Unnamed Occurrence (ARDF - LH024; west of Snowcap Mountain), McGrath Mining District, Bethel Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - LH024; west of Snowcap Mountain)	- not defined -
McGrath Mining District	Mining District
Bethel Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is on a glacial moraine at the head of a small east tributary to the Stony River. It is at an elevation of about 4,600 feet, 2.6 miles west-northwest of Snowcap Mountain. The map site is in the NE1/4 of section 23, T 16 N., R 25 W, of the Seward Meridian. This is locality 7 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and Cobb and Reed (1981). The location is probably accurate to within a quarter of a mile.
Geology: Reed and Elliott (1970, p. 23) reported finding a 2-foot-diameter, float boulder of volcanic breccia containing 60 percent sulfide minerals at this locality. The boulder is in glacial float apparently derived from altered Tertiary volcanic rocks in the nearby cirque. A sample of the boulder contained 3,000 ppm silver and 1.5 percent copper, and greater than 2 percent lead, 1 percent antimony, and 1 percent zinc. Country rocks in this area are mostly Jurassic or Lower Cretaceous clastic sedimentary rocks and Upper Cretaceous or Tertiary volcanic rocks (Reed and Lanphere, 1973; Nokleberg and others, 1994).
Workings: Reconnaissance surface observation and sampling has been completed at this locality (Reed and Elliott, 1970).
Age: Late Cretaceous or Tertiary. The volcanic breccia is Upper Cretaceous or Tertiary.
Alteration: Sulfidation.

Commodities (Major) - Ag, Cu, Pb, Sb, Zn
Development Status: None
Deposit Model: Polymetallic veins? (Cox and Singer, 1986, model 22c)

Other Databases

Link to USGS - Alaska:	LH024

Other Regions, Features and Areas containing this locality

References