Unnamed

Occurrence, Inactive

Commodities and mineralogy

Main commodities Mo
Ore minerals molybdenite
Gangue minerals diopside; garnet; quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-4
Latitude 56.12
Longitude -131.17
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is located at an elevation of about 3350 feet a few hundred feet upslope from a small (0.1 mile diameter) unnamed lake on a northwest-trending ridge drained by east-flowing tributaries to the lower Hulakon (Eulachon) River (Elliott and Koch, 1981, p. 8, loc. 11). 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 are Mesozoic or Paleozoic paragneiss and orthogneiss, and subordinate amphibolite and marble (Elliott and Koch, 1981; Koch, 1997).
The mineral occurrence consists of small, irregular pods of garnet-diopside skarn containing 1 percent disseminated molybdenite (Elliott and Koch, 1981, loc. 11). The skarn, which is accompanied by calc-silicate rock, forms pods and discontinuous disrupted layers (?) in amphibolite. The molybdenite occurs as minute discrete flakes in the skarn, and in and near glassy quartz veinlets (Koch, 1997, p. 31). Pelitic paragneiss about 1.5 miles north of this occurrence contains disseminated minute flakes of molybdenite, and geochemically anomalous Ag and Sn (Koch, 1997, p. 31). Koch (1997, p. 30-32) also reports anomalous values of Ag, Au, Cu, Mo, Sn, and Zn in a few geochemical samples collected by the U. S. Geological Survey in the late 1970s near this occurrence.
Geologic map unit (-131.171704634792, 56.1196351283025)
Mineral deposit model Skarn (Cox and Singer, 1986; model 18c or 18d).
Mineral deposit model number 18c or 18d
Alteration of deposit Formation of calc-silicate skarn in amphibolite country rock.

Production and reserves

Workings or exploration Pelitic paragneiss about 1.5 miles north of this occurrence contains disseminated minute flakes of molybdenite, and geochemically anomalous Ag and Sn (Koch, 1997, p. 31). Koch (1997, p. 30-32) also reports anomalous values of Ag, Au, Cu, Mo, Sn, and Zn in a few geochemical samples collected in the area near this occurrence by the U.S. Geological Survey in the late 1970s.
Indication of production None

Additional comments

This occurrence is in Misty Fiords National Monument.

References

MRDS Number A010286
Reporters H. C. Berg (Fullerton, California)
Last report date 5/17/1998