Unnamed Occurrence (ARDF - MH241; east of mile 195 on Richardson Highway), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 7' 52'' North , 145° 28' 15'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201282
Long-form identifier:
mindat:1:2:201282:0
GUID (UUID V4):
409d3897-8f7d-46ce-93de-ab59d790b53e
Location: This occurrence is at an elevation of 3,600 feet, 0.75 mile due east of mile 195 on the Richardson Highway. It is at the northeast corner of section 5, T. 20 S., R. 12 E., Fairbanks Meridian.
Geology: The rock exposed at this site is mainly Upper Triassic coarse-grained to pegmatitic olivine melagabbro containing 20 percent olivine, 70 percent clinopyroxene, and 10 percent intercumulus plagioclase. Mineralization consists of chalcopyrite, pentlandite, and pyrrhotite in iron-stained, magnetite-bearing skarn of intergrown clinopyroxene and amphibole. The olivine in the melagabbro is partly serpentinized, and the pyroxene is mostly altered to amphibole. A sample of the mineralized rock contained 1.07 percent copper, 1.58 percent nickel, 484 parts per billion (ppb) palladium, 300 ppb platinum, and 110 ppb gold. (The source of all this information is W.T. Ellis, oral communication, 1998.)
Workings: A sample of the mineralized rock contained 1.07 percent copper, 1.58 percent nickel, 484 parts per billion (ppb) palladium, 300 ppb platinum, and 110 ppb gold (W.T. Ellis, oral communication, 1998). The prospect had been staked, but the area is closed to mineral entry because it is in the Alyeska pipeline corridor.
Age: Late Triassic.
Alteration: The olivine is partly serpentinized, and the pyroxene is mostly altered to amphibole. There is also local iron staining.
Commodities (Major) - Cu, Ni, Pd, Pt
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
4 valid minerals.
Detailed Mineral List:
ⓘ 'Amphibole Supergroup' Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ 'Clinopyroxene Subgroup' |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ 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 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
Unclassified | |||
ⓘ | 'Amphibole Supergroup' | - | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
ⓘ | 'Clinopyroxene Subgroup' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
O | Oxygen | |
O | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
F | Fluorine | |
F | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Al | Aluminium | |
Al | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Si | Silicon | |
Si | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pentlandite | (NixFey)Σ9S8 |
S | ⓘ Pyrrhotite | Fe1-xS |
Cl | Chlorine | |
Cl | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Ti | Titanium | |
Ti | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
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: | MH241 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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