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Unnamed Occurrence (ARDF - MH241; east of mile 195 on Richardson Highway), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - MH241; east of mile 195 on Richardson Highway)- not defined -
Chistochina Mining DistrictMining District
Valdez-Cordova Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
63° 7' 52'' North , 145° 28' 15'' West
Latitude & Longitude (decimal):
63.13111,-145.47083
GRN:
N43W49
Köppen climate type:
ET : Tundra
Mindat Locality ID:
201282
Long-form identifier:
mindat:1:2:201282:0
GUID (UUID V4):
0


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 Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


4 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPentlandite2.BB.15(NixFey)Σ9S8
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
Unclassified
ⓘ'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ'Clinopyroxene Subgroup'-

List of minerals for each chemical element

HHydrogen
Hⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
OOxygen
Oⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oⓘ MagnetiteFe2+Fe23+O4
FFluorine
Fⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
AlAluminium
Alⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiSilicon
Siⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ Pentlandite(NixFey)Σ9S8
Sⓘ PyrrhotiteFe1-xS
ClChlorine
Clⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
TiTitanium
Tiⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Pentlandite(NixFey)Σ9S8
Feⓘ PyrrhotiteFe1-xS
NiNickel
Niⓘ Pentlandite(NixFey)Σ9S8
CuCopper
Cuⓘ ChalcopyriteCuFeS2

Other Databases

Link to USGS - Alaska:MH241

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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