Unnamed (north of White Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au; Cu; Mo; Pb; Zn
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale D-6
Latitude 58.8255
Longitude -135.9246
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,300 feet, approximately 2 miles east-northeast of Mt. Case and 1.5 miles north of the White Glacier. It is in the NW1/4 section 21, T. 35 S., 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 consists of lenses and disseminations of pyrite in andesite. It is marked by iron-stained zones hundreds of feet wide and up to 1000 feet long (Brew and others, 1978). MacKevett and others (1971) report that a 6-foot chip sample contained 2 percent zinc, but Brew and others (1978) failed to find samples with elevated zinc. Still (1989), reports samples that contain anomalous gold, lead and molybdenum.
Geologic map unit (-135.926473116149, 58.8251221467542)
Mineral deposit model Possible metamorphosed Kuroko massive sulfide (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a
Alteration of deposit Conspicuous iron-staining.

Production and reserves

Workings or exploration Surface sampling only.
Indication of production None

References

MRDS Number A012115

References

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