| Main commodities | Cu; Fe |
|---|---|
| Other commodities | W |
| Ore minerals | chalcopyrite; pyrite; sphalerite; wolframite |
| Gangue minerals | diopside; epidote; garnet; wollastonite |
| Quadrangle map, 1:250,000-scale | MZ |
|---|---|
| Quadrangle map, 1:63,360-scale | A-4 |
| Latitude | 65.0664 |
| Longitude | -154.6225 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | 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. |
Geologic descriptionThe 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]). | |
| Geologic map unit | (-154.625019337363, 65.0658209229787) |
|---|---|
| Mineral deposit model | Cu skarn (Cox and Singer, 1986; model 18b) |
| Mineral deposit model number | 18b |
| Age of mineralization | 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 of deposit | Metasomatism of carbonate-bearing rocks. |
| Workings or exploration | 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]). |
|---|---|
| Indication of production | None |
Additional commentsThis prospect is on land selected by Doyon, Limited. For further information, contact Doyon, Limited, 1 Doyon Place, Suite 300, Fairbanks, Alaska 99701-2941. | |
ReferencesDiMarchi, 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).
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| Reporters | G.E. Graham, D.J. Szumigala (Alaska Division of Geological and Geophysical Surveys) |
|---|---|
| Last report date | 1/10/2005 |