Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Sb
Other commodities Ag; As
Ore minerals arsenopyrite; stibnite
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-1
Latitude 62.9356
Longitude -156.49782
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Katz prospect is on a ridge about 1.2 miles east of Ganes Creek. It is at an elevation of about 1,400 feet near the center of section 21, T. 33 N., R. 38 W., of the Seward Meridian. The prospect (spelled Kaatz) was approximately located and described as locality 13 of Cobb (1972 [MF 363]); also described in Cobb (1976 [OFR 76-576]).

Geologic setting

Geologic description

The Katz (or Kaatz) deposit is a stibnite-quartz-gold vein 4 to 12 inches thick along the footwall of a granite porphyry dike that contains disseminated stibnite and arsenopyrite. The vein strikes N30E and dips 75SE; it is subparallel to the dike. According to Mertie and Harrington (1924), the vein and the associated dike can be traced for about a mile. The Katz lode occurs directly over the projection of the Ganes-Yankee fault and dike swarm (Bundtzen and Laird, 1982; Bundtzen and Miller, 1997). According to Miller, Bundtzen and Gray (2004), grab samples contain up to 1,100 parts per billion (ppb) gold, 2,000 ppb silver, and 35.00 percent antimony. The Katz deposit is similar to the Independence Mine (ID031) and the Goss Gulch deposit (ID039) which also occur along Ganes-Yankee fault and dike swarm (Bundtzen and Miller, 1997).
Geologic map unit (-156.500185248559, 62.9349667770604)
Mineral deposit model Gold-antimony deposit (Berger, 1993) or simple antimony vein (Cox and Singer, 1986; model 27d).
Mineral deposit model number 27d
Age of mineralization Undated; probably Late Cretaceous, based on nearby dated intrusions along the Ganes-Yankee Creek fault (Bundtzen and Miller, 1997).
Alteration of deposit Dike has undergone carbonatization and sericitization.

Production and reserves

Workings or exploration The Katz prospect was explored by old trenches and an adit, now caved, probably before 1920.
Indication of production Undetermined



Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/13/2003