|Quadrangle map, 1:250,000-scale||MC|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is in the headwaters of an unnamed tributary to Discovery Creek, a south tributary to the Chitina River. It is at an elevation of about 4,600 feet, 5,500 feet northeast of peak 6455 and 7,500 feet west-southwest of elevation 5816. The site is about 2,800 feet east-southeast of the center of section 5, T. 10 S., R. 18 E. of the Copper River Meridian. This is locality 6 of MacKevett (1976); it is accurate to within about 1,000 feet.|
Geologic descriptionThis occurrence consists of sulfide-bearing quartz veins up to 30 centimeters wide that cut Jurassic quartz monzonite of the Chitina Valley batholith (MacKevett, 1976, 1978). A sample of vein material contained 10 parts per million (ppm) silver, 0.2 ppm gold, 20,000 ppm copper, and 150 ppm molybdenum (MacKevett, 1976). K/Ar dates for the Chitina Valley batholith range from 138 to 146 +/- 4 Ma (MacKevett, 1978).
|Geologic map unit||(-142.244105757703, 61.0276677538469)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Late Jurassic(?) based on K/Ar dates for the host Chitina Valley batholith which range from 138 to 146 +/- 4 Ma (MacKevett, 1978).|
|Alteration of deposit||Silicification.|
|Workings or exploration||Limited surface sampling.|
|Indication of production||None|
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
|Reporters||Travis L. Hudson (Applied Geology, Inc.)|
|Last report date||1/12/2003|