Unnamed Occurrence (ARDF - WI081; ridge east of Scofield Creek), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - WI081; ridge east of Scofield Creek) | - not defined - |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 19' 40'' North , 151° 18' 39'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201943
Long-form identifier:
mindat:1:2:201943:0
GUID (UUID V4):
aadf6a35-c130-4920-aaa7-74d49180f67b
Location: This occurrence is between Scofield and Michigan Creeks, about 7.5 miles west of Ipnek Mountain and 2.8 miles northeast of the junction of Scofield Creek and Wild River. The occurrence is at an elevation of about 3,550 feet, about 0.5 mile north-northeast of the center of section 22, T. 29 N., R. 17 W., of the Fairbanks Meridian. The location is accurate.
Geology: This occurrence consists of a gossan zone at the contact of calc-schist and marble with granite. A sample of float from the gossan contains up to 20 ppm silver, 1,000 ppm arsenic, 1,500 ppm lead, 1,800 ppm zinc, 20% iron, and 0.5% barium. (Dillon and others, 1981, sample 380 [AOF 133B]). No sulfides were observed in the sample. Kurtak and others (2002) collected a sample of limonite-stained muscovite schist float in this area that contains 129 ppm lead, and 391 ppm arsenic. About a mile to the west, Dillon and others (1981, no. 127) collected a sample of quartz-monzonite gneiss in contact with calc-schist and skarn. This sample contains about 3% unspecified, partly oxidized, sulfides, apparently of replacement origin. This sample contains about 200 ppm lanthanum but no other anomalous metal values. The rocks in the area are granite gneiss of the Devonian Wild River Pluton, which intrudes Proterozoic or lower Paleozoic(?) schist of varying types with some marble. (Dillon and others, 1986).
Workings: Six claims (EPI 1-6) were located by Canevex, Inc. in this area in 1975 but no other information on the claims is available (Kurtak and others, 2002).
Alteration: Iron-staining.
Commodities (Major) - Ag, Pb, Zn; (Minor) - As, Ba, Fe
Development Status: None
Deposit Model: Zn-Pb skarn deposit(?) (Cox and Singer, 1986; model 18c)
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | WI081 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Brooks Range DomainDomain
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References
