Hill and Berkland

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-7
Latitude 57.6548
Longitude -136.0889
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Hill and Berkland prospect is at sea level on the east side of upper Klag Bay. The prospect is 0.4 mile north-northwest of the center of sec. 3, T. 49 S., R. 58 E. It is location P-80 of Bittenbender and others (1999), location 35 of Cobb (1972, 1978), and MAS no. 0021140045 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.

Geologic setting

Geologic description

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. These include the extension of the faults at the Chichagof Mine (SI093), which controls the mineralization there and whose trace is about 0.5 mile northeast of this prospect.
Reed and Coats (1941) describe a 50-foot tunnel along a fault in argillaceous graywacke that strikes N58W and dips 62SW. In the tunnel, the fault strikes N45W and dips 63NE; it intersects another fault that strikes N20W and dips 65NE. Each of the faults contains quartz up to 6 inches thick. A joint near the portal of the tunnel also carries a little quartz. There is no record of production from this prospect.
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.
Geologic map unit (-136.090723710791, 57.6544291417232)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization 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 and reserves

Workings or exploration The prospect was explored before WW II by a 50-foot tunnel.
Indication of production Undetermined
Production notes There is no record of production from this prospect.

Additional comments

The prospect is in West Chichagof-Yakobi Wilderness.

References

MRDS Number A013279

References

Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Goldfarb, R J., 1997, Metallogenic evolution of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 4-34.
Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190.
Haeussler, P J., Bradley, D., Goldfarb, R., Snee, L., and Taylor, C., 1995, Link between ridge subduction and gold mineralization in southern Alaska: Geology, v. 23, no. 11, p. 995-998.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
Reporters H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004