This site corresponds to two color anomalies as reported by Christie (1974). The first color anomaly is 4,000 ft (1,200 m) by 2,000 ft (600 m) in size and located on a gossan that occurs along the contact between granodiorite of the Shaler batholith and hornfelsed volcanic rocks of the Unalaska Formation (see Drewes and others, 1961). Christie (1974) reported that alaskite and granodiorite (including some aplite) dikes associated with the Shaler batholith are common; five or six 10 ft to 30 ft (3 to 9 m) wide dikes of which were mapped within this anomaly area. A stockwork of intense pyrite veining occurs in the vicinity of the dikes as do some quartz veins having sericite-pyrite envelopes occur. A feldspar porphyry dike(?) is reported as showing weak propylitic alteration. Only copper (mineral) seen was in a single piece of float in creek, it had chalcopyrite as fracture filling and pyrite-chalcopyrite as disseminations in the adjacent wall rock.
In a second area to the south of the above color anomaly, a triangular color anomaly 3,000 ft (900 m) north-south by 1,500 ft (450 m) east-west shows a clear relationship between a sulfide system and a quartz-eye porphyry dike. The color anomaly is cut off on the east by the sea, where it is widest and most intense. The dike narrows is divided into a number of narrow stringers in the west and widens to the east where it may grade into a feldspar (+/- quartz-eyes) porphyry. Alteration are most intense and sulfides are most common where the dike is widest on east. Pyrite occurs within the dike and the immediately adjacent wall rock as veins having envelopes of quartz sericite alteration. Chalcopyrite, pyrite, and chlorite occur in veins and disseminations less than 50 ft (15 m) from the dike contact. Christie (1974 mentions a mineralized zone 200 ft by 800 ft (61 m by 244 m) in maximum size and that most of the rock in this zone contains no chalcopyrite. It is not clear what the relationship of this mineralized zone has to other parts of the described color anomaly.Fracturing is moderately intense in both areas.