Unnamed (south tributary to upper Iron Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Au
Ore minerals malachite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-4
Latitude 62.2672
Longitude -148.8703
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,300 feet on a south tributary of upper Iron Creek. The occurrence is in the NE1/4 sec. 10, T. 25 N., R. 3 E., Seward Meridian. The location is accurate to within 1/2 mile. This is locality 67 of Csejtey and Miller (1978) and locality 67 of Singer and others (1978).

Geologic setting

Geologic description

This occurrence consists of pyrite and malachite in altered Jurassic granitic rock (Csejtey and Miller, 1978). A float sample contains 0.1 part per million gold and 2000 parts per million copper (Miller and others, 1978).
Geologic map unit (-148.872508969141, 62.2667054772943)
Mineral deposit model Porphyry copper? (Cox and Singer, 1986; model 17?)
Mineral deposit model number 17?
Age of mineralization Occurs in Jurassic granitic rocks.
Alteration of deposit The granitic host rock is altered, but the type of alteration is not specified (Csejtey and Miller, 1978). Oxidation of copper minerals to malachite.

Production and reserves

Workings or exploration Only surface sampling by the U.S. Geological Survey (Miller and others, 1978).
Indication of production None


MRDS Number A012184


Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/1/2002