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Unnamed Occurrence (ARDF - MH363; on lower Alteration Creek), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MH363; on lower Alteration Creek) | - not defined - |
| Chistochina Mining District | Mining District |
| Valdez-Cordova Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 0' 53'' North , 144° 14' 49'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mentasta Lake | 112 (2011) | 26.3km |
| Slana | 147 (2011) | 37.2km |
Location: This occurrence is on the east side of Alteration Creek. It is near the north edge of the NW1/4NE1/4 section 10, T. 14 N., R. 6 E., Copper River Meridian, at an elevation of about 3,900 feet. The occurrence corresponds to locality 15 of Richter (1967).
Geology: The rocks at this occurrence are highly altered Tetelna Volcanics of Pennsylvanian age (Richter and others, 1977). Earlier Richter [1967] mapped the rocks as Slana basalt. The Tetelna Volcanics are largely composed of flows, avalanche deposits, and tuff with lesser amounts of fine-grained volcaniclastic rocks. An extensive area extending easterly has been silicified and pyritized. Subsequent oxidation, acid leaching, and formation of secondary limonite has nearly obliterated primary volcanic textures in the rocks. Richter (1967) found a trace of gold in two of three samples collected at or near this site. Two stream-sediment samples collected from Alteration Creek below the occurrence were weakly anomalous in copper (Richter, 1967). Extensive oxidation of pyrite at the site possibly resulted in acidic surface waters that mobilized copper and minimized the copper values in the stream-sediment samples.
Workings: Only limited surface sampling.
Age: Pennsylvanian to Permian on the basis of the age of the host rocks; may be related to and synchronous with a Cretaceous (?) intrusion about a mile to the east.
Alteration: Intense silicification and pyritization of original volcanic rocks.
Commodities (Major) - Au; (Minor) - Cu (?)
Development Status: None
Deposit Model: Porphyry Cu, distal (Cox and Singer, 1986; model 20c).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
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 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | MH363 |
|---|
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