|Quadrangle map, 1:250,000-scale||BN|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the west side of the Windy Creek stock. It is on the ridge crest at an elevation 1,725 feet between the headwater forks of the major north tributary to Mosquito Creek. Mosquito Creek drains westward from headwaters in the northern Darby Mountains to the Fish River in McCarthy's Marsh. This is approximately located; it is sample locality 8 of Miller and others (1971). This location covers localities 47 and 48 of Gamble (1988).|
Geologic descriptionThis prospect is in the west part of the Windy Creek stock, a mid-Cretaceous composite pluton of quartz monzonite, monzonite, syenite and some melanite-bearing nepheline syenite (Miller and others, 1971; 1972). Latite and greenish quartz porphyry, both commonly pyritiferous, and biotite granodiorite dikes locally crosscut the alkalic-related phases of the Windy Creek stock (Miller and others, 1971; 1972; Till and others, 1986). Roof pendants of metamorphic rocks are present. Miller and others (1971) collected five samples over a distance of about 2 miles. A sample of an oxidized quartz vein, their sample locality 8, contained 1,500 ppm Mo, 3,000 ppm Pb, 1,500 ppm Zn, 500 ppm Sn, 3 ppm Ag, and greater than 1,000 ppm La. The other four samples collected by Miller and others (1971) included quartz veins, quartz-veined monzonite, and oxidized aphanitic intrusive rock. Except for the aphanitic intrusive rock, these samples contained anomalous metal contents including up to 7 ppm Ag, greater than 5,000 ppm Ba, 15,000 ppm Pb, 700 ppm Mo, and 150 ppm Sn. In general, the west side of the Windy Creek stock is fractured and both quartz-sulfide and quartz-fluorite-sulfide veins are present (Till and others, 1986). Rare quartz veins up to 5 inches wide contain up to several percent fluorite, 1 to 2 percent molybdenite, galena, and sphalerite. Thin quartz veinlets containing pyrite, fluorite, molybdenite, scheelite, and minor galena and sphalerite are more common although stockwork vein systems have not been observed (Till and others, 1986). Alteration in the intrusive rocks includes limonite staining, weak to strong sericitization of plagioclase, and variable chloritization and sericitization of hornblende (Till and others, 1986). This area was staked in the 1970s as a potential porphyry molybdenum prospect.
|Geologic map unit||(-162.592624270063, 65.1392963608195)|
|Mineral deposit model||Porphyry Mo, low-F? (Cox and Singer, 1986; model 21b?) However, the prospect is associated with an alkalic intrusive rock complex and highly polymetallic in character.|
|Mineral deposit model number||21b ?|
|Age of mineralization||Mid-Cretaceous; the Windy Creek stock is inferred to be mid-Cretaceous based on similarities to the Granite Mountain stock to the east in the Candle quadrangle (Miller and others, 1971).|
|Alteration of deposit||Alteration in the intrusive rocks includes limonite staining, weak to strong sericitization of plagioclase, and variable chloritization and sericitization of hornblende (Till and others, 1986).|
|Workings or exploration||No workings are known but mining claims were staked in the area in the 1970s.|
|Indication of production||None|
Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.
Miller, T.P., Elliott, R.L., Grybeck, D.J., and Hudson, T.L., 1971, Results of geochemical sampling in the northern Darby Mountains, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-211, 12 p.
Miller, T.P., Grybeck, D.J., Elliott, R.L., and Hudson, T.L., 1972, Preliminary geologic map of the southeastern Bendeleben and eastern Solomon quadrangles, eastern Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-256, 11 p., 1 sheet, scale 1:250,000.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||3/15/1999|