Reynolds; Butte Creek Copper Group Prospect, Chisana Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Reynolds; Butte Creek Copper Group Prospect	Prospect
Chisana Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

The prospect is in the Wrangell-St. Elias National Preserve.
Location: This prospect is 2,000 feet west of upper Reynolds Creek, a south tributary to the East Fork, Snag Creek. It is at an elevation of about 5,300 feet, 5,000 feet northeast of peak 6827. The site is 0.2 mile east of the center of section 25, T. 5 N., R. 21 E. of the Copper River Meridian. This is locality 2 of Richter and others (1973) and locality 48 of Richter and others (1975). Cobb and Richter (1980) included this prospect under the name 'Reynolds'. It is located to within a few hundred feet.
Geology: Small veins of bornite, chalcocite, specularite, malachite, and calcite cut amygdaloidal basalt of the Triassic, Nikolai Greenstone (Moffit, 1943). The deposits were explored by several open cuts. A chip sample across 5 feet of iron-stained greenstone contained 50 parts per million (ppm) boron, 150 ppm copper, 70 ppm nickel, and 200 ppm vanadium (Matson and Richter, 1971 [OFR 71-202]). Copper mineralization is locally 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: The deposits were explored by several open cuts.
Age: Cretaceous? Copper mineralization is locally 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: Low-grade metamorphic assemblages including quartz, calcite, epidote, zeolites, and some native copper replace basalt or fill amygdules (Richter and others, 1973).

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

Other Databases

Link to USGS - Alaska:	NB095

Other Regions, Features and Areas containing this locality

References