Unnamed (Tozitna River, eastern Ray Mountains)

Occurrences, Inactive

Commodities and mineralogy

Main commodities Au; Pd; Pt

Geographic location

Quadrangle map, 1:250,000-scale TN
Quadrangle map, 1:63,360-scale C-2
Latitude 65.64385
Longitude -150.6698
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents occurrences of geochemically anomalous rock samples in the eastern Ray Mountains, on ridges southeast of the Tozitna River. The site is at an elevation of about 3,100 feet, in the southwest quarter of section 34, T. 10 N., R. 15 W., of the Fairbanks Meridian. The location is accurate within 0.5 mile. This site roughly corresponds with the site for Ray Mountains, U.S. Bureau of Land Management MAS number 0020480132.

Geologic setting

Geologic description

Chapman and others (1982) map the Tozitna River area as Rampart Group, Mississippian to Jurassic sedimentary and mafic volcanic rocks, along with abundant gabbro and sparse ultramafic rocks. Contacts between the mafic and ultramafic rocks are well defined, suggesting a zoned ultramafic complex (Barker, 1990).
A small body of mafic and ultramafic rocks, including locally serpentinized peridotite, gabbro, and pyroxenite, occurs at this site (Barker, 1990; Foley, 1992). Samples of this body contained as much as 25 parts per billion (ppb) gold, 45 ppb palladium, and 40 ppb platinum (Foley, 1992).
Geologic map unit (-150.672358564685, 65.6433701166003)
Mineral deposit model Noril'sk Cu-Ni-PGE? (Cox and Singer, 1986; model 5b?), Podiform chromite? (Cox and Singer, 1986; model 8a?).
Mineral deposit model number 5b?, 8a?

Production and reserves

Workings or exploration The mafic and ultramafic rocks in this area were sampled in 1979 during a joint U.S. Bureau of Mines - U.S. Bureau of Land Management mineral resource evaluation. Samples of a small mafic-ultramafic body at this site contained as much as 25 parts per billion (ppb) gold, 45 ppb palladium, and 40 ppb platinum (Foley, 1992).
Indication of production None