Unnamed Occurrence (ARDF - NB101; head of Little Creek), Chisana Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - NB101; head of Little Creek) | - not defined - |
| Chisana Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 3' 23'' North , 141° 10' 55'' West
Latitude & Longitude (decimal):
Köppen climate type:
The prospect is in the Wrangell-St. Elias National Preserve.
Location: This occurrence is about 500 feet northeast of elevation 7253 (Joe) in the uppermost headwaters of Little Creek. Little Creek flows southeast to east Braye Lake. The site is in the NW1/4 of section 10, T. 3 N., R. 23 E. of the Copper River Meridian. This is locality 8 of Richter and others (1973), locality 54 of Richter and others (1975), and National Park Service locality WRST-87 (unpublished data). Cobb and Richter (1980) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.
Geology: This occurrence is a 50- by 100-meter iron-stained zone in which pyrite and chalcopyrite are disseminated in a small diorite porphyry stock (Richter and others, 1975). Surface samples average less than 0.10 percent copper and less than 0.01 percent molybdenum. The deposit is estimated to contain 4 million tons with an average grade of 0.20 percent copper and very low amounts of molybdenum. The diorite porphyry that hosts the deposit intrudes Jurassic or Cretaceous siliciclastic rocks and is considered to be Cretaceous or Tertiary in age (Richter and others, 1973). The mid-Cretaceous, Klein Creek pluton and the Baultoff (NB100) porphyry copper-molybdenum deposit that it hosts, are exposed about 5,000 feet southwest of this prospect. The Klein Creek pluton has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).
Workings: Some surface prospecting has taken place.
Age: Mid-Cretaceous? The diorite porphyry that hosts the deposit may be about the same age as the Klein Creek pluton which has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).
Alteration: Oxidation; an iron-stained altered zone covers an area of 50 by 100 meters.
Commodities (Major) - Au, Cu, 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
2 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | NB101 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainVolcanic Arc
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