Unnamed Occurrence (ARDF - MH278; near the east side of terminus of glacier at head of the West Fork Chistochina River), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 11' 13'' North , 144° 57' 39'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is about one-third mile southeast of the 1966 terminus of the glacier at the head of the West Fork Chistochina River (see figure 2 of Rose, 1967). It is about 0.6 mile northeast of the center of section 13, T. 20 S., R. 14 E., Fairbanks Meridian, and the location is accurate for the approximate center of a mineralized area.
Geology: The rocks in the vicinity of this occurrence are mainly andesite, notably pyritized (Rose, 1967). Rose mapped these rocks as Chisna Formation of Pennsylvanian to Permian age, but more recently they have been considered to be Tetelna Volcanics or Slana Spur Formation (Richter and Dutro, 1975). The area is not mapped in detail, but Rose (1967) showed two masses of pyritized rock north of a large stock of quartz monzonite and granodiorite. Two stream-sediment samples collected below the pyritized volcanic rocks are markedly anomalous in zinc ( 620 and 630 parts per million [ppm]), and moderately anomalous in lead (70 and 105 ppm) and have at least background amounts of copper (Rose, 1967).
Workings: There are no reported workings.
Age: Possibly related to the Pennsylvanian to Permian volcanic rocks or to emplacement of a nearby Mesozoic quartz monzonite pluton.
Alteration: Pyritic.
Commodities (Major) - Zn (?); (Minor) - Pb (?)
Development Status: None
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena ? | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MH278 |
|---|
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