Unnamed (tributary of the east fork in Broxson Gulch)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Mo
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-5
Latitude 63.3223
Longitude -146.0569
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,700 feet in the headwaters of an unnamed east tributary to the east fork the stream(s) in Broxson Gulch. The occurrence is about a quarter-mile northeast of peak 4825 in section 29, T. 18 S., R. 9 E., Fairbanks Meridian. This occurrence corresponds to locality 54 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

The rocks in the area of this occurrence are andesitic tuffs and breccias of the Slana Spur Formation of Late Paleozoic age (Nokleberg and others, 1991). The occurrence is about one-quarter mile north of the Airstrip Fault that bounds the Slana Spur unit on the south (Rose, 1965, figure 2). The mineral deposit consists of sheared and silicified metavolcanic graywacke; grab sample 79IL027E assayed 2.3 parts per million (ppm) gold, 150 ppm silver, and 30 ppm molybdenum (Nokleberg and others, 1991, locality 54, table 2).
Geologic map unit (-146.059163282221, 63.3218805644805)
Mineral deposit model Low sulfide Au-quartz vein? (Cox and Singer, 1986; model 36a?).
Mineral deposit model number 36a?
Age of mineralization Possibly mid-Cretaceous, related to faulting and regional metamorphism (Nokleberg and others, 1982).
Alteration of deposit Silicification of the host rock.

Production and reserves

Workings or exploration The occurrence is on active MAN Resources claims.
Indication of production None