Unnamed Occurrence (ARDF - MH105; north of the head of Eureka Creek), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 16' 37'' North , 146° 18' 10'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 3,700 feet on peak 3710, northeast of the head of Eureka Creek, and in the SE1/4SE1/4 section 12, T. 19 S., R.7 E., Fairbanks Meridian. The occurrence corresponds to locality 40 in table 2 of Nokleberg and others (1991).
Geology: This occurrence is in olivine-pyroxene cumulate in the Fish Lake ultramafic complex. The complex is a lopolithic feeder of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). Chromite is disseminated in the olivine-pyroxene cumulate. Grab sample 79ZN070A contained more than 5,000 parts per million chromium (Nokleberg and others, 1991, table 2).
Workings: The occurrence is covered by active Fort Knox Gold Resource claims.
Age: Late Triassic, the age of the host rock.
Commodities (Major) - Cr
Development Status: None
Deposit Model: Chromite disseminated in a layered mafic-ultramafic complex.
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
1 valid mineral.
Detailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| Si | Silicon | |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS - Alaska: | MH105 |
|---|
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