Prospect, Undetermined

Commodities and mineralogy

Main commodities Cu; Zn

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale B-5
Latitude 55.331
Longitude -131.518
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is known only from U.S. Bureau of Mines (1977) claim records. Its approximate location is at an elevation of about 100 feet on Whitman Creek, about 0.3 mile north of the mouth of Herring Bay. The site is in section 25, T. 75 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 75 in Elliott and others (1978). The location is accurate within about 0.2 mile.

Geologic setting

Geologic description

The country rocks in this part of Revillagigedo Island are mainly marine, andesitic or basaltic metavolcanic rocks and interbedded pelitic metasedimentary rocks that are intruded by Cretaceous sills and dikes of feldspar-porphyritic granodiorite, and by a stock of Tertiary gabbro (Berg and others, 1988). The strata and some of the granodiorite were regionally metamorphosed to greenschist grade in Late Cretaceous time, and subsequently remetamorphosed to hornblende hornfels near the contacts of the gabbro stock. The premetamorphic age of the strata is uncertain. Berg and others (1988) note that they closely resemble Upper Jurassic to mid-Cretaceous flysch and volcanic rocks nearby on Gravina Island.
According to U.S. Bureau of Mines claim records (1977), this prospect, which appears to be in metasedimentary rocks near the contact of the gabbro stock, was staked for copper and zinc. No other information about it has been made public.
Geologic map unit (-131.519686120199, 55.3306536861101)

Production and reserves

Indication of production None