Unnamed Occurrence (ARDF - MH285; northwest of Chistochina Glacier), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 12' 13'' North , 144° 52' 15'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201309
Long-form identifier:
mindat:1:2:201309:4
GUID (UUID V4):
614ec9d1-21f2-4855-a2e7-038e6a90e01a
Location: This occurrence is float on a moraine on the mountain northwest of the 1966 terminus of the glacier at the head of the Chistochina River. It is in the southern part of the SE1/4SE1/4 section 4, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 18 on figure 1 of Rose (1967) and locality 9 on figure 6 of Cobb (1979 [OFR 79-238]) and is included with nearby site MH284 in locality 133 on table 2 of Nokleberg and others (1991).
Geology: A dunite boulder was collected on glacial moraine near the projected contact of an ultramafic body consisting of dunite, peridotite, and pyroxenite with argillite of the Eagle Creek Formation (Rose, 1967). The ultramafic body is about 1,500 feet across and extends for about one mile, sandwiched between quartz monzonite to the south and argillite of the Eagle Creek Formation to the north. The boulder contained abundant pyrite and probably chalcopyrite and pyrrhotite; it assayed 0.75 percent copper, a trace of gold and platinum, 0.12 ounce of silver per ton, and 0.2 percent nickel (Rose, 1967). The boulder was probably derived locally.
Workings: No workings are reported. The sulfide-bearing boulder was found during mapping by Rose (1967).
Age: Probably related to ultramafic rocks of Late Triassic age.
Commodities (Major) - Cu; (Minor) - Ag, Au, Ni, 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 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Chalcopyrite ? | 2.CB.10a | CuFeS2 |
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
S | Sulfur | |
---|---|---|
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | MH285 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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