|Quadrangle map, 1:250,000-scale||CH|
|Quadrangle map, 1:63,360-scale||D-4|
|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 descriptionThe 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).|
|Workings or exploration||Claims staked in 1972 and 1973.|
|Indication of production||None|
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).
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-457, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Chandalar and Wiseman quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-340, 205 p.
DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000.
Grybeck, Donald, 1977, Known mineral deposits of the Brooks Range, Alaska: U.S. Geological Survey Open-File Report 77-166C, 45 p., 1 sheet, scale 1:1,000,000.
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|