Unnamed (west of central Osborn Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals azurite; chalcopyrite; gold; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-1
Latitude 64.5856
Longitude -165.1141
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 setting

Geologic description

This 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.

Production and reserves

Workings or exploration Prospect pits are probably present.
Indication of production None