Unnamed Prospect (ARDF - MZ024; head of Glacier Creek), Melozitna District, Yukon-Koyukuk Borough, Alaska, USA
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Location: This lode prospect is at the head of Glacier Creek, a north-flowing tributary of Hot Springs Creek, in the southwestern part of the Kokrines Hills. The site is at an elevation of 2,700 feet, about 0.2 mile south-southwest of the center of section 9, T. 5 S., R. 21 E., Kateel River Meridian.
Geology: The upper part of Glacier Creek is underlain by pre-Cretaceous, amphibolite-grade granite and granodiorite gneiss, with subordinate dolomitic marble, micaceous quartzite, quartz-mica schist, and biotite amphibolite (Patton and others, 1977; Dillon and others, 1983). The rocks are intruded by mid- Cretaceous granite of the Melozitna pluton, which is cut by tourmaline-bearing pegmatite and aplite dikes (Dillon and others, 1983; DiMarchi and others, 1991). Mineralization consists of carbonate-hosted skarn that contains sparse chalcopyrite, pyrrhotite, wolframite, and possibly sphalerite in a matrix of garnet, epidote, diopside, and wollastonite (DiMarchi and others, 1991; North Star Exploration, Inc., 1999 [DLR 99-33]). One rock sample contained up to 6 percent combined pyrrhotite and chalcopyrite. Mineralized rock samples contained as much as 824 parts per million (ppm) copper, 1,358 ppm zinc, and 230 ppm tungsten. No anomalous gold values are reported. The Glacier Creek prospect has been interpreted as a calc-silicate skarn in a roof pendant over the Melozitna pluton (North Star Exploration Inc., 1999 [DLR 99-33]). This prospect is within areas of geochemical sampling programs over land block 18 of Doyon Limited. Work was done here by WGM, Inc. in 1975-77 and 1979; by Central Alaska Gold Co. in 1989 and 1990; and by North Star Exploration, Inc. in 1998 (North Star Exploration Inc., 1999 [DLR 99-33]).
Workings: This prospect is within areas of geochemical sampling programs over land block 18 of Doyon Limited. Work was done here by WGM, Inc. in 1975-77 and 1979; by Central Alaska Gold Co. in 1989 and 1990; and by North Star Exploration, Inc. in 1998 (North Star Exploration Inc., 1999 [DLR 99-33]).
Age: Mid-Cretaceous or younger, on the basis of a K-Ar radiometric date of 111 +/- 3 Ma on the Melozitna pluton that is probably related to the mineralization of this prospect (Patton and others, 1977).
Alteration: Metasomatism of carbonate-bearing rocks.
Commodities (Major) - Cu, Fe; (Minor) - W
Development Status: None
Deposit Model: Cu skarn (Cox and Singer, 1986; model 18b)
8 entries listed. 6 valid minerals.
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Dillon, J.T., Adams, D.D., Adler, Penny, 1983, Geologic map of the Melozitna A-4 Quadrangle, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 83-18, 1 sheet, scale 1:63,360. DiMarchi, J.J., Weglarz, T.B., Dickey, C.F., Laux, D.P., Smith, M.T., Toro, J., and Kurtz, J.P., 1991, Central Alaska Gold Co. 1990 annual report, Alaska field operations - Doyon option volume 7 plates, Fortymile central, Fortymile south, mid-Yukon, Nikolai, and East Holy Cross blocks: Doyon, Ltd. Report 91-8d. (Report held by Doyon, Ltd., Fairbanks, Alaska). North Star Exploration Company, 1999, North Star 1998 Annual Report, Block 18, Middle Yukon, DLR 99-33 (Report held by Doyon, Limited, Fairbanks, Alaska). Patton, W.W., Jr., Miller, T.P., Chapman, R.M., and Yeend, W., 1977, Geologic map of the Melozitna quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-147, 1 sheet, scale 1:250,000.