Unnamed Prospect (ARDF - SR251; south end of Herring Bay), Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - SR251; south end of Herring Bay)	- not defined -
Prince William Sound Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Location: The prospect is located in the S1/2 section 21, T. 4 N., R. 10 E., of the Seward Meridian on the southeast side of the south end of Herring Bay between sea level and 110 feet elevation. This is locations 203 and 204 of Cobb and Tysdal (1980) and location S-76 of Jansons and others (1984). This location is accurate to 300 feet.
Geology: The prospect consists of several short adits and a prospect pit that explored thin, discontinuous sulfide veins, stringers, and lenses hosted in sheared greenstone of the Orca Group of early Teriary age. Sulfide minerals are chalcopyrite, pyrite, pyrrhotite, and sphalerite (Cobb and Tysdal, 1980). A 50-foot adit was driven into fractured greenstone healed with quartz, pyrite, sphalerite, and chalcopyrite (Grant and Higgins, 1909). The prospect pit exposed irregular mineralization consisting of chalcopyrite, sphalerite, and pyrite. Epidote stringers occur in the country rock, but there is no well-defined vein or shear zone associated with these stringers.
Workings: Four workings are described in the literature. Grant and Higgins (1909) described a 25-foot adit that is a quarter of a mile south of the camp and a 50-foot adit. Johnson (1918 [B 662-C, p. 212]) described a 30-foot adit with a 10-foot drift to the north driven at an elevation of 110 feet. He also mentioned a 15-foot-wide open cut, west of the 30-foot adit. When the U.S. Bureau of Mines searched for this prospect in the early 1980's, they found none of these workings, and they did not collect samples from the area. Improvements on the property were two bunk and mess houses on the beach and a floating dock (Grant and Higgins, 1909). No other information is available.
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Alteration: Greenstone is altered to epidote.

Commodities (Major) - Cu; (Minor) - Zn
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

Other Databases

Link to USGS - Alaska:	SR251

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References