|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 4,000 feet on the west side of the north end of Landmark Gap Lake (Stout, 1976, plate 1). It is in the NW1/4NW1/4 section 31, T. 20 S., R. 9 E., Fairbanks Meridian.|
Geologic descriptionThis occurrence is in Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The unit was mapped as Boulder Creek volcanics by Stout (1976). The deposit consists of quartz-calcite-epidote veins that contain disseminated pyrite, chalcopyrite, and bornite and the oxidized copper minerals azurite and malachite. The veins occupy steep north- to northeast-trending joints that cut the limbs of the Amphitheater syncline (Stout, 1976). The veins range from less than an inch to about a foot thick.
|Geologic map unit||(-146.105347165411, 63.1444740609899)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||The quartz veins are localized in north-northeast-trending faults and joints that cut across the folded limbs of the Amphitheater syncline. They postdate the folding, which is of Jurassic age, and are probably either Cretaceous, related to regional metamorphism and granitic plutonism (Nokleberg and others, 1986; Kurtak and others, 1992), or early Tertiary (Stout, 1976).|
|Alteration of deposit||Oxidation of the copper minerals.|
|Indication of production||None|
Nokleberg, W.J., Aleinikoff, J.N., and Lange, I.M., 1986, Cretaceous deformation and metamorphism in the northeastern Mount Hayes quadrangle, eastern Alaska Range, in Bartsch-Winkler, Susan, and Reed, K. M., eds., Geologic studies in Alaska by the U.S. Geological Survey during 1985: U.S. Geological Survey Circular 978, p. 64-69
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||6/18/2001|