Unnamed (near White Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Ba; Cu; Sr
Ore minerals barite; celestite; chalcopyrite; gold; pyrite; silver; sphalerite; strontianite; witherite
Gangue minerals ankerite

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale D-6
Latitude 58.8171
Longitude -135.9192
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2,400 feet, approximately 2 miles east of Mt. Case and 1 mile north of the White Glacier. It is in the SW1/4 section 21, T. 35S., R. 57 E. of the Copper River Meridian. This occurrence is close to location J006 of Wells and others (1986). The location is accurate within 1/4 mile.

Geologic setting

Geologic description

The general area is underlain by deformed and metamorphosed Silurian or Devonian carbonate, clastic and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992).
Brew and others (1978) map the country rocks at this occurrence as Permian, thin-bedded limestone and argillite, basalt and andesite, and cherty limestone and siltstone. The deposit is in cherty limestone and consists of an iron-stained zone about 8 feet thick that contains pyrite, chalcopyrite, sphalerite, native silver, native gold, ankerite, barite, celestite, strontianite, and witherite. The deposit is truncated to the south by a mafic dike and is lost under surficial material to the north (Brew and others, 1978). Samples of this zone near a volcanic contact contained up to 4.5 percent zinc, 1,900 ppm copper, 7 ppm silver, 5,000 ppm barium and 500 ppm antimony (Still, 1989). Still (1989) interprets the deposit as a stratabound volcanogenic deposit.
Geologic map unit (-135.921072796009, 58.8167230947743)
Mineral deposit model Possible metamorphosed Kuroko massive sulfide deposit (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a
Alteration of deposit Conspicuous iron-staining.

Production and reserves

Indication of production None

References

MRDS Number A012113

References

Reporters J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date 12/15/2001