Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Au; Cr; Zn
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale D-5
Latitude 58.8224
Longitude -135.573
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Endy prospect is at an elevation of about 2,700 feet, approximately 2.5 miles south of Mt. Young and 1 mile north of the Endicott River. It is in the NE1/4 section 21, T. 35 S., R. 59 E. of the Copper River Meridian. The location is accurate within 1/2 mile.

Geologic setting

Geologic description

The 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 Ford (1985) describe the rocks in the area of this occurrence as predominantly Devonian and Silurian greenstone, greenschist, limestone and graywacke intruded by Cretaceous biotite-hornblende granodiorite. The U.S. Bureau of Mines collected samples of rhyolite, pyritic tuff, and metatuff from the Endy prospect. A rhyolite sample contained 0.21 ppm gold, 270 ppm copper, 930 ppm chromium, and 330 ppm arsenic. A sample of a quartz vein contained 1,400 ppm copper. The deposit was discovered by St. Joseph Mining Co. in 1974, who interpreted it as a stratiform massive sulfide deposit (Clough and Redman, 1989).
Geologic map unit (-135.574851511806, 58.8220566067105)
Mineral deposit model Possible metamorphosed Kuroko massive sulfide deposit (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a

Production and reserves

Workings or exploration The deposit was discovered by St. Joseph Mining Co. in 1974 (Clough and Redman, 1989).
Indication of production None