Unnamed Occurrence (ARDF - LH029; upper Chilligan River), Redoubt Mining District, Kenai Peninsula Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - LH029; upper Chilligan River)	- not defined -
Redoubt Mining District	Mining District
Kenai Peninsula Borough	Borough
Alaska	State
USA	Country

This occurrence is within Lake Clark National Park.
Location: This occurrence is on the north side of the upper Chilligan River within a small glacier-filled valley. It is at the toe of a south-flowing glacier, at an elevation of about 4,600 feet, and 1.5 miles north of Chilligan River. The map site is in the SE1/4 section 28, T 16 N, R 22 W, of the Seward Meridian. This is locality 15 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and location 30 of Gamble and others (1989). The location is probably accurate to within one-half mile.
Geology: Reed and Elliott (1970) reported that float in a medial moraine at this locality consists of silicified and sericitized quartz monzonite that contains 5 to 10 percent galena, sphalerite, and pyrite. The sulfide minerals are in clots as much as 2 cm in diameter and in thin veinlets up to 5 mm wide. Shear zones in nearby metasedimentary rocks contain galena and sphalerite. Sulfide-bearing samples contain up to greater than 20,000 ppm lead, greater than 10,000 ppm zinc, greater than 1,000 ppm tin, 2,000 ppm copper, and 150 ppm silver. The mineralization is near the contact between a Tertiary granitic pluton and Mesozoic metamorphic rocks.
Workings: Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).
Age: Tertiary. Mineralization occurs in Tertiary intrusive rocks and in shear zones in nearby metasedimentary rocks.
Alteration: Silicification? and sericite-pyrite replacement?

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

Other Databases

Link to USGS - Alaska:	LH029

Other Regions, Features and Areas containing this locality

References