McKallick

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 57.6856
Longitude -136.0785
Nearby scientific data Find additional scientific data near this location
Location and accuracy The McKallick Lode prospect is at an elevation of about 600 feet on the northwest valley wall at the head of Chichagof Creek. The prospect is 0.5 mile east of the southwest corner of sec. 19, T. 48 S., R. 58 E. It is location P-59 of Bittenbender and others (1999), location 29 of Cobb (1972, 1978), and MAS no. 0021140063 (U.S. Bureau of Land Management, 2002). The location is accurate.

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; they include the fault at the Hirst Mine (SI087), which controls the mineralization there and whose trace is about a mile southwest of the prospect.
Reed and Coats (1941) report two tunnels on this prospect, one is 35 feet long and another about 55 feet long. The 35-foot tunnel explores a 5-foot-thick, auriferous quartz vein in slaty graywacke, and closely follows two faults that strike N15W and dip 55 SW. The vein continues for only about 10 feet in the tunnel. They report no mineralization in the other tunnel. Bittenbender and others (1999), citing Still and Weir (1981), report that sample of a 2.3-foot-thick quartz lens assayed up to 0.24 ounce of gold per ton. There is no record of any 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.
Geologic map unit (-136.080325890483, 57.6852285793047)
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 by two tunnels, one is 35 feet long and another about 55 feet long.
Indication of production Undetermined
Production notes There is no record of any production.

Additional comments

The prospect is in West Chichagof-Yakobi Wilderness.

References

MRDS Number A013268

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