East Champion Prospect, Fortymile District, Southeast Fairbanks Borough, Alaska, USA
The East Champion prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.
Location: The East Champion prospect is located on a ridge east of the upper drainage of Champion Creek and about a mile south-southwest of hill 3870. The East Champion prospect is about 1 mile wide; the coordinates are its approximate center, in section 17, T. 4 S., R. 31 E., of the Fairbanks Meridian. The location is accurate. The East Champion prospect is located within Doyon, Ltd. selected or conveyed land.
Geology: The East Champion prospect is in Paleozoic quartz-mica schist, greenschist, biotite schist, quartzite, and marble (Foster, 1976). These units are intruded by granitic dikes, which may be related to plutons of Tertiary to Mesozoic age exposed 1 mile to the west or 1 mile to the southeast. Hornfelsing and other contact metamorphic features are common throughout the prospect. The East Champion prospect contains lead, tungsten, and silver geochemical anomalies in a contact metamorphic zone (WGM Inc., 1998 [DLR 98-12]). Stream-sediment samples are anomalous in lead (as much as 59 ppm). Soil samples contain as much as 168 ppm lead, 0.9 ppm silver, and 45 ppm tungsten. The anomalies occur in quartzite, pelitic schist, and marble. The marble is locally altered to diopside skarn with sparse galena and chalcopyrite. On the east end of the prospect area, a 100-m-long outcrop contains a 1.5-meter-thick marble bed with local alteration to calc-silicate rock and diopside skarn (U.S. Bureau of Mines, 1995). The skarn contains minor galena and chalcopyrite, but no scheelite was detected. Skarn is continuously exposed for approximately 60 meters along strike; small mineralized exposures have low base metal contents. A continuous chip sample across 0.3 meter of coarse-grained grossularite-epidote skarn contained 100 ppb gold, 4,733 ppm lead, and 2,060 ppm zinc. The East Champion prospect is on the periphery of a 'U'-shaped magnetic zone associated with contact metamorphism at the margins of an intrusion (WGM Inc., 1998 [DLR 98-12]). The prospect is located on a weak magnetic high associated with a zone of relatively high resistivity. Champion I (EA048), Champion II (EA049), North Champion (EA046), and Oregon Creek (EA045) are similar base-metal prospects within 5 miles of the East Champion prospect. Exploration by WGM Inc. in the area from 1975 to 1977 included reconnaissance geochemical sampling, follow-up prospecting, and selective soil sampling (Dashevsky and others, 1986). An airborne geophysical survey was flown in the area in 1997 (WGM Inc., 1998 [DLR 98-12]).
Workings: Exploration by WGM Inc. in the area from 1975 to 1977 included reconnaissance geochemical sampling, follow-up prospecting, and elective soil sampling (Dashevsky and others, 1986). An airborne geophysical survey was flown in the area in 1997 (WGM Inc., 1998 [DLR 98-12]).
Age: Lead isotopic ratios indicate a Late Cretaceous or early Tertiary age for the nearby Champion II mineralization (U.S. Bureau of Mines, 1995), which is similar to this prospect.
Alteration: A 100-m-long outcrop with a 1.5 m-thick marble bed in the east end of the prospect is locally altered to calc-silicate rock and diopside skarn (U.S. Bureau of Mines, 1995).
Commodities (Major) - Au, Pb, W, Zn; (Minor) - Ag
Development Status: None
Deposit Model: Cu skarn, Zn-Pb skarn (Cox and Singer, 1986; models 18b, 18c).
ReferencesDashevsky, S.S., Nicol, D.L., and Bond, J., 1986, Mines, prospects, and geochemical anomalies on Doyon Limited regional overselection lands, Alaska, Blocks 1-8: Doyon, Ltd. Report 86-01a, 300 p. (Report held by Doyon, Ltd., Fairbanks, Alaska). Lessman, J., and Holm, B., 1978, 1977 annual progress report, Doyon Project, Champion-Lead Creek area: Doyon, Ltd. Report 78-02. (Report held by Doyon, Ltd., Fairbanks, Alaska). U.S. Bureau of Mines, 1995, Final report of the mineral resource evaluation of the Bureau of Land Management Black River and Fortymile River Subunits: U.S. Bureau of Mines Open-File Report 79-95, 226 p. WGM Inc., 1998, Ventures Resource Alaska projects, 1997 progress report, Champion property exploration: Doyon, Ltd. Report 98-12, 64 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
| 'Garnet Group'|
5 entries listed. 4 valid minerals.
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