Unnamed (south of the north fork of the East Fork Chandalar River) (ARDF #CH036) Cu, Zn

Unnamed (south of the north fork of the East Fork Chandalar River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu; Zn

Geographic location

Quadrangle map, 1:250,000-scale	CH
Quadrangle map, 1:63,360-scale	C-1
Latitude	67.68
Longitude	-147.05
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 3,200 ft, approximately 15 miles northeast of the east end of Ackerman Lake and 3 miles south of the north fork of the East Fork Chandalar River near the eastern boundary of the Chandalar quadrangle (secs. 15 and 22, T. 33 N., R. 3 W., of the Fairbanks Meridian). The reference point is near the center of a large northeast-southwest-trending claim block which extends 2 to 3 miles in both directions from the reference point. This occurrence is listed in DeYoung (1978) as North Fork East Fork Chandalar River (loc. 52) and in Maas (1987 , OFR 10-87 (location 29) as Chandalar River NFEF. See additional comments for further information. The location is accurate within a 1-mile radius.

Geologic setting

Geologic description There is little descriptive information on this occurrence. DeYoung (1978) described the occurrence as a stratabound(?) Cu-Zn prospect, and Barker (1978, loc. 11) reported that copper values appear to be related to Upper Devonian black metaclastic rocks adjacent to, or under, a thrust unit of Skajit Limestone. Geologic mapping shows the area to be underlain principally by Devonian(?) Hunt Fork Shale black slate, phyllite, and phyllitic siltstone, Devonian limestone and siltstone, and a thrust slice of the Skajit Limestone (Brosgé and Reiser, 1964). A basal conglomerate(?) of the Hunt Fork Shale has been mapped locally in the area.
Geologic map unit	(-147.052741925418, 67.6796458833049)

Geologic description

There is little descriptive information on this occurrence. DeYoung (1978) described the occurrence as a stratabound(?) Cu-Zn prospect, and Barker (1978, loc. 11) reported that copper values appear to be related to Upper Devonian black metaclastic rocks adjacent to, or under, a thrust unit of Skajit Limestone. Geologic mapping shows the area to be underlain principally by Devonian(?) Hunt Fork Shale black slate, phyllite, and phyllitic siltstone, Devonian limestone and siltstone, and a thrust slice of the Skajit Limestone (Brosgé and Reiser, 1964). A basal conglomerate(?) of the Hunt Fork Shale has been mapped locally in the area.

Geologic map unit

(-147.052741925418, 67.6796458833049)

Production and reserves

Workings or exploration	Barker (1978) reported 202 claims located in 1975 (ACH and CHA groups), accompanied by exploration that included drilling, which was continuing in 1978. DeYoung (1978) reports 118 claims staked in 1976. Ninety-three are in the Chandalar quadrangle; the remaining 25 extend east into the Christian quadrangle.
Indication of production	None
Additional comments Little information is available about this site. Location 11 in Barker (1978) is on a very small scale map, but it is reasonably coincident with loc. 52 on DeYoung's (1978) map. The locations herein are considered equivalent. The claim block outline is shown on U.S. Bureau of Mines (1973) mineral location overlay. It also corresponds to location 29 on their later version of the mineral location overlay (Maas, 1987, USBM OFR 10-87). Alaska Kardex No. 031-070 (Kardex is a card file mining claim information system located at the State of Alaska DNR Public Information Center in Fairbanks).

References

MRDS Number	A012559
References Barker, J.C., 1978, Mineral investigations of certain lands in the eastern Brooks Range: A Summary Report: U.S. Bureau of Mines Open-File Report 63-78, 25 p., 5 sheets, scale 1:1,000,000. DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000. Maas, K.M., 1987, Maps summarizing land availability for mineral exploration and development in northern Alaska, 1986: U.S. Bureau of Mines Open-File Report 10-87, 33 quadrangle overlays. U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).
Reporters	J.M. Britton (Anchorage)
Last report date	11/17/1999