Unnamed Occurrence (ARDF - MH192; northeast of Fourteenmile Lake), Delta River Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 6' 1'' North , 145° 44' 45'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of 4,050 feet about 2 miles north-northeast of Fourteenmile Lake. It is in the NE1/4NW1/4 section 13, T. 21 S., R. 10 E., Fairbanks Meridian. This site corresponds to locality S87 in table 2 of Nokleberg and others (1991).
Geology: The occurrence is represented by a grab sample of olivine-pyroxene cumulate containing sparsely disseminated chromite (Nokleberg and others, 1991, sample 79ZN012A). The sample contained more than 5,000 parts per million chromium. The rocks at this occurrence are part of the Tangle mafic-ultramafic intrusive complex of Late Triassic age, which may be a feeder of the Nikolai greenstone basalt flows of the Wrangellia Terrane (W.T. Ellis, oral communication, 2001). The Tangle complex is a north-dipping layered intrusion of dunite, peridotite, and gabbro that varies from less than 2,000 feet thick to more than 4,000 feet thick and extends for more than 12 miles in length (W.T. Ellis, oral communication, 2001). The complex intrudes the Tangle Formation of Permian age (Nokleberg and others, 1991). It may connect with the Fish Lake complex at depth below the Amphitheater synform. Magmatic mineralization is synchronous with emplacement of Tangle complex, which is part of a 120-mile-long belt of mafic-ultramafic and associated rocks in the east-central Alaska Range.
Workings: The occurrence is on active claims of MAN Resources.
Age: Late Triassic.
Commodities (Major) - Cr
Development Status: No
Deposit Model: Disseminated chromite 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' |
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' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS - Alaska: | MH192 |
|---|
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