Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold; ilmenite; magnetite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-7
Latitude 57.6391
Longitude -136.1457
Nearby scientific data Find additional scientific data near this location
Location and accuracy The McKallick placer prospect is at sea level on the east side of Odgen Passage, about 0.5 mile southeast of an islet named Frog Peak. The prospect, which is on patented ground, is 0.4 mile northwest of the center of sec. 8, T. 49 S., R. 58 E. It is location P-66 of Bittenbender and others (1999), location 72 of Cobb (1972, 1978), and MAS no. 0021140064 (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.
Reed and Coats (1941) report that about 8 feet of angular graywacke gravel at this placer prospect has been explored for length of about 50 feet and a width of about 20 feet, to a depth of up to 8 feet. The bedrock is graywacke. The auriferous gravel apparently is younger than the morainal material at the prospect, and possibly younger than the Holocene ash from Mt. Edgecumbe. Reed and Coats collected panned concentrates that contained gold, mostly enclosed in or attached to quartz, with pyrite, ilmenite, and magnetite. They concluded that the placer is eluvial from a nearby lode source concealed by vegetation. Bittenbender and others (1999), citing Still and Weir (1981), report that a pan concentrate of the gravel assayed 0.11 ounce of gold per ton. There is no record of any production, but a little gold was probably recovered.
Geologic map unit (-136.147523885837, 57.6387274563731)
Mineral deposit model Eluvial placer gold (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Holocene?

Production and reserves

Workings or exploration Surface sampling and trenching.
Indication of production Undetermined
Production notes There is no record of any production, but a little gold may have been produced.

Additional comments

The prospect is in West Chichagof-Yakobi Wilderness.


MRDS Number A013285


Reporters H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004