|Quadrangle map, 1:250,000-scale||BN|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the divide between Dillon Creek, a west headwater tributary of Pargon River, and an unnamed east headwater tributary of Niukluk River. It is about 1,000 feet south of the saddle between these two drainages at an elevation is 2.035 feet. It is locality 81 of Gamble (1988).|
Geologic descriptionChalcopyrite, galena, pyrite (?), and duftite (?) are intergrown with drusy comb-quartz in fissure veins along a 30 foot-wide fault zone in high grade metamorphic rocks here (Briskey, 1983). The vein is oxidized and secondary minerals include limonite, malachite, and chrysocolla. A grab sample contained 0.5 ppm Au, 8 % As, 6,000 ppm Zn, 680 ppm Sb, 300 ppm Ag, 1.5 % Cu, greater than 2 % Pb, and 30 ppm Mo (Gamble, 1988). This occurrence, and several others in this part of the Bendeleben A-4 quadrangle, are in high grade metamorphic rocks that are structurally above or peripheral to the crosscutting Pargon pluton. The Pargon pluton is mostly granodiorite and assumed to be Cretaceous in age (Till and others, 1986). It was emplaced at shallower depths than the more deep-seated Bendeleben pluton to the east. The metamorphic rocks peripheral to the western Pargon pluton are also intruded by small, felsic dikes and plugs including quartz porphyry and muscovite granite.
|Geologic map unit||(-163.819643131864, 65.2072764890603)|
|Mineral deposit model||Polymetallic vein in high grade metamorphic rocks (Cox and Singer, 1986; model 22c?).|
|Mineral deposit model number||22c?|
|Age of mineralization||Cretaceous; this occurrence is probably related to emplacement of the Pargon pluton which is assumed to be Cretaceous in age.|
|Alteration of deposit||Oxidation of vein sulfides has occurred.|
|Workings or exploration||A shallow, 16 foot-long prospect trench trending N 55 W has been dug here.|
|Indication of production||None|
Briskey, J.A., 1983, Summary of field observations on Seward Peninsula mineral deposits: U.S. Geological Survey, unpublished administrative report, 34 p.
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.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||3/15/1999|