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Pennsylvania; Keystone Prospects, Kantishna District, Denali Borough, Alaska, USA

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Latitude & Longitude (WGS84): 63° 32' 34'' North , 150° 55' 33'' West
Latitude & Longitude (decimal): 63.5427777778, -150.925833333

The claims are in Denali National Park and Preserve.
Location: The Pennsylvania and Keystone prospects are on patented, adjacent claims in the canyon of Iron Gulch, a south-flowing tributary to Eureka Creek. The location is at the center of the end line between the two claims. It is about 150 feet west of Iron Gulch, and about 0.24 mile west-northwest of the center of section 7, T. 16 S., R. 17 W., Fairbanks Meridian. The location is accurate within 300 feet. The prospects are number 30 of Bundtzen (1981) and 39 of Thornsberry, McKee, and Salisbury (1984), and are included in location 12 of MacKevett and Holloway (1977).
Geology: The area of the Pennsylvania-Keystone claims is underlain mainly by 'quartz-eye' metafelsite of the Spruce Creek sequence (Thornsberry, McKee, and Salisbury, 1984, fig. K-2; v. 2 occurrence 39; Hawley and Associates, 1978, fig. 4.1-(A)1). The claims are close to the axis of the Kantishna antiform (see record MM091). Two main veins, the Pennsylvania and the Keystone, have been explored on the claims. The Pennsylvania vein crosses the west end line of the Pennsylvania claim about 100 feet north of the center of the claim. The vein strikes N 65 E and dips 85 S. It continues easterly (uphill) for about 500 feet and strikes toward the Pittsburgh vein (MM109), with which it probably correlates (Davis, 1923, p. 129; Thornsberry, McKee, and Salisbury, 1984, v. 2, no. 39). The Keystone vein is about 100 feet south of the Pennsylvania vein at the west end of the Pennsylvania claim. It strikes about N 50 E, and dips 60 S. The Keystone vein continues southwest for about 800 feet on the Keystone claim, and intersects the Pennsylvania vein on the Pennsylvania claim. Its total strike length is at least 1200 feet. A third vein, which crops out between the Pennsylvania and Keystone veins, appears to intersect both of the them (Davis, 1923, p. 130), and a fourth vein is suggested by quartz float near the north boundary of the claims (Thornsberry, McKee, and Salisbury, 1984, v. 2, no. 39). The Pennsylvania vein consists mainly of quartz and calcite, and contains pyrite and free gold. The Keystone vein consists mainly of quartz, along with arsenopyrite and pyrite and lesser amounts of galena and sphalerite (Capps, 1919, p. 122-23). Spectacular dendritic gold occurred in a shallow pit on a thin quartz vein that may be part of the Keystone vein (Capps, 1919; Davis, 1923, p. 130; Moffit, 1933, p. 131-132). Other minerals in the veins include chalcopyrite, scorodite, jamesonite(?), tetrahedrite, and scheelite (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984).
Workings: The veins were explored by numerous open cuts, short adits, and shafts, currently (2001) mostly inacessable. Considerable development occurred prior to 1922 (Davis, 1923), and a little work was done in subsequent years. In 1983, the U.S. Bureau of Mines drilled three diamond core holes (K-8, -9, and -10). Between 132 and 135 feet, drill hole K-8 intersected vein quartz, chalcedonic quartz and dolomite, and mineralized metafelsite. Core recovery was only fair, and one section was lost. The best intersection was 147 to 150 feet, which assayed 0.294 ounce of gold per ton and 0.276 ounce of silver per ton. From 34.5 to 43.5 feet, drill hole K-9 intersected quartz-dolomite vein material and possible stope fill that assayed 0.10 ounce of gold per ton. Hole K-10 intersected quartz-dolomite-ankerite(?) vein material containing traces of gold and silver. Drill hole K-8 probably intersected the Pennsylvania vein (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 39 and drill logs).
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Oxidation of arsenopyrite to scorodite.
Production: Production is unknown but small quantities of dendritic gold were almost certainly taken from the claims.

Commodities (Major) - Au; (Minor) - Ag, Cu, Pb, W, Zn
Development Status: Undetermined.
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).

Mineral List

11 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

358.9 - 419.2 Ma
Pelitic and quartzose schist of the Alaska Range

Age: Devonian (358.9 - 419.2 Ma)

Description: Pelitic and quartzose schist sequence

Lithology: Metamorphic

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]

Devonian - Cambrian
358.9 - 541 Ma
Sedimentary; Sedimentary: undivided

Age: Paleozoic (358.9 - 541 Ma)

Description: Eastern Alaska, Yukon, Mackenzie region, Yukon-Tanana upland

Comments: Orogen, magmatic arc/suite; Wilson & Hults, unpublished compilation, 2007-08

Lithology: Sandstone, siltstone, shale, limestone or metamorphosed equivalent

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

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

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Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p. Capps, S. R., 1919, The Kantishna region, Alaska: U. S. Geological Survey Bulletin 687, 116 p. Cobb, E. H., 1972, Metallic mineral resources map of the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Miscellaneous Field Studies Map MF-366, 1 sheet, scale 1:250,000. Cobb, E.H., 1980, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Open-File Report 80-363, 150 p. Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p. Davis, J. A., 1923, The Kantishna region, Alaska, in Stewart, B. D., Annual Report of the Mine Inspector to the Governor of Alaska, 1922: Alaska Division of Geological and Geophysical Surveys AR-1922. Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections). MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. Moffit, F. H., 1933, The Kantishna district: U. S. Geological Survey Bulletin 836, p. 301-338. Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.

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