Crash Prospect, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Crash 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° 18' 59'' North , 146° 13' 15'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
197080
Long-form identifier:
mindat:1:2:197080:0
GUID (UUID V4):
33db1949-bf26-4c97-b197-46afc000791a
Location: The Crash prospect is at an elevation of about 5,200 feet, in the headwaters of an east-flowing tributary to the west fork of Broxson Gulch. The prospect is about 1,800 feet east of peak 5540, in the NW1/4NE1/4 section 33, T. 18 S., R. 8 E., Fairbanks Meridian.
Geology: The rock in the area of this prospect consists mainly of Upper Triassic gabbro and serpentinized dunite that are part of a sill that can be followed for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The sill is part of the informally named Eureka ultramafic complex (Nokleberg and others, 1991; W.T. Ellis, unpublished data, 1996). The mineral deposit consists of olivine melagabbro that contains as much as 7 percent disseminated sulfides and magnetite. The sulfides are mainly pyrrhotite and small amounts of chalcopyrite and pentlandite. Samples assayed as much as 0.09 percent copper, 0.42 percent nickel, 630 parts per billion (ppb) palladium, and 475 ppb platinum (W.T. Ellis, unpublished data, 1996).
Workings: The prospect is on active MAN Resources claims.
Age: Late Triassic, the age of the host rock.
Alteration: All of the ultramafic rock units are moderately to strongly serpentinized.
Commodities (Major) - Ni, Pd, Pt; (Minor) - Cr, Cu
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
5 valid minerals.
Detailed Mineral List:
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Chromite Formula: Fe2+Cr3+2O4 |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ Pentlandite Formula: (NixFey)Σ9S8 |
ⓘ Pyrrhotite Formula: Fe1-xS |
ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
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 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
Unclassified | |||
ⓘ | '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 | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
Si | Silicon | |
Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pentlandite | (NixFey)Σ9S8 |
S | ⓘ Pyrrhotite | Fe1-xS |
Cr | Chromium | |
Cr | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
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: | MH114 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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