Unnamed Occurrence (ARDF - MH175; west of Fish Lake), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MH175; west of Fish Lake) | - not defined - |
| Delta River Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 14' 7'' North , 146° 3' 57'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201241
Long-form identifier:
mindat:1:2:201241:7
GUID (UUID V4):
25102bab-649b-409d-91b0-e4d275179677
Location: This occurrence, west of Fish Lake at an elevation of 4,100 feet, is about a half-mile west-northwest of VABM Wild. It is in the SE1/4SW1/4 section 29, T. 19 S., R. 9 E., Fairbanks Meridian. The occurrence corresponds to locality 70 in table 2 of Nokleberg and others (1991).
Geology: The rock at this occurrence is the Fish Lake mafic-ultramafic intrusive complex of Late Triassic age, which is believed to be a lopolithic feeder of the Nikolai basalt flows ( Nokleberg and others, 1991). The occurrence consists of serpentinized olivine-pyroxene cumulate containing disseminated chromite. Grab sample 79ZN026A of this material contained more than 5,000 parts per million chromium (Nokleberg and others, 1992, table 2, locality 70).
Workings: The occurrence is on active Fort Knox Gold Resource claims.
Age: Late Triassic, the age of the host rock.
Alteration: Serpentinization.
Commodities (Major) - Cr
Development Status: None
Deposit Model: Chromite disseminated in 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' |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
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' | - | |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Si | Silicon | |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS - Alaska: | MH175 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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References
