|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 Coffee Creek, a south tributary to the Chitina River. It is on the west side of a cirque valley at an elevation of about 5,200 feet, 6,000 feet southwest of elevation 5816. The occurrence is about 2,100 feet north of the center of section 9, T. 10 S., R. 18 E. of the Copper River Meridian. This is locality 5 of MacKevett (1976); the location is accurate to within about 1,000 feet.|
Geologic descriptionThis occurrence consists of sulfide minerals in quartz veins to 15 centimeters wide and disseminated sulfides in Jurassic quartz diorite of the Chitina Valley batholith (MacKevett, 1976, 1978). A sample of selected quartz vein material contained 30 parts per million (ppm) silver, 2 ppm gold, 20,000 ppm copper, and 70 ppm molybdenum. K/Ar dates for the host Chitina Valley batholith range from 138 to 146 +/- 4 Ma (MacKevett, 1978).
|Geologic map unit||(-142.229104800878, 61.0206678157986)|
|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|