Unnamed Occurrence (ARDF - MH038; tributary to Pass Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH038; tributary to Pass Creek)	- not defined -
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: This occurrence is at about 4,100 feet elevation in a north-flowing tributary of Pass Creek, about a mile southwest of its junction with Clearwater Creek and in the SW1/4SW1/4 section 28, T. 20 S., R. 4 E., Fairbanks Meridian. The occurrence corresponds to locality A40 of Kurtak and others (1992), location 1 in figure 4 of Cobb (1979 [OFR 79-238]) and locality 1 in table 2 of Nokleberg and others (1991).
Geology: The rocks at this occurrence are propylitized metabasalt of the Nikolai Greenstone of Late Triassic age. The metabasalt is sheared and locally silicified (Nokleberg and others, 1991; Kurtak and others, 1992). The deposit consists of copper minerals in bedrock and in float. Malachite, chalcocite, and possibly native copper occur in quartz or quartz-epidote veins and vesicles (Kurtak and others, 1992; Smith and others, 1973). U.S. Bureau of Mines sample 1416 assayed 0.16 percent copper and near background concentrations of gold (10 parts per billion) and silver (0.5 part per million) (Kurtak and others, 1992, table A41).
Workings: The site has low development potential for copper deposits (Kurtak and others, 1992); there are no workings of significance.
Age: The deposit is probably either Cretaceous or early Tertiary (see MH060 and MH100).
Alteration: Metabasalt is propylitized and locally silicified.

Commodities (Major) - Cu
Development Status: None
Deposit Model: Basaltic Cu (Cox and Singer, 1986, model 23).

Other Databases

Link to USGS - Alaska:	MH038

Other Regions, Features and Areas containing this locality

References