Greenpoint Prospect, Hyder Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Greenpoint Prospect	Prospect
Hyder Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

The Greenpoint claims staked in 1970 (Berg and others, 1977, p. 94) extend beyond the Greenpoint prospect described in this record and cover the old Heckla prospect, which is described separately (BC024). Site is in Misty Fiords National Monument.
Location: The Greenpoint prospect is at an elevation of about 2700 feet on an untimbered point about 750 feet south of the confluence of Greenpoint and Through glaciers (Berg and others, 1977, p. 93-96; Elliott and Koch, 1981, p. 10, loc. 23). The location is probably accurate to within about a quarter of a mile. Also see Additional Comments field, below.
Geology: The country rocks in the area of the Greenpoint prospect are pelitic metasedimentary and andesitic metavolcanic rocks of the Jurassic or older Mesozoic Hazelton Group, and quartz monzonite and granodiorite of the Eocene Hyder Quartz Monzonite (Berg and others, 1977, p. 15-17, 22-23; Smith, 1977; Koch, 1996). The deposit (Berg and others, 1977, p. 93-96) consists of numerous quartz-calcite fissure veinlets up to 6 inches thick in multiple fracture sets that cut pelitic hornfels of the Hazelton Group. The veinlets contain up to 5% pyrite, lesser amounts of galena and molybdenite, and traces of chalcopyrite. Chip samples of the veinlets collected in 1972 by U.S. Bureau of Mines investigators contained as much as 30 ppm Ag. Average metal content was 2.4 ppm Ag, 400 ppm Pb, and 65 ppm Mo. One sample assayed 1100 ppm Zn.
Workings: Explored, probably in 1920's, by a small pit and open cut. Chip samples of veinlets collected in 1972 by the U. S. Bureau of Mines averaged 2.4 ppm Ag, 400 ppm Pb, and 65 ppm Mo. One sample contained 30 ppm Ag, and one assayed 1100 ppm Zn.

Commodities (Major) - Ag, Cu, Mo, Pb
Development Status: None
Deposit Model: Polymetallic veins

Other Databases

Link to USGS - Alaska:	BC023

Other Regions, Features and Areas containing this locality

References