Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Big River Occurrence, Bristol Bay Mining District, Kenai Peninsula Borough, Alaska, USAi
Regional Level Types
Big River OccurrenceOccurrence
Bristol Bay Mining DistrictMining District
Kenai Peninsula BoroughBorough
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
58° 40' 48'' North , 153° 52' 11'' West
Latitude & Longitude (decimal):
58.68000,-153.86972
GRN:
N40W59
Type:
Occurrence
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
196507
Long-form identifier:
mindat:1:2:196507:3
GUID (UUID V4):
0


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 Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


5 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘMolybdenite2.EA.30MoS2
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2

List of minerals for each chemical element

OOxygen
Oⓘ QuartzSiO2
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ MolybdeniteMoS2
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2
ZnZinc
Znⓘ SphaleriteZnS
MoMolybdenum
Moⓘ MolybdeniteMoS2

Other Databases

Link to USGS - Alaska:AF002

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Church, S.E., Riehle, J.R., and Goldfarb, R.J., 1994, Interpretation of exploration geochemical data for the Mount Katmai quadrangle, and adjacent parts of the Afognak and Naknek quadrangles, Alaska: U.S. Geological Survey Bulletin 2020, 67 p., 3 plates, scale 1:250,000. Church, S.E., Riehle, J.R, Magoon, L.B., and Campbell, D.L., 1992, Mineral and energy resource assessment maps of the Mount Katmai, Naknek, and western Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 2021-F, 22 p., 2 sheets, scale 1:250,000. Riehle, J.R., Detterman, R.L., Yount, M.E., and Miller, J.W., 1993, Geologic map of the Mount Katmai quadrangle and adjacent parts of the Naknek and Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2204, 1 sheet, scale 1:250,000.
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