Unnamed Occurrence (ARDF - LH018; near Styx River), McGrath Mining District, Bethel Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - LH018; near Styx River)	- not defined -
McGrath Mining District	Mining District
Bethel Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is on a ridge along the east side of an unnamed east tributary to the Styx River. It is at an elevation of about 5,300 feet, 0.8 mile west of peak 6665. The map site is in the SW1/4 section 11, T 18 N, R 21 W, of the Seward Meridian. This is locality 13 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and localities 16 and 17 of Gamble and others (1989). The location is probably accurate to within a quarter of a mile.
Geology: Reed and Elliott (1970) reported that float of mineralized granitic rock contains disseminated pyrite and minor chalcopyrite and that float of altered felsic rock contains pyrrhotite, sphalerite, galena, and pyrite. The float also contains quartz veins. Samples of altered felsic rock contain as much as 150 ppm silver, 2 percent copper, greater than 2 percent lead and 1 percent zinc, and 0.4 ppm gold. Other float samples from the general area contain as much as 1,000 ppm silver and 0.5 ppm gold. The granitic rocks are Tertiary plutons of the Alaska-Aleutian Range batholith (Cobb and Reed, 1981).
Workings: Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).
Age: Tertiary. Quartz veins and mineralization crosscut float boulders of Tertiary intrusive rocks.
Alteration: Quartz veining and possibly quartz-pyrite-sericite replacement.

Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: No
Deposit Model: Polymetallic veins and porphyry Cu? (Cox and Singer, 1986, model 22c and 17)

Other Databases

Link to USGS - Alaska:	LH018

Other Regions, Features and Areas containing this locality

References