|Quadrangle map, 1:250,000-scale||NM|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This unnamed lode prospect is at an elevation of about 550 feet on the east flank of hill 1043, a few thousand feet north of central Osborn Creek (NM305). The map location is at the north edge of section 32, T. 10 S., R. 32 W., Kateel River Meridian. It is approximately located, probably to within one-half mile. It is locality 54 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).|
Geologic descriptionThis deposit consists of a quartz vein containing iron and copper sulfides, inferred to be pyrite and chalcopyrite. The vein is near a contact between schist and greenstone and is reported to have assayed from 0.2 to 2 ounces of gold per ton (Smith, 1908). Copper sulfide oxidation products, inferred to be malachite and azurite, are also present. Bedrock in this area is marble, schist, and local greenstone (Hummel, 1962 [MF 247]). The prospect is within about one-half mile of the head of mining activity on Osborn Creek (NM305).
|Geologic map unit||(-165.116709894096, 64.5848414546437)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).|
|Mineral deposit model number||36a|
|Age of mineralization||Mid-Cretaceous or younger; vein cross cuts schist metamorphosed in the mid-Cretaceous.|
|Alteration of deposit||Oxidation of chalcopyrite to secondary copper minerals.|
|Workings or exploration||Prospect pits are probably present.|
|Indication of production||None|
Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.
Hummel, C.L., 1962, Preliminary geologic map of the Nome C-1 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-247, 1 sheet, scale 1:63,360.
|Reporters||C.C. Hawley and Travis L. Hudson|
|Last report date||7/10/2000|