Regal

Mine, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-6
Latitude 61.5565
Longitude -142.9716
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Regal mine is on the south end of the ridge between Kennicott and Root glaciers (MacKevett, 1972). It is at an elevation of about 5,450 feet, 1,000 feet south of Donoho Peak (elevation 6696) and 5,000 feet east of Kennicott Glacier. The site is 1,500 feet north of the center of section 1, T. 4 S., R. 13 E. of the Copper River Meridian. This is locality 97 of MacKevett (1976). The mine location is shown on the McCarthy C-6 quadrangle (1993 edition).

Geologic setting

Geologic description

The Regal mine is at the contact of Triassic Nikolai Greenstone and overlying Triassic Chitistone Limestone. One to three feet of shale separates the greenstone from the limestone. The deposits are mostly disseminated powdery malachite in the shale and in the upper 3 to 5 feet of greenstone (Miller, 1946). Some malachite coats fractures in the limestone and a small amount of chalcocite and bornite in limestone was found at one of the portals to the underground workings. The mine was developed by 2 inclines, 3 short adits, and 400 to 500 feet of drifts (Miller, 1946). Only small amounts of ore were produced. 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).
Geologic map unit (-142.973684364436, 61.5560634494514)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Age of mineralization 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 of deposit Oxidation.

Production and reserves

Workings or exploration The mine was developed by 2 inclines, 3 short adits, and 400 to 500 feet of drifts (Miller, 1946). Only small amounts of ore were produced.
Indication of production Yes; small
Production notes Only small amounts of ore were produced.

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References