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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Unnamed Occurrence (ARDF - MH057; west of West Fork Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - MH057; west of West Fork Maclaren River)- not defined -
Valdez Creek Mining DistrictMining District
Matanuska-Susitna BoroughBorough
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
63° 13' 31'' North , 146° 48' 3'' West
Latitude & Longitude (decimal):
63.22528,-146.80083
GeoHash:
G#: bepxemycu
GRN:
N43W49
Köppen climate type:
ET : Tundra
Mindat Locality ID:
201196
Long-form identifier:
mindat:1:2:201196:0
GUID (UUID V4):
0


Location: This occurrence is at an elevation of about 4,300 feet on the south side of an east-flowing tributary to the West Fork Maclaren River, in the SE1/4 NW1/4 section 33, T. 19 S., R. 5 E., Fairbanks Meridian. The occurrence corresponds to locality 11 in figure 4 of Cobb (1979 [OFR 79-238]) and to locality 16 in table 2 of Nokleberg and others (1991).
Geology: The rock at this occurrence is propylitized basalt and andesite of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1982, 1991). Mineral deposits at the occurrences are quartz-epidote veins from 2 to 6 inches wide in a minor fault zone. The veins contain local concentrations of primary chalcocite, pyrrhotite, covellite (?), and secondary malachite (Smith and others, 1973, location B). Copper deposits hosted in the Nikolai Greenstone typically contain small amounts of silver.
Workings: Natural outcrops and float.
Age: Probably Cretaceous or early Tertiary (see MH060).
Alteration: Nikolai Greenstone is propylitized.

Commodities (Major) - Cu; (Minor) - Ag
Development Status: None
Deposit Model: Basaltic Cu (Cox and Singer, 1986, model 23).

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


6 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘCovellite2.CA.05aCuS
ⓘPyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)

List of minerals for each chemical element

HHydrogen
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ MalachiteCu2(CO3)(OH)2
CCarbon
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ QuartzSiO2
AlAluminium
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
SiSilicon
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ QuartzSiO2
SSulfur
Sⓘ ChalcociteCu2S
Sⓘ CovelliteCuS
Sⓘ PyrrhotiteFe1-xS
CaCalcium
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
FeIron
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ PyrrhotiteFe1-xS
CuCopper
Cuⓘ ChalcociteCu2S
Cuⓘ CovelliteCuS
Cuⓘ MalachiteCu2(CO3)(OH)2

Other Databases

Link to USGS - Alaska:MH057

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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

Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p. Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1992, Mineral investigations in the Valdez Creek mining district, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 659 p., 2 plates, scale 1:250,000. Nokleberg, W.J., Albert, N.R.D., Bond, G.C., Herzon, P.L., Miyaoka, R.T., Nelson, W.H., Richter, D.H., Smith T.E., Stout, J.H., Yeend, Warren, and Zehner, R.E., 1982, Geologic map of the southern Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 82-52, 27 p., 1 sheet,scale 1:250,000. Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000. Smith, T.E., Trible, T.C., and Stein, D.R., 1973, Analyses of rock and stream-sediment samples, Mt. Hayes A-6 quadrangle, south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geochemical Report 26, 1 plate, scale 1:63,360. Stout, J.H., 1976, Geology of the Eureka Creek area, east-central Alaska Range: Alaska Division of Geological and Geophysical Surveys Geologic Report 46, 32 p., 1 plate, scale 1:63,360.
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