Unnamed Occurrence (ARDF - MC147; near Toby Creek), Nizina Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MC147; near Toby Creek)	- not defined -
Nizina Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

The locality is in the Wrangell-Saint Elias National Park and Preserve.
Location: This occurrence is low on the south valley wall of the Chitistone River. It is at an elevation of about 2,900 feet, 6,000 feet northeast of the mouth of Toby Creek and 6,500 feet northwest of elevation 6930. The site is in the NE1/4 of section 26, T. 4 S., R. 17 E. of the Copper River Meridian. This is locality 83 of MacKevett (1976); the location is accurate to within a few hundred feet.
Geology: This occurrence consists of chalcocite- and malachite-bearing veinlets and copper-stained amygdules in the lower part of Triassic Nikolai Greenstone (MacKevett and Smith, 1972; MacKevett, 1976). Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Workings: Only limited surface examination.
Age: Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Alteration: Oxidation.

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

Other Databases

Link to USGS - Alaska:	MC147

Other Regions, Features and Areas containing this locality

References