Big River Occurrence, Bristol Bay Mining District, Kenai Peninsula Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Big River Occurrence | Occurrence |
| Bristol Bay Mining District | Mining District |
| Kenai Peninsula Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 40' 48'' North , 153° 52' 11'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
196507
Long-form identifier:
mindat:1:2:196507:3
GUID (UUID V4):
dcc23c62-3e2e-4919-b6c9-94c3bad69066
Site is located in Katmai National Park.
Location: This site is northeast of the Big River on an unnamed tributary in sec. 26, T. 17 S., R. 28 E. (Church and others, 1992, sheet 1, locality 11). The location is accurate to within 1/2 mile.
Geology: At this site quartz-sulfide veins and disseminated sulfides occur in an altered Tertiary plug exposed in a creek drainage. Pyrite, chalcopyrite, sphalerite, and molybdenite are present in quartz veins up to 6 centimeters in width. Metal values run to greater than 20,000 ppm copper, and up to 2000 ppm zinc, 200 ppm lead, 200 ppm silver, 200 ppm cobalt, 100 ppm molybdenite, and 1.1 ppm gold (Church and others, 1994, table 15). Bedrock in this general area consists of sedimentary units of the Kaguyak Formation (Late Cretaceous) and sill-like and crosscutting Tertiary intrusive bodies of tonalite and granodiorite. This site occurs within a broad zone of geochemical anomalies located southwest of Fourpeaked Mountain and northeast of the mouth of Big River. Within this zone many silt samples are anomalous in arsenic, cobalt, copper, lead, and zinc (Church and others, 1994). Panned concentrates contain arsenopyrite, barite, chalcopyrite, pyrite, scheelite, sphalerite, and wulfenite. The site is also within a smaller zone of silts which are anomalous in boron, molybdenum, and tungsten.
Workings: Samples were collected and analyzed by the U.S. Geological Survey.
Age: The mineralization is associated with a small Late Tertiary stock.
Alteration: The intrusive rock at this site exhibits argillic and quartz-sericite alteration associated with abundant quartz veining.
Commodities (Major) - Cu; (Minor) - Ag, Au, Mo, Pb, Zn
Development Status: None
Deposit Model: Polymetallic vein, concealed porphyry copper or porphyry copper-molybdenum (Cox
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 Molybdenite Formula: MoS2 |
| β Pyrite Formula: FeS2 |
| β Quartz Formula: SiO2 |
| 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 | Molybdenite | 2.EA.30 | MoS2 |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | β Quartz | SiO2 |
| Si | Silicon | |
| Si | β Quartz | SiO2 |
| S | Sulfur | |
| S | β Chalcopyrite | CuFeS2 |
| S | β Molybdenite | MoS2 |
| S | β Pyrite | FeS2 |
| S | β Sphalerite | ZnS |
| Fe | Iron | |
| Fe | β Chalcopyrite | CuFeS2 |
| Fe | β Pyrite | FeS2 |
| Cu | Copper | |
| Cu | β Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | β Sphalerite | ZnS |
| Mo | Molybdenum | |
| Mo | β Molybdenite | MoS2 |
Other Databases
| Link to USGS - Alaska: | AF002 |
|---|
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References
