Unnamed Occurrence (ARDF - MH096; west of the terminus of Eureka Glacier), Valdez Creek Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 17' 15'' North , 146° 22' 12'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
201213
Long-form identifier:
mindat:1:2:201213:4
GUID (UUID V4):
b2f9abdc-7e59-4714-8ea4-1115abd781ae
Location: This occurrence is at an elevation of about 3,600 feet at the west edge of the terminus of Eureka Glacier (as shown on the 1951 [rev. 1978] edition of the Mount Hayes B-5 topographic map). The occurrence is in the NE1/4NE1/4 section 10, T. 19 S., R. 7 E., Fairbanks Meridian.
Geology: This occurrence is in the westernmost exposure of the Fish Lake ultramafic complex, a large layered lopolith of Late Triassic age considered to be comagmatic with the Upper Triassic Nikolai Greenstone (Nokleberg and others, 1991). This occurrence consists of sulfide minerals disseminated in the ultramafic complex. Chalcopyrite and pyrrhotite form about 5 to 7 percent of the olivine-clinopyroxene wehrlite. The wehrlite is about 100 feet stratigraphically below locally pegmatitic gabbro. Grab samples of sulfide-bearing wehrlite contained as much as 1,180 parts per million (ppm) copper, 1,650 ppm nickel, 58 parts per billion (ppb) palladium, and 50 ppb platinum (W.T. Ellis, unpublished data, 1996).
Workings: The occurrence is covered by active Fort Knox Gold Resources claims (W.T. Ellis, unpublished field notes, 1996).
Age: Late Triassic, synchronous with emplacement of the mafic-ultramafic rocks.
Alteration: The wehrlite is weakly serpentinized.
Commodities (Major) - Cu, Ni; (Minor) - Pd, Pt
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.
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.
Detailed Mineral List:
β Chalcopyrite Formula: CuFeS2 |
β Pyrrhotite Formula: Fe1-xS |
β 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Pyrrhotite | 2.CC.10 | Fe1-xS |
Unclassified | |||
β | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Serpentine Subgroup | D3[Si2O5](OH)4 |
O | Oxygen | |
O | β Serpentine Subgroup | D3[Si2O5](OH)4 |
Si | Silicon | |
Si | β Serpentine Subgroup | D3[Si2O5](OH)4 |
S | Sulfur | |
S | β Chalcopyrite | CuFeS2 |
S | β Pyrrhotite | Fe1-xS |
Fe | Iron | |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | MH096 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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