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BOS Occurrence, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| BOS Occurrence | Occurrence |
| Delta River Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 20' 5'' North , 146° 19' 12'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: This occurrence is at an elevation of 5,100 feet about one-half mile east of the Eureka Glacier. It is about one-half mile northwest of peak 6563 in a hanging glacier cirque. The deposit is in the SE1/4SW1/4 section 24, T. 18 S., R. 7 E., Fairbanks Meridian.
Geology: The rock float at the BOS occurrence is derived from a sill-like body of Upper Triassic gabbro and serpentinized peridotite and dunite in the cliffs at the head of the cirque. The sill-like body is part of the Eureka ultramafic complex, which occupies strands of the Broxson Gulch thrust fault (W.T. Ellis, oral communication, 2001). At this occurrence, coarse-grained clots and disseminations of pyrrhotite, chalcopyrite, and pentlandite occur in olivine melagabbro and feldspathic peridotite. Sulfide abundance rarely exceeds about 5 percent in the float (W.T. Ellis, oral communication, 2001). A float sample from this occurrence contains 117 parts per billion (ppb) gold, 393 ppb platinum, 493 ppb palladium, 0.14 percent copper, and 0.4 percent nickel.
Workings: American Copper and Nickel Company collected samples about one-half mile east of this site that contain 0.26 percent nickel, 24 parts per billion (ppb) palladium, and 30 ppb platinum (W.T. Ellis, oral communication, 1996). A float sample from the BOS occurrence contains 117 parts per billion (ppb) gold, 393 ppb platinum, 493 ppb palladium, 0.14 percent copper, and 0.4 percent nickel (W.T. Ellis, oral communication, 2001. The occurrence is on active MAN Resources claims.
Age: Late Triassic.
Alteration: Moderate to strong serpentinization.
Commodities (Major) - Au, Cu, Ni, Pd, Pt
Development Status: None
Deposit Model: Differentiated mafic-ultramafic sill-form Ni-Cu-PGE.
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: | MH101 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Wrangellia DomainVolcanic Arc
- Yukon-TananaVolcanic Arc
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