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Ankle Creek prospect, Alaska Peninsula District, Aleutians East Borough, Alaska, USA

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Latitude & Longitude (WGS84): 55° 11' 20'' North , 160° 39' 17'' West
Latitude & Longitude (decimal): 55.18889,-160.65500
KΓΆppen climate type:Dfc : Subarctic climate


This prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Location: The map site of the Ankle Creek prospect is at an elevation of 600 feet, about 1,000 feet north-northwest of the center of sec. 3, T. 58 S., R. 75 W., Seward Meridian. The location is accurate to within 1,200 feet.
Geology: The Ankle Creek quartz vein is parallel to the Surprise vein (PM089), and crops out approximately 200 feet to the southeast. It is as much as 50 feet in width and has been exposed for 130 feet on strike. Based on float, air photo lineaments, and ground magnetics, the Ankle Creek vein has been traced for approximately 1,200 feet to the northeast where it intersects the Amethyst vein (PM092) (Peterson and others, 1982, figure 11). The vein is hosted in andesite flows which belong to the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The flows exhibit propylitic alteration near the vein. Pyrite apparently is widespread. Two trenches have been cut across the vein at its southwest end. Float samples of vein material assayed as much as 0.30 ounce of gold and 0.60 ounce of silver per ton (Trujillo and others, 1981). The best trench sample assayed 0.014 ounce of gold and 0.03 ounce of silver per ton over 12 feet. This includes a 5-foot interval grading 0.048 ounce of gold and 0.03 ounce of silver per ton. Assays from the other trench were 0.003 ounce of gold and 0.02 ounce of silver per ton over 7 feet, and 0.005 ounce of gold and 0.04 ounce of silver per ton over 3 feet. The assays also show varying amounts of copper, lead, zinc, and mercury. Three holes were drilled to intersect the vein at depth. Apparently only one hole (AQANK-2) was successful. Where intersected, the vein had narrowed to 8 feet and was almost entirely devoid of gold (Trujillo and others, 1981).

Workings: During the period 1979 to 1981 Resource Associates of Alaska mapped and sampled the prospect, conducted a magnetic survey, cut two trenches, and drilled three core holes (Trujillo and others, 1981). Float samples assayed as much as 0.30 ounce of gold per ton, whereas the best in-place metal values were from a 12-foot-long trench sample that assayed 0.014 ounce of gold per ton.

Age: Eocene or younger.

Alteration: Andesite host rocks are propylitically altered.

Commodities (Major) - Ag, Au; (Minor) - As, Cu, Hg, Pb, Zn

Development Status: None

Deposit Model: Epithermal gold vein


Commodity List

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


Mineral List


3 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Miocene
5.333 - 23.03 Ma



ID: 3193007
Cenozoic sedimentary rocks

Age: Miocene (5.333 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Eocene - Tertiary
33.9 - 66 Ma



ID: 1709301
Meshik Volcanics and similar rock units

Age: Paleogene (33.9 - 66 Ma)

Stratigraphic Name: Meshik Volcanics

Description: Popof volcanic rocks, only in Shumagin Islands = Meshik

Lithology: Igneous

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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

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Anderson, G.L., Butherus, D.L., Fankhauser, R.E., Pray, J.C., Lindberg, P.A., and Hoffman, B.L. (1980), Exploration and evaluation of lands leased from Aleut Native Corporation 1980: Resource Associates of Alaska Report, 84 p, 16 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.).
Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E. (1982), Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.).
Trujillo, R.S., Anderson, G., MacLeod, T., Hendrick, K., Farnham, S., Peterson, J. (1981). Exploration and evaluation of the Unga-Popof-Korovan Islands portion of lands leased from Aleut Native Corporation: Resource Associates of Alaska report, 70 p., 38 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.).
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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