Lakina Prospect, Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Lakina Prospect	Prospect
Chistochina 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 prospect is on the west valley wall of upper Lakina River. It is at an elevation of about 4,600 feet, 4,500 feet east-southeast of elevation 5710, and 8,800 feet north-northwest of the confluence of Mill Creek and Lakina River. The site is just inside the center of the south boundary of section 34, T. 3 S., R. 11 E. of the Copper River Meridian. This is locality 101 of MacKevett (1976); the location is accurate to within about 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'Lakina R.'.
Geology: This prospect consists of two shear zones, each less than 1 meter thick, that contain chalcocite, bornite, covellite, malachite, and azurite (Moffit and Maddren, 1909; MacKevett, 1976). The shear zones cut Triassic Nikolai Greenstone and a nearby brecciated flow top in the Nikolai contains native copper. The deposits were explored by numerous surface workings and an adit. Some exploration was done as recently as the 1950s (MacKevett, 1976).
Workings: The deposits were explored by numerous surface workings and an adit. Some exploration was done as recently as the 1950s (MacKevett, 1976).
Age: Cretaceous? The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).
Alteration: Oxidation.

Commodities (Major) - Cu
Development Status: Undetermined.
Deposit Model: Basaltic Cu (Cox and Singer, 1986; model 23)

Other Databases

Link to USGS - Alaska:	MC071

Other Regions, Features and Areas containing this locality

References