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Unnamed Occurrence (ARDF - MH062; on peak 6275), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MH062; on peak 6275) | - not defined - |
| Valdez Creek Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 15' 47'' North , 146° 40' 30'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on the divide between the West Fork Maclaren River and upper Cottonwood Creek. It is at an elevation of about 6,200 feet on the south side of peak 6275 and near the center of the S1/2SW1/4 section 18, T. 19 S., R. 6 E., Fairbanks Meridian. The location corresponds to locality 28 in table 2 of Nokleberg and others (1991).
Geology: The rock at this the occurrence is metabasalt of the Nikolai Greenstone of Late Triassic age. The occurrence is a narrow quartz-epidote vein that contains pyrite and possibly chalcopyrite. A grab sample of vein material contained 5 parts per million (ppm) silver and 0.1 ppm gold (Nokleberg and others, 1991). Similar quartz-epidote veins near this site contain chalcopyrite or other copper minerals; copper was not, however, reported in the analysis from the occurrence on peak 6275.
Workings: There are no workings reported at this site.
Age: Younger than Late Triassic; probably Cretaceous or early Tertiary (see MH060).
Commodities (Major) - Ag, Au; (Minor) - Cu (?)
Development Status: None
Deposit Model: Copper-bearing low-sulfide quartz vein. Basaltic Cu (Cox and Singer, 1986; mode
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 |
| ⓘ 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 | |||
|---|---|---|---|
| ⓘ | Chalcopyrite ? | 2.CB.10a | CuFeS2 |
| ⓘ | 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 | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MH062 |
|---|
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