Unnamed (east of head of Lake Fork of Paint River)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Fe
Ore minerals chalcopyrite; magnetite; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale A-4
Latitude 59.2422
Longitude -154.4847
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1,600 feet, east of the head of Lake Fork and 1.35 miles west of hill 3169. The prospect is in the NW1/4 sec.10, T. 11 S., R. 31 W., Seward Meridian. The site corresponds to locality 17 of Detterman and Cobb (1972) and locality 17 of Reed (1967), and is accurate within about 0.5 mile.

Geologic setting

Geologic description

The area of this prospect is underlain mainly by Jurassic, biotite-hornblende quartz diorite (Detterman and Reed, 1980). At the prospect, the quartz diorite intrudes hornblende gabbro (Reed, 1967).
The prospect is a 100- to 150-foot-wide breccia zone in quartz diorite. The breccia is cut by a 0.5- to 2-foot-wide, malachite-stained fault zone and by many smaller, sulfide-rich, quartz(?) veins. The sulfides almost certainly include chalcopyrite and pyrite. Four of five grab samples of mineralized rock collected by Reed (1967) contained more than 0.5 percent copper. One grab sample assayed 11.9 parts per million (ppm) gold, 20 ppm silver, and more than 5,000 ppm copper. Selected sulfide-rich specimens from the mineralized fault zone yielded assays of more than 0.5 ounce of gold per ton (Reed, 1967; Cobb, 1976).
The prospect was restaked in 1964, possibly for iron present as magnetite(?). A short, partly caved, adit found by Reed (1967) dates from an earlier period of exploration.
Geologic map unit (-154.486830263972, 59.241514258151)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c?
Age of mineralization Jurassic or younger.
Alteration of deposit Oxidation of copper.

Production and reserves

Workings or exploration The prospect was explored by a short adit that was partly caved when visited by Reed (1967). The prospect area was restaked in 1964 during a flurry of exploration for iron on the Alaska Peninsula.
Indication of production None


MRDS Number A013047


Reporters C.C. Hawley, Hawley Resource Group, Anchorage, Alaska
Last report date 6/9/2003