Unnamed

Prospect, Inactive

Commodities and mineralogy

Main commodities Mo
Other commodities Cu; Zn
Ore minerals chalcopyrite; molybdenite; pyrite; sphalerite
Gangue minerals fluorite; quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-5
Latitude 62.8597
Longitude -149.3179
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect which has been located as the Caribou 1-59 claims is at an elevation of about 2,250 feet, at the west end of a plateau bounded by Portage Creek, Devils Canyon, and Devil Creek It is 2.8 miles north-northeast of the junction of Portage Creek and the Susitna River in the SW1/4 sec. 17, T. 32 N., R. 1 E., Seward Meridian. The location is accurate to within 1/4 mile. It is locality 8 of Csejtey and Miller (1978).

Geologic setting

Geologic description

The host rock of this prospect is quartz monzonite of Cretaceous or Tertiary age (Richter, 1963) Silicified, fluorite-bearing, shear zones in the quartz monzonite contain lenses, vugs and masses of molybdenite crystals and other sulfides, chiefly pyrite, chalcopyrite, and sphalerite. Channel samples contain up to 0.1 percent molybdenum and 0.1% zinc (Richter, 1963). The mineralization is probably a quartz-monzonite-related porphyry deposit.
Geologic map unit (-149.32016221631, 62.8592185503572)
Mineral deposit model Porphyry Cu-Mo (Cox and Singer, 1986; model 21a)
Mineral deposit model number 21a
Age of mineralization In Cretaceous or Tertiary rocks.
Alteration of deposit Silicification along shear zones.

Production and reserves

Workings or exploration Workings consist of a bench cut and a short adit. Channel samples contain up to 0.1 percent molybdenum and 0.1 percent zinc (Richter, 1963). Further exploration at this locality may be justified but would require heavy equipment or drilling due to poor surface exposure (Richter, 1963).
Indication of production None

Additional comments

MAS/MILS number 20760004.

References

MRDS Number A012163

References

Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 9/30/2002