Unnamed (near Liberty Falls)

Prospect, Inactive

Commodities and mineralogy

Main commodities Mn
Ore minerals manganite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale C-2
Latitude 61.6133
Longitude -144.5624
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located on the west side of Liberty Creek valley about 3,700 feet southwest of the Edgerton Highway. It is at an elvation of 1,700 feet in the northeast corner of section 17, T. 3 S., R. 5 E., of the Copper River Meridian. This prospect is approximately located, probably to within one-quarter mile. It is locality 56 of of Cobb and Matson (1972) and locality 47 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Chloritic schists of the Liberty Creek terrane (Winkler and others, 1981 [OFR 80-892-B]) contain discontinuous, lenses, veins, and veinlets that contain quartz and manganite (Jasper, 1967; Berg and Cobb, 1967). Individual lenses are 1 to 5 feet thick and as much as 40 feet long; veins are as much as 3 inches wide. Veins occur irregularly over a strike length of about a mile in the schist. Selected specimens assayed as much as 58.7 percent manganese (Berg and Cobb, 1967, p. 49).
Geologic map unit (-144.564500188903, 61.6128247500798)
Mineral deposit model Quartz-manganite veins
Age of mineralization Not known; the schist in the Liberty Creek terrane was probably metamorphosed during the mid-Cretaceous (Winkler, Silberman, and others, 1981).

Production and reserves

Workings or exploration The Liberty Creek prospect was explored with a few shallow trenches in 1959 (Berg and Cobb, 1967).
Indication of production None