Unnamed Prospect (ARDF - JU072; north of mouth of York Creek), Glacier Bay Mining District, Juneau Mining District, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - JU072; north of mouth of York Creek)	- not defined -
Glacier Bay Mining District	- not defined -
Juneau Mining District	Mining District
Alaska	State
USA	Country

Location: This prospect is at an elevation of approximately 100 feet, 0.5 mile north-northwest of the mouth of York Creek It is just east of the center of section 24, T. 37 S., R. 57 E. of the Copper River Meridian. The location is accurate.
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). This deposit was discovered in 1899. It is in hornfels, and consists of 5 widely-spaced, pyrite-rich quartz veins and of altered zones that contain pods of pyrite. The veins are up to 0.5 foot thick, and the altered zones are up to 50 feet thick. A nearby, half-mile-long, iron-stained zone in siliceous limestone contains 5-10% pyrrhotite (Brew and others, 1978). A select grab sample of one of the quartz veins contained 1,500 ppm copper, 150 ppm cobalt, 150 ppm nickel, and a trace of gold (MacKevett and others, 1971).
Workings: Surface sampling only.
Alteration: Conspicuous iron-stained zone.

Commodities (Major) - Co, Cu, Ni; (Minor) - Au
Development Status: No

Other Databases

Link to USGS - Alaska:	JU072

Other Regions, Features and Areas containing this locality

References