Hanson and Bolshan Prospect (Elbow Passage), Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi

Regional Level Types
Hanson and Bolshan Prospect (Elbow Passage)	Prospect
Chichagof Mining District (Chicagof Mining District)	Mining District
Sitka	City Borough
Alaska	State
USA	Country

The prospect is in West Chichagof-Yakobi Wilderness.
Location: The Hanson and Bolshan prospect is at sea level on the east side of Elbow Passage, about 0.5 mile south of the entrance to Lake Anna. The prospect is at the midpoint of the south boundary of sec. 15, T. 49 S., R. 58 E. It is location P-68 of Bittenbender and others (1999), location 39 of Cobb (1972, 1978), and MAS nos. 0021140031 and 0021140311 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.
Geology: Johnson and Karl (1985) map the rocks in the area of this prospect as Cretaceous graywacke and argillite interbedded with sparse, lenticular beds of basalt. The rocks are cut by numerous high-angle, mainly northwest-striking faults. Reed and Coats (1941) report a 29-foot shaft and several pits at this prospect. The country rock is distinctly jointed, slaty graywacke that strikes about N57W and dips 70SW; the principal joint set strikes N40E and dips about 80NW. The shaft follows a fault that strikes N48W and dips 84SW. Quartz veinlets up to an inch thick fill joints in the hanging wall and are truncated by the fault. The bottom few feet of the shaft exposed up to a foot of pyrite-bearing ribbon quartz. The surface pits exposed other faults that may correlate with the one in the shaft. A few hundred feet from the shaft a 6- to 12-inch quartz vein in a N40E 70NW joint reportedly contained significant, but unspecified, gold values. Bittenbender and others (1999), citing Smith (1926), report that samples from dumps at this prospect contained up to 0.915 ounce of gold per ton. There is no record of production. Isotopic studies indicate that the gold-quartz veins in coastal southern and southeastern Alaska are Eocene, about 50 Ma in age (Haeussler, 1995; Goldfarb, 1997; Goldfarb and others, 1997). ARDF record SI087 provides an overview of the geology of auriferous quartz veins in the Chichagof Mining District.
Workings: Reed and Coats (1941) report a 29-foot shaft and several pits at this prospect.
Age: Isotopic studies indicate that the gold-quartz veins in coastal southern and southeastern Alaska are Eocene, about 50 Ma in age (Haeussler and others, 1995; Goldfarb, 1997; Goldfarb and others, 1997).
Production: There is no record of production.

Commodities (Major) - Au
Development Status: Undetermined.
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).

Other Databases

Link to USGS - Alaska:	SI114

Other Regions, Features and Areas containing this locality

References