Unnamed Occurrence (ARDF - HE189; near Raft Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - HE189; near Raft Creek)	- not defined -
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 3,900 feet, on of the first northwest tributary to Raft Creek. The map site is about 1.2 mile north of the Denali Highway, near the center of sec. 25, T. 21 S., R. 2 E., of the Fairbanks Meridian. This location is shown in Smith (1981).
Geology: The country rocks in the area of the occurrence are mostly the Nikolai Greenstone, a thick sequence of Middle or upper Triassic basalt and subordinate tuff, argillite, and chert (Nokleberg and others, 1992). At the occurence, a small diorite pluton intrudes the Nikolai Greenstone. The deposit consists of chalcopyrite, pyrite, and malachite erratically distributed in quartz veins 1/4 to 3 inches wide. The veins occur along a shear zone several feet wide that cuts the diorite pluton.
Age: Middle Triassic or younger.
Alteration: Local oxidation and copper minerals.

Commodities (Major) - Cu
Development Status: None
Deposit Model: Quartz vein in shear zone.

Other Databases

Link to USGS - Alaska:	HE189

Other Regions, Features and Areas containing this locality

References