Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities Au
Ore minerals argentiferous galena; azurite; copper sulfides; malachite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale D-4
Latitude 67.86
Longitude -148.72
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is at an elevation of about 3,500 feet, approximately 3 miles west-northwest of the west end of Reds Lake (sec. 17, T. 35 N., R. 5 W., of the Fairbanks Meridian). The location is accurate within a 1/2-mile radius.

Geologic setting

Geologic description

The Gayle prospect is one of at least two Pb-Zn-Ag plus or minus Cu prospects near this site. Descriptive information specific to the property is sparse. Brosgé and Reiser (1964) described the prospect as chalcopyrite( ?) and/or malachite-azurite stains near the top of the Skajit Limestone, while Grybeck (1977) reported that sphalerite and galena (with silver values) on the Gayle and Bob prospects occur in small veinlets and stockworks in altered limestone and marble. Newberry and others (1997) classify the Gayle prospect as a calcic Zn-Pb skarn and replacement body. These Zn-Pb skarns are described by Newberry and others (1986) as distal to Devonian(?) porphyry Cu-Mo systems associated with the Horace Mountain plutons in the Chandalar copper belt. The bedrock near the prospect is mapped as Devonian Hunt Fork Shale near its contact with Skajit Limestone. Intercalated diorite sills and andesitic flows(?) are also present in the section.
Geologic map unit (-148.722768288178, 67.8596132951811)
Mineral deposit model Zn-Pb skarn deposits? (Cox and Singer, 1986; model 18c?).
Mineral deposit model number 18c?
Age of mineralization Devonian(?), based on reported Early Devonian Pb/Pb zircon ages from the associated Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996).

Production and reserves

Workings or exploration Claims staked in 1972 and 1973.
Indication of production None

Additional comments

See also: Bob (CH089) and Bibban (CH090).
Brosgé and Reiser (1972, p. 7, 11), reported analytical results of 1 to 3 ppm Ag, 700 ppm Pb, and 6.5 ppm Au from a rock sample probably collected from the Gayle prospect.
Alaska Kardex Nos. 031-61C and 58B (Kardex is a card file mining claim information system located at the State of Alaska DNR Public Information Center in Fairbanks).


MRDS Number A012139


Maas, K.M., 1987, Maps summarizing land availability for mineral exploration and development in northern Alaska, 1986: U.S. Bureau of Mines Open-File Report 10-87, 33 quadrangle overlays.
Newberry, R.J., Allegro, G.L., Cutler, S.E., Hagen-Levelle, D.D., Adams, D.D., Nicholson, L.C., Weglarz, T.B., Bakke, A.A., Clautice, K.H., Coulter, G.A., Ford, M.J., Myers, G.L., and Szumigala, D.J., 1997, Skarn deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 355-395.
Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
Reporters J.M. Britton (Anchorage)
Last report date 11/17/1999