Unnamed Cr occurrence [1], Valdez Creek Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Cr occurrence [1] | Occurrence |
| Valdez Creek Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 18' 55'' North , 146° 25' 44'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Other/historical names associated with this locality:
Nokleberg and others locality 37
Location: This occurrence is at an elevation of about 6,500 feet on peak 6580, about 2 miles west of the toe of Eureka Glacier, near the north end of the boundary between sections 32 and 33, T18S, R7E, Fairbanks Meridian. The occurrence corresponds to locality 37 in table 2 of Nokleberg and others (1991).
Geology: This occurrence is in an Upper Triassic mafic intrusive complex (Nokleberg and others, 1991). Rose (1966 [ADMM GR 20, figure 3]) mapped the complex as diorite, quartz diorite, and gabbro. The occurrence consists of chromite disseminated in a serpentinized olivine cumulate inclusion in metagabbro. Sample 79NK242B contained more than 0.5 per cent chromium (Nokleberg and others, 1991).
Workings: This occurrence was discovered during geologic mapping (Nokleberg and others, 1991). It is on active MAN Resources claims (W.T. Ellis, unpublished field notes, 2001).
Age: Late Triassic, the age of the ultramafic inclusion.
Alteration: The olivine cumulate inclusion is serpentinized.
Commodities (Major) - Cr
Development Status: None
Deposit Model: Disseminated chromite in mafic-ultramafic rock.
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: | MH092 |
|---|
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