Unnamed Prospect (ARDF - NB097; south of upper Gravel Creek), Chisana Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 4' 42'' North , 141° 15' 10'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
202330
Long-form identifier:
mindat:1:2:202330:7
GUID (UUID V4):
70f40eb7-d065-47cc-a72b-586e493eeed6
The prospect is in the Wrangell-St. Elias National Preserve.
Location: This prospect is about 1,500 feet south of upper Gravel Creek and 2,000 feet north-northwest of peak 7510. The prospect is about 0.5 mile east-southeast of the center of section 31, T. 4 N., R. 23 E. of the Copper River Meridian. This is locality 5 of Richter and others (1973), locality 50 of Richter and others (1975), and National Park Service locality WRST-88 (unpublished data). It is located to within a few hundred feet.
Geology: Disseminated pyrite and minor chalcopyrite occur in diorite near its contact with Jurassic or Cretaceous siliciclastic rocks (Richter and others, 1973). The deposit is marked by a hydrothermal alteration zone 300 by 1,000 feet in size. Surface samples average less than 0.10 percent copper and less than 0.01 percent molybdenum (Matson and Richter, 1971 [OFR 71-202]; Richter and others, 1975). The deposit is estimated to contain 12 million tons of material with an average grade of 0.20 percent copper and very low molybdenum (Richter and others, 1975). The diorite host rock is considered part of the Klein Creek pluton which has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and others, 1975).
Workings: There has been some surface exploration.
Age: Mid-Cretaceous; the diorite host rock is part of the Klein Creek pluton which has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).
Alteration: A hydrothermal alteration zone is developed over an area of about 300 by 1,000 feet. Oxidation has resulted in iron-staining of this area.
Reserves: The deposit is estimated to contain 12 million tons of material with an average grade of 0.20 percent copper and very low amounts of molybdenum (Richter and others, 1975).
Commodities (Major) - Cu; (Minor) - Mo
Development Status: None
Deposit Model: Porphyry Cu-Mo (Cox and Singer, 1986; model 21a)
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 |
ⓘ Molybdenite Formula: MoS2 |
ⓘ Pyrite Formula: FeS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Molybdenite | 2.EA.30 | MoS2 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
S | Sulfur | |
---|---|---|
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Molybdenite | MoS2 |
S | ⓘ Pyrite | FeS2 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Mo | Molybdenum | |
Mo | ⓘ Molybdenite | MoS2 |
Other Databases
Link to USGS - Alaska: | NB097 |
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Other Regions, Features and Areas containing this locality
North America
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainDomain
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