Occurrence, Inactive

Commodities and mineralogy

Main commodities Mo
Ore minerals molybdenite
Gangue minerals feldspar and quartz (aplite)

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale B-3
Latitude 56.39
Longitude -130.98
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence (Elliott and Koch, 1981, p. 8, loc. 12) is at an elevation of about 2400 feet on a ridge between Blue River and West Fork of Blue River. It is on or near the boundary of Sections 24 and 25, and about 0.4 mile south-southwest of the Alaska-British Columbia boundary. The location is accurate to within about a quarter of a mile.

Geologic setting

Geologic description

The country rocks in the general area of this occurrence comprise a stock of Eocene leucocratic quartz monzonite and granodiorite (Elliott and Koch, 1981; Koch, 1996).
The occurrence consists of a float sample collected by the U. S. Geological Survey in 1979 (Elliott and Koch, 1981, loc. 12). The sample consists of aplite rubble that contains up to about 0.5% visible molybdenite. All of the rubble at the locality is aplite, but not all of it contains visible molybdenite. The association of molybdenite, aplite, and leucocratic quartz monzonite suggests a porphyry-molybdenum deposit model.
Geologic map unit (-130.981708010493, 56.3896552543115)
Mineral deposit model Porphyry molybdenum (Cox and Singer, 1986; model 21b)?
Mineral deposit model number 21b?
Age of mineralization Eocene?

Production and reserves

Indication of production None

Additional comments

This occurrence is in Misty Fiords National Monument.


MRDS Number A010204
Reporters H. C. Berg (Fullerton, California)
Last report date 5/17/1998