Unnamed Occurrence (ARDF - JU055; north of White Glacier), Glacier Bay Mining District, Juneau Mining District, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - JU055; north of White Glacier)	- not defined -
Glacier Bay Mining District	- not defined -
Juneau Mining District	Mining District
Alaska	State
USA	Country

Location: 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.
Geology: 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% zinc, but Brew and others (1978) failed to find samples with elevated zinc. Still (1989), reports samples that contain anomalous gold, lead and molybdenum.
Workings: Surface sampling only.
Alteration: Conspicuous iron-staining.

Commodities (Major) - Au, Cu, Mo, Pb, Zn
Development Status: None
Deposit Model: Possible metamorphosed Kuroko massive sulfide (Cox and Singer, 1986; model 28a)

Other Databases

Link to USGS - Alaska:	JU055

Other Regions, Features and Areas containing this locality

References