Von Frank - North

Occurrence, Inactive

Commodities and mineralogy

Main commodities As; Sb
Other commodities Au; Co
Ore minerals arsenopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MD
Quadrangle map, 1:63,360-scale C-3
Latitude 63.545
Longitude -154.353
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Von Frank - North occurrence is situated on a southwest spur of Von Frank Mountain at an elevation of approximately 2,800 feet (853 m) in Section 36, T. 22 S., R. 23 E., of the Kateel River Meridian. The prospect was located on a 1:63,360 scale map by Clautice and others (1993), and is accurate to within 250 feet (76 m).

Geologic setting

Geologic description

Thin stockwork-type arsenopyrite-pyrite veins developed in granodiorite at the west side of Von Frank Mountain intrusion. No dimensions or aerial extent are given (Clautice and others, 1993; DiMarchi and others, 1994) The age of mineralization is Late Cretaceous, based on inferred age of 70.0 Ma Von Frank Mountain pluton (Patton and others, 1980; Moll and others, 1981). In 1992, Clautice and others (1993) collected grab samples of intrusive-hosted mineralization, which contained up to 78 ppb gold, 192 ppm antimony, and 100 ppm cobalt.
Geologic map unit (-154.355343442069, 63.5444069661395)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The age of mineralization is Late Cretaceous, based on inferred age of 70.0 Ma Von Frank Mountain pluton (Moll and others, 1981).
Alteration of deposit Sericite-quartz-ankerite in intrusion.

Production and reserves

Workings or exploration In 1991, Central Alaska Gold Company began a sampling program and encountered auriferous mineralization in a border phase of the Von Frank Mountain intrusion (DiMarchi and others, 1994). In 1992, Clautice and others (1993) collected grab samples of intrusive-hosted mineralization, which contained up to 78 ppb gold, 192 ppm antimony, and 100 ppm cobalt.
Indication of production None
Reserve estimates None.

Additional comments

See: Von Frank - South prospect (MD036). The Von Frank - North occurrence is on lands selected or owned by Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave, Fairbanks, Alaska 99701.

References