Unnamed Occurrences (ARDF - MH224; Rainbow Mountain), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrences (ARDF - MH224; Rainbow Mountain)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of 6,550 feet, about 0.2 mile southeast of the top of Rainbow Mountain. It is in the SW1/4SW1/4 section 34, T. 18 S., R. 11 E., Fairbanks Meridian. This record combines two occurrences, one discovered by American Copper and Nickel Company (W.T. Ellis, oral communication, 1996) and a nearby occurrence that corresponds to locality S109 in table of Nokelberg and others (1991).
Geology: The rocks at the top of Rainbow Mountain are Slana Spur Formation of Pennsylvanian age and fragmental andesite and dacite volcanic rocks that are intruded by Permian metadacite porphyry (Nokleberg and others, 1991). A quartz-calcite-chalcocite-veined copper-stained zone at this locality was sampled by American Copper and Nickel Company (W.T. Ellis, oral communication, 1998). Their samples contained 8.7 percent copper, 33 parts per million (ppm) silver, and 76 parts per billion gold. The U.S. Geological Survey collected a composite chip sample of nearby iron-stained, pyritic metadacite porphyry that contained 700 ppm zinc and 300 ppm lead (Nokleberg and others, 1991).
Workings: American Copper and Nickel Company (W.T. Ellis, oral communication, 1998) samples contained 8.7 percent copper, 33 parts per million (ppm) silver, and 76 parts per billion gold. The U.S. Geological Survey collected a composite chip sample of nearby iron-stained, pyritic metadacite porphyry that contained 700 ppm zinc and 300 ppm lead (Nokleberg and others, 1991). The occurrences are on active claims of MAN Resources.
Age: Probably Permian.

Commodities (Major) - Ag, Cu; (Minor) - Au, Pb, Zn
Development Status: No
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c).

Other Databases

Link to USGS - Alaska:	MH224

Other Regions, Features and Areas containing this locality

References