Little Clearwater lode Occurrence, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Little Clearwater lode Occurrence	Occurrence
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

The mineralized zones are small and mostly in rubble.
Location: The Little Clearwater lode is at an elevation of about 4,850 feet about 0.7 mile southwest of peak 5315 at the south end of the Clearwater Mountains; it is in the SE1/4SE1/4 section 24, T. 20.S., R. 4 E., Fairbanks Meridian. The occurrence corresponds to locality A36 of Kurtak and others (1992), locality 3 in figure 4 of Cobb (1979 [OFR 79-238]), and locality 6 in table 2 of Nokleberg and others (1991).
Geology: The rock at the occurrence is propylitized basalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The deposit consists of copper-bearing quartz-calcite veins in the weakly altered basalt. Reported copper minerals are chalcopyrite, chalcocite, and malachite. Sample 1414 from metabasalt assayed 0.34 ounce of silver per ton and 1.08 percent copper; gold is present in a near-background amount (10 parts per billion) (Kurtak and others, 1992, table A32, p. 165).
Workings: U.S. Bureau of Mines sample 1414 contained 1.08 percent copper and 0.34 ounce of silver per ton (Kurtak and others, 1992, table A32).
Age: The deposit is probably either Cretaceous or early Tertiary in age (see MH060, MH087, or MH100).
Alteration: Propylitic alteration.

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

Other Databases

Link to USGS - Alaska:	MH046

Other Regions, Features and Areas containing this locality

References