Miyaoka West Prospect, Bonnifield Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Miyaoka West Prospect | Prospect |
| Bonnifield Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 42' 46'' North , 146° 44' 56'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
198924
Long-form identifier:
mindat:1:2:198924:6
GUID (UUID V4):
4f43c83a-f575-4d98-ab8a-3bc0434d3d31
Location: The Miyaoka West prospect is located in the headwaters of an unnamed east fork of Whistler Creek at an elevation of about 4,500 feet. The prospect, located here at the approximate midpoint of a southeast-trending mineralized zone about a mile long, is about 750 feet west of the center of section 10, T. 14 S., R. 5 E., Fairbanks Meridian.
Geology: Rocks at the Miyaoka West prospect consist of complexly deformed greenstone, chlorite schist, and calc-schist of Devonian age (Nokleberg and Aleinikoff, 1985; Lange and others, 1993). The deposit is generally stratabound and consists mainly of pyrrhotite and pyrite. Chalcopyrite, sphalerite, and galena locally occur in fairly sparsely distributed pods, disseminations, and vein-like zones. The pods are as much as about 3 feet across. Samples collected during a 1980's U.S. Geological Survey reconnaissance contained as much as 0.5 percent zinc, 0.43 percent copper; and 0.017 percent lead. Trace elements in the mineralized rocks include as much as 50 parts per million (ppm) tin, 0.2 ppm gold, and 500 ppm cobalt (Nokleberg and others, 1991).
Workings: Re-examination of the prospect by American Copper and Nickel Company in 1993 indicated that pyrrhotite is the main sulfide and that base metal concentrations are generally low (W.T. Ellis, unpublished data, 1993).
Age: Devonian, the age of the host strata.
Commodities (Major) - Cu, Zn; (Minor) - Ag, Au, Co, Pb, Sn
Development Status: None
Deposit Model: Kuroko massive sulfide (Cox and Singer, 1986; model 28a).
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
5 valid minerals.
Detailed Mineral List:
| β Chalcopyrite Formula: CuFeS2 |
| β Galena Formula: PbS |
| β Pyrite Formula: FeS2 |
| β Pyrrhotite Formula: Fe1-xS |
| β Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| β | Sphalerite | 2.CB.05a | ZnS |
| β | Chalcopyrite | 2.CB.10a | CuFeS2 |
| β | Pyrrhotite | 2.CC.10 | Fe1-xS |
| β | Galena | 2.CD.10 | PbS |
| β | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | β Chalcopyrite | CuFeS2 |
| S | β Galena | PbS |
| S | β Pyrite | FeS2 |
| S | β Pyrrhotite | Fe1-xS |
| S | β Sphalerite | ZnS |
| Fe | Iron | |
| Fe | β Chalcopyrite | CuFeS2 |
| Fe | β Pyrite | FeS2 |
| Fe | β Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | β Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | β Sphalerite | ZnS |
| Pb | Lead | |
| Pb | β Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MH005 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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References
