Dieter; Cape Mountain Prospect, Port Clarence District, Nome Borough, Alaska, USA
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Geology: The Cape Mountain (Dieter) prospect is a 418 foot-long adit, now caved, driven S 72 W to intersect an area of quartz veining in the Late Cretaceous (78.8 +/- 2.9 my; Hudson and Arth, 1983, p. 769) Cape Mountain biotite granite. The prospect is near the summit of Cape Mountain which is a roof pendant of marble and interlayered schist (Sainsbury, 1972). Steidtmann and Cathcart (1922, p. 99) reported finding cassiterite-bearing quartz vein material on the adit dump but a later effort by Mulligan (1966, p. 33) was unsuccessful in duplicating this result. The area of the prospect is in a part of the Cape Mountain biotite granite (Hudson and Arth, 1983) that has characteristics of a precursor phase rather than a mineralizing phase (Hudson and Reed, 1997, figure 3).
Workings: An adit was driven 418 feet S 72 W from a portal at 1700 feet elevation on the north side of the summit to Cape Mountain. Other surface prospect pits and short shafts were dug in the area.
Age: Late Cretaceous; cassiterite and related mineralization in this area is interpretated to be linked to the evolution of the Cape Mountain granite which has been determined to be 78.8 +/- 2.9 my old by the K/Ar method (Hudson and Arth, 1983, p. 769). .
Alteration: Alteration has not been described.
Commodities (Major) - Sn
Development Status: None
Deposit Model: Cassiterite-quartz vein in granite (Cox and Singer, 1986; model 15b?)
2 entries listed. 2 valid minerals.
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Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-587, 130 p. Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Teller quadrangle, Alaska; Supplement to Open-File Report 75-587; Part A, Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-364-A, 25 p. Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Teller quadrangle, Alaska; Supplement to Open-File Report 75-587; Part B, Lists of references to January 1, 1980: U.S. Geological Survey Open-File Report 81-364-B, 25 p. Cobb, E.H., and Sainsbury, C.L., 1972, Metallic mineral resources map of the Teller quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-426, 1 sheet, scale 1:250,000. Collier, A.J., 1904, Tin deposits of the York region, Alaska: U.S. Geological Survey Bulletin 229, 61 p. Harrington, G.L., 1919, Tin mining in Seward Peninsula: U.S. Geological Survey Bulletin 692-G, p. 353-361. Heide, H.E., Wright, W.S., and Sanford, R.S., 1946, Exploration of Cape Mountain lode-tin deposits, Seward Peninsula, Alaska: U.S. Bureau of Mines Report of Investigations 3978, 16 p. Hess, F.L., 1906, The York tin region, in Brooks, A.H., and others, Report on progress of investigations of mineral resources in Alaska in 1905: U.S. Geological Survey Bulletin 284, p. 145-157. Hudson, T.L., 1984, Tin systems of Seward Peninsula, Alaska: Anchorage, Anaconda Minerals Company internal report, 51 p. (Report held by Cook Inlet Region Inc., Anchorage, Alaska) Hudson, T.L., and Arth, J. G., 1983, Tin granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790. Knopf, Adolph, 1908, Geology of the Seward Peninsula tin deposits, Alaska: U.S. Geological Survey Bulletin 358, 71 p. Mulligan, J.J., 1966, Tin-lode investigations, Cape Mountain area, Seward Peninsula, Alaska; with a section on petrography by W.L. Gnagy: U.S. Bureau of Mines Report of Investigations 6737, 43 p. Sainsbury, C.L., 1972, Geologic map of the Teller quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Map I-685, 4 p., 1 sheet, scale 1:250,000. Steidtmann, Edward, and Cathcart, S. H., 1922, Geology of the York tin deposits, Alaska: U.S. Geological Survey Bulletin 733, 130 p.