Eb No. 4 Prospect, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Eb No. 4 Prospect | Prospect |
| Delta River Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 15' 10'' North , 146° 11' 20'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Eb No. 4 prospect is at an elevation of 3,950 feet on the north-facing slope of a hill a mile south of upper Eureka Creek. The prospect is about 500 feet southeast of the center of section 22, T. 19 S., R. 8 E., Fairbanks Meridian. The location is accurate within one-tenth mile.
Geology: The Eb No. 4 prospect is hosted by the Fish Lake mafic-ultramafic complex, a lopolithic feeder of Late Triassic age of the Nikolai basalt flows (Nokleberg and others, 1991). The prospect lies in lower portion of the gabbroic unit of the second magmatic cycle of the Fish Lake ultramafic complex (W.T. Ellis, unpublished data, 1996). The prospect consists of float of sulfide-bearing coarse-grained pyroxenite; samples assay as much as 0.1 percent copper, 0.08 percent nickel, 140 parts per billion (ppb) palladium, and 85 ppb platinum. The metallic minerals are mainly pyrrhotite, along with chalcopyrite and pentlandite. The deposit does not crop out, but a good geophysical conductor is present that has been interpreted to be caused by sulfide accumulations (W.T. Ellis, unpublished data, 1996). Twelve hundred feet along strike a drill hole intersected 54 feet of pyroxenite grading 0.1 percent copper, 0.15 percent nickel, 198 ppb palladium, and 123 ppb platinum. This pyroxenite contained from 7 to 10 percent sulfides (W.T. Ellis, unpublished data, 1996).
Workings: The occurrence is on active Fort Knox Gold Resource claims.
Age: Late Triassic, the age of the host rock.
Commodities (Major) - Cu, Ni, 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
3 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pentlandite Formula: (NixFey)Σ9S8 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pentlandite | 2.BB.15 | (NixFey)Σ9S8 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pentlandite | (NixFey)Σ9S8 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pentlandite | (NixFey)Σ9S8 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Ni | Nickel | |
| Ni | ⓘ Pentlandite | (NixFey)Σ9S8 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MH170 |
|---|
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