Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; magnetite

Geographic location

Quadrangle map, 1:250,000-scale DE
Quadrangle map, 1:63,360-scale D-1
Latitude 54.8214
Longitude -132.303
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Ranger prospect is at an elevation of about 500 feet, 1.3 miles south to south-southeast from southeast tip of Tah Island. It is about 0.4 mile northwest of the center of section 29, T. 81 S., R. 88 E. The location is accurate.

Geologic setting

Geologic description

A major fault in the area juxtaposes sandstone of the Devonian Karheen Formation to the west against Ordovician diorite to the east (Gehrels, 1992). In 1918, Chapin described the Ranger prospect as an outcrop of magnetite up to 25 feet across that locally contains chalcopyrite. The country rock is greenstone (probably fine-grained granodiorite or volcanic rock), tuff, volcanic breccia, graywacke, and grit; the greenstone is cut by many granitic dikes and quartz veins.
The prospect was restaked in the early 1950s. Glover (1954 [MI 121-1]) describes the deposit as a body of magnetite about 10 by 15 feet in outcrop area. The original discovery, on which a short tunnel was driven early in the 20th century, was located about 100 feet north of the magnetite body staked in the 1950s. Glover also found several other lenses and pods of magnetite in greenstone, none of which was of substantial size. He found no chalcopyrite in any of the magnetite bodies. The greenstone porphyry in the vicinity is mildly radioactive, averaging about 0.005 percent eU.
Geologic map unit (-132.304655598605, 54.8210585749276)
Mineral deposit model Chalcopyrite? in magnetite body.

Production and reserves

Workings or exploration The prospect was explored by a 10-foot adit and some surface clearing prior to 1918. A magnetite body nearby was restaked in the 1950s.
Indication of production None

Additional comments

This prospect is in the South Prince of Wales Wilderness, which is closed to prospecting and mineral exploration.