Arkansas Prospect, Kantishna Mining District, Denali Borough, Alaska, USAi

Regional Level Types
Arkansas Prospect	Prospect
Kantishna Mining District	Mining District
Denali Borough	Borough
Alaska	State
USA	Country

The prospect is in Denali National Park and Preserve.
Location: The Arkansas prospect (Cobb, 1980 [OFR 80-363]) is at an elevation of about 3450 feet on a minor east-trending ridge at the head of the West Fork of Glen Creek. It is in the SE 1/4 NE 1/4 section 2, T. 16 S., R. 17 W., Fairbanks Meridian. The location is probably accurate within 500 feet. The Arkansas prospect is 1500 feet downstream from the Pension (MM081) prospect (Davis, 1923). The Arkansas and Pension prospects are included in location 19 of Cobb (1972 [MF 366]). The Arkansas prospect is number 226 of Hawley and Associates (1978), 55 of Bundtzen (1981), and 69 of Thornsberry, McKee, and Salisbury (1984).
Geology: The country rocks at the Arkansas prospect are metafelsite and greenschist (meta-andesite) of the lower Paleozoic Spruce Creek sequence; they are cut by a plug or dike of Tertiary basalt (Bundtzen, 1981). The prospect is in a half-mile-long fault block terminated on the east by a northwest-striking cross fault exposed along the West Fork of Glen Creek (Thornsberry, McKee, and Salisbury, 1984, fig. K-2). The deposit consists of a 14-foot-thick shear zone containing quartz-sulfide veins. Individual veins are as much as 5 feet thick, and are separated by zones of sheared schist. The quartz contains galena, stibnite, and some sphalerite; a grab sample from a 5-foot-thick segment assayed 90 ounces of silver per ton (Davis, 1923). The principal vein is 1 to 4 feet thick, is vertical, and strikes N 70 E (Bundtzen, 1981). It contains arsenopyrite, extensively replaced by scorodite, and galena, boulangerite, jamesonite, and stibnite. A sample collected at the site in 1983 assayed a trace of gold, 2.33 ounces of silver per ton, 3.55 percent lead, 0.50 percent zinc, 1.9 percent antimony, and 5.65 percent arsenic (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 69).
Workings: The Arkansas vein was discovered in 1921(Davis, 1923). The prospect was mapped by Bundtzen (1981); an adit at the site was caved.
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Oxidation of arsenic mineral.

Commodities (Major) - Ag; (Minor) - As, Pb, Sb, Zn
Development Status: Undetermined.
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Other Databases

Link to USGS - Alaska:	MM083

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References