|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 3,750 feet in a north-flowing tributary to the East Fork Maclaren River and about 3 miles southwest of the terminus of the Eureka Glacier. The occurrence is in the SW1/4SE1/4 section 16, T. 18 S., R. 7 E., Fairbanks Meridian.|
Geologic descriptionThe rock at this occurrence is metabasalt of the Nikolai Greenstone of Late Triassic age. This formation was mapped as the Amphitheater Basalt by Rose (1966 [ADMM GR 20]). At this locality a 30- by 50-foot area contains abundant copper-stained and pyrite-bearing basalt. Two samples from this site contain 578 and 697 parts per billion (ppb) gold, 31 and 69 parts per million silver, 31 and 108 ppb palladium, and 7.8 and 15.3 percent copper (W.T. Ellis, oral communication, 2001).
|Geologic map unit||(-146.409362480706, 63.2614721787802)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||Cretaceous or younger.|
|Alteration of deposit||Chlorite-epidote alteration of the volcanic host rock; local oxidation of copper minerals.|
|Workings or exploration||The occurrence is on active claims of MAN Resources. Two samples from this site contain contain 578 and 697 parts per billion (ppb) gold, 31 and 69 parts per million silver, 31 and 108 ppb palladium, and 7.8 and 15.3 percent copper (W.T. Ellis, oral communication, 2001).|
|Indication of production||None|
Additional commentsThis is a copper occurrence typical of the Nikolai Greenstone.
|Reporters||W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group) and W.J. Nokleberg (USGS)|
|Last report date||8/19/2002|