Unnamed Prospect (ARDF - MH113; west of Broxson Gulch), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - MH113; west of Broxson Gulch)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is at an elevation of about 4,600 feet in the headwaters of an east-flowing tributary to the stream(s) in Broxson Gulch, in the NW1/4NW1/4 section 34, T. 18 S., R. 8 E., Fairbanks Meridian. The locality corresponds to locality 5 on figure 3 of Rose (1966 [ADMM GR 20]) and to locality 42 in table 2 of Nokleberg and others (1991).
Geology: The rock at this prospect consists of dacite agglomerate of the Slana Spur Formation of Late Paleozoic age (Rose, 1966 [ADMM GR 20, figure 3]; Nokleberg and others, 1991). Nokleberg and others proposed that the rock is meta-andesite porphyry. The prospect is on a mineralized shear zone that strikes N85W and dips 35 degrees southwest; the shear zone can be traced for several hundred feet. Locally, the sheared andesite is altered to a chlorite-epidote rock that contains pyrite, chalcopyrite, and bornite. Some of the mineralized rock is coated with malachite. A foot-wide sample collected by Rose (1966 [ADMM GR 20]) assayed 2.95 percent copper and 2.2 ounces of silver per ton. Samples 79IL047A and B collected by the U.S. Geological Survey assayed as much as 3.8 percent copper, 50 parts per million (ppm) silver and 0.1 ppm gold (Nokleberg and others, 1991).
Workings: The prospect was staked by a Moneta-Porcupine Company prospector in 1964. Surface workings include a shallow trench and several small pits. A sample across a one-foot width assayed 2.95 percent copper and 2.2 ounces of silver per ton (Rose, 1966 [ADMM GR 20]). The prospect is on active MAN Resources claims.
Age: Late Paleozoic or younger; the mineralized shear zone cuts Upper Paleozoic rocks.
Alteration: Chlorite-epidote alteration of the volcanic host rock; local oxidation of copper minerals.

Commodities (Major) - Ag, Cu; (Minor) - Au
Development Status: None
Deposit Model: Low-sulfide copper vein.

Other Databases

Link to USGS - Alaska:	MH113

Other Regions, Features and Areas containing this locality

References