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Unnamed Occurrence (ARDF - NB002; southwest of Indian Pass Lake), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - NB002; southwest of Indian Pass Lake)- not defined -
Chistochina Mining DistrictMining District
Valdez-Cordova Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
62° 48' 23'' North , 143° 59' 16'' West
Latitude & Longitude (decimal):
62.80639,-143.98778
GeoHash:
G#: bg1t73x39
GRN:
N42W51
Köppen climate type:
Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Slana147 (2011)11.1km
Mentasta Lake112 (2011)16.9km
Mindat Locality ID:
201376
Long-form identifier:
mindat:1:2:201376:6
GUID (UUID V4):
0


Location: This occurrence is on a ridge between two unnamed west tributaries of Porcupine Creek. It is close to a saddle at an elevation of about 4,700 feet, about 1.1 miles west of the Eagle trail, in the SW1/4 of section 19, T. 12 N., R. 8 E. of the Copper River Meridian. This is locality 1 of Richter and others (1975). It is located to within several hundred feet. Cobb and Richter (1980) included this occurrence under the name 'Indian Pass Lake'.
Geology: Disseminated pyrite and small quartz-pyrite veins occur in a small hornblende diorite stock that intrudes late Paleozoic andesitic rocks of the Tetelna Volcanics (Richter, 1966, 1976; Richter and others, 1975). A sample of hornblende diorite with minor disseminated pyrite from this locality contained 0.3 part per million gold (sample R60, Richter and Matson, 1968). Plutonic rocks in this area are part of a Pennsylvanian magmatic suite that varies from gabbro to granite and has U-Pb zircon ages between 290 and 320 Ma (Richter, Lanphere, and Matson, 1975; Miller, 1994, p. 541-542).
Age: Probably Pennsylvanian, the age of plutonic rocks in the area.
Alteration: Oxidation; pyrite-bearing rocks in this area are commonly limonite-stained (Richter, 1966).

Commodities (Major) - Au
Development Status: No
Deposit Model: Polymetallic veins and/or porphyry Cu-Au (Cox and Singer, 1986; models 22c and

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


3 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘ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ⓘ PyriteFeS2
FeIron
Feⓘ PyriteFeS2
AuGold
Auⓘ GoldAu

Other Databases

Link to USGS - Alaska:NB002

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., and Richter, D.H., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Nabesna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-927, 117 p. Miller, T.P., 1994, Pre-Cenozoic plutonic rocks in mainland Alaska, in Plafker, George, and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, Vol. G-1, p. 535-554. Richter, D.H., 1966, Geology of the Slana district, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 54 p., 3 sheets, scale 1:63,360. Richter, D.H., 1976, Geologic map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-932, 1 sheet, scale 1:250,000. Richter, D.H., and Matson, N.A., Jr., 1968, Distribution of gold and some base metals in the Slana area, eastern Alaska Range, Alaska: U.S. Geological Survey Circular 593, 20 p. Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, 1 sheet, scale 1:250,000. Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.
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