Unnamed Occurrence (ARDF - SK008; north of Rainbow Glacier), Haines, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - SK008; north of Rainbow Glacier)	- not defined -
Haines	City Borough
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 3,300 feet, 1.3 miles S44W from survey marker 'Bow' on the west shore of Chilkat Inlet. It is in the SW1/4, section 33, T. 31 S., R. 59 E. of the Copper River Meridian. It corresponds to location 93 in Gilbert (1988) which is the approximate center of a group of sample locations with anomalously high metal values.
Geology: Gilbert (1988) describes numerous samples within an area of about 1/2 mile in diameter as being quartz schist, felsic schist, or silicified rock with varying amounts of pyrrhotite, pyrite, and some chalcopyrite. Sample values are as high as 6.3 ppm silver, 1,300 ppm copper, 215 ppm cobalt, and 1,600 ppm barium. The host rocks are mapped by Gilbert (1988) as Paleozoic volcanics. His descriptions of felsic schist and quartz schist suggest a Paleozoic age for the mineralization if the rocks are volcanic. Alternatively, the felsic and quartz schists may be due to silicification and/or alteration related to nearby Cretaceous granodiorite intrusives.
Age: Unknown. If the felsic schist that hosts the deposit is volcanic, then the mineralization is probably Paleozoic. If the felsic schists are alteration zones peripheral to an intrusive, then the mineralization is probably related to the nearby Cretaceous intrusive rocks (Gilbert, 1988).
Alteration: Silicification?

Commodities (Major) - Ag, Cu; (Minor) - Ba, Co
Development Status: None
Deposit Model: Unknown. Felsic schists are suggestive of a possible volcanogenic massive sulf

Other Databases

Link to USGS - Alaska:	SK008

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References