Unnamed Occurrences (ARDF - MH290; southwest of Slate Creek), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 9' 32'' North , 144° 52' 37'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: These occurrences are at the approximate center of localities 28 and 29 on figure 1 of Rose (1967). The location is at an elevation of about 4,400 feet in the NW1/4NE1/4 section 28, T. 20 S., R. 15 E., Fairbanks Meridian. Rose's locality 29 is a few hundred feet west-northwest of the location; his locality 28 is a few hundred feet east-southeast of it.
Geology: Rocks in the vicinity of these occurrences consist of andesite and dacite agglomerate, tuff, and flows of Pennsylvanian to Permian (?) age (Rose, 1967). Boulders of hematite and hematite-pyrite were found at two main sites on a steep side hill, and the source of the boulders is probably subjacent to or just above the talus. Andesite and dacite near the site have been extensively pyritized, possibly by nearby intrusions of Mesozoic age. The boulders are possibly from a contact-metamorphic type of iron deposit. Iron-rich deposits nearby locally contain copper (about one half mile to the southeast).
Workings: Only geologic mapping and surface prospecting.
Age: Mesozoic (?), inferred from nearby plutons of that age.
Alteration: Replacement of intermediate volcanic rocks by iron minerals.
Commodities (Major) - Fe
Development Status: None
Deposit Model: Possibly Fe skarn (Cox and Singer, 1986; model 18d).
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
2 valid minerals.
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 | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Hematite | Fe2O3 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | MH290 |
|---|
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