| Quadrangle map, 1:250,000-scale | CH |
|---|---|
| Quadrangle map, 1:63,360-scale | D-5 |
| Latitude | 67.7707 |
| Longitude | -149.0532 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The Mike prospect is on the hillside just east of the last bend at the head of Robert Creek and about 1.3 miles northwest of peak 5150. It is about 0.3 east of the center of section 14, T. 34 N., R. 7 W. Kurtak and others (2002) include a map showing the regional geology of the area and the location of this and the other deposits of the Chandalar Copper Belt. |
Geologic descriptionThe Mike prospect was staked by Placid Oil Company in 1972 and explored by them until 1977 (Kurtak and others, 2002). The prospect was one of the deposits listed in a report by Ventures Resources Corp. (1999) about their exploration of the Chandalar Copper Belt. The Mike prospect is at the northeast end of the Chandalar Copper Belt. The rocks in the vicinity are Devonian calcareous schist and marble, in thrust contact with Devonian Hunt Fork Shale, Skajit Limestone, and greenschist (Brosgé and Reiser, 1964). The prospect consists of an outcrop of quartz-epidote skarn about 20 feet by 50 feet in area (Kurtak and others, 2002) A select sample contained 29 parts per billion gold, 0.8 parts per million (ppm) silver, and 167 ppm copper. Kurtak and others (2002) searched the area between the Mike prospect and the Pilgrim prospect (CH099), about 1.5 miles to the south-southeast, but found little outcrop and no skarn. Newberry and others (1986) classify the Mike prospect as a copper (-zinc-silver) skarn, and Newberry and others (1997) classify it as a calcic copper skarn. | |
| Geologic map unit | (-149.055962769439, 67.770305442482) |
|---|---|
| Mineral deposit model | Cu skarn deposits (Cox and Singer, 1986; model 18b). |
| Mineral deposit model number | 18b |
| Age of mineralization | Devonian(?) based on Early Devonian Pb/Pb zircon ages from the nearby Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996). |
| Alteration of deposit | Local development of masses of skarn in calcareous rocks. |
| Workings or exploration | The Mike prospect was staked by Placid Oil Company in 1972 and explored by them until 1977 (Kurtak and others, 2002). The prospect was one of the deposits listed in a report by Ventures Resources Corp. (1999) about their exploration of the Chandalar Copper Belt. |
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| Indication of production | None |
| Reserve estimates | None. |
| Production notes | None. |
Additional commentsThis prospect is on Doyon Ltd. selected lands; for more information, contact Doyon Ltd., Fairbanks, Alaska. MAS No. 0020310101 | |
ReferencesKurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
Newberry, R.J., Allegro, G.L., Cutler, S.E., Hagen-Levelle, D.D., Adams, D.D., Nicholson, L.C., Weglarz, T.B., Bakke, A.A., Clautice, K.H., Coulter, G.A., Ford, M.J., Myers, G.L., and Szumigala, D.J., 1997, Skarn deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 355-395.
Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
Nicholson, L.M., 1990, Porphyry copper, copper skarn, and volcanogenic massive sulfide occurrences in the Chandalar copper district, Alaska: Fairbanks, University of Alaska, M.Sc. thesis, 164 p.
Ventures Resource Corp., 1999, 1999 Annual Report: Ventures Resource Corporation, 36 p.
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| Reporters | J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey) |
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| Last report date | 4/18/2010 |