip samples were collected: one 15-foot-long sample from sheared greenstone, and one of unknown length from greenstone with remnant pillow structures. They contained from 125 to 115 ppm copper and 1,400 to 1,600 ppm manganese, respectively (Kurtak and Jeske, 1986). Tysdal (1978 [MF-880-A]) reported 15 percent iron and 1,500 ppm manganese.
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Commodities (Major) - Cu; (Minor) - Fe, Mn
Development Status: None
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:
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | SR221 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Prince WilliamAccretionary Complex
- Yakutat-Malaspina DomainDomain
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