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Andronica occurrence, Aleutians East Borough, Alaska, USAi
Regional Level Types
Andronica occurrenceOccurrence
Aleutians East BoroughBorough
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
55° 19' 50'' North , 160° 4' 44'' West
Latitude & Longitude (decimal):
55.33083,-160.07889
GRN:
N37W68
Type:
Occurrence
Nearest Settlements:
PlacePopulationDistance
Sand Point1,064 (2017)26.6km
Mindat Locality ID:
196281
Long-form identifier:
mindat:1:2:196281:2
GUID (UUID V4):
0


The site is located on land selected by the Aleut Corporation.
Location: This occurrence is at an elevation of about 1,100 feet on western Adronica Island. The map site is at the midpoint of the boundary between R70 and 71W, T56S, Seward Meridian, (Christie 1974, color anomaly 84; MacKevett and Holloway, 1977, locality 18; Wilson and others, 1988, locality 18). The location site is accurate.

Geology: This occurrence is in rocks mapped as Popof volcanic rocks of late Eocene to early Oligocene age (Wilson and others, 1995). It is marked by a color anomaly measuring about 6,000 feet by 1,000 feet (Christie, 1974). The anomaly is marked by pyritic-argillic alteration. The rocks include flat-lying flows, tuffs, and volcaniclastic sedimentary rocks (Ellis and Apel, 1989). Moderate pervasive pyritic alteration occurs in several areas. Rock, soil, and pan-concentrate samples outlined 2-square-mile area containing anomalous mercury values. Cinnabar and gold were noted in several pan-concentrate samples. Gold values in the 100-to 500-ppb range are common in the stream-sediment and soil samples. No rock samples contained anomalous gold values. Major north-to north-northwest-trending zones of shearing and faulting may in part, control the mineralization.

Workings: Battle Mountain Exploration Company explored this area from 1988 to 1989. They mapped, sampled, and prospected along six grid lines, and collected a total of 357 rock, soil, and pan-concentrate samples. They also ran magnetometer and VLF-EM surveys.

Age: Eocene or younger.

Alteration: Pyritic-argillic alteration has been noted.

Commodities (Major) - Au, Hg

Development Status: None

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
ⓘNative Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘCinnabar2.CD.15aHgS
ⓘPyrite2.EB.05aFeS2

List of minerals for each chemical element

SSulfur
Sⓘ CinnabarHgS
Sⓘ PyriteFeS2
FeIron
Feⓘ PyriteFeS2
AuGold
Auⓘ Native GoldAu
HgMercury
Hgⓘ CinnabarHgS

Other Databases

Link to USGS - Alaska:PM108

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
Pacific OceanOcean
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

Ellis, W.T., and Apel, R.A., 1989, Unga/Alaska Peninsula 1989 final report: Battle Mountain Exploration Company report, 41 p., 28 map sheets at various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.).
Christie, J.S. (1974), Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.).
MacKevett, E.M., Jr., and Holloway, C.D. (1977), Map showing metalliferous mineral deposits in the western part of southern Alaska: USGS Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
Wilson, F.H., White, W.H., and DuBois, G.D. (1988), Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: USGS Open-File Report 88-666, 128 p., 1 plate, scale 1:250,000.
Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E. (1995), Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: USGS Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000.
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