Pandora Prospect, Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Pandora Prospect	Prospect
Prince William Sound Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Patent was applied for in 1924.
Location: The prospect is located at an elevation of 350 feet on the south side of the unnamed creek that drains into the South Arm of Bay of Isles. It is in the NW1/4 section 15, T. 3 N., R. 10 E., of the Seward Meridian. This is location 20 of Condon and Cass (1958), location 100 of Cobb and Richter (1972), location 128 of MacKevett and Holloway (1977), location 210 of Cobb and Tysdal (1980), and location S-65 of Jansons and others (1984). This location is accurate to within 300 feet.
Geology: The prospect consists of parallel mineralized shear zones that strike N10E and dip 70 to 80W (Kurtak and Jeske, 1986). Individual zones as much as 15 feet wide enclose lenses of unsheared greenstone and form an aggregate width of 90 feet. The shear zones are traceable for about 6 miles along strike. The sheared rock is chloritized greenstone schist that is locally brecciated (Kurtak and Jeske, 1986). The greenstone is mapped as Orca Group of early Teriary age (Nelson and others, 1985). Sulfide minerals in the zone are chalcopyrite, pyrite, pyrrhotite, cubanite, and sphalerite (Cobb and Tysdal, 1980). Workings on the prospect consist of a 96-foot-deep shaft, an adit with two drifts totalling more than 150 feet, and a 100-foot-long open cut near the collar of the shaft. Poy (1926) reported that the mineralization averaged 2.2 percent copper over a width of 18 feet in the underground drifts. Samples from the surface cut contained from 38 ppm to 4.0 percent copper and from trace to 6.0 ppm silver. Some ore was shipped from the property in 1908 (Kurtak and Jeske, 1986).
Workings: The property was developed by a 96-foot-deep shaft, an adit with two drifts totalling more than 150 feet, and a 100-foot-long open cut near the collar of the shaft (Johnson, 1916; Kurtak and Jeske, 1986). Poy (1926) reported that the mineralization averaged 2.2 percent copper over a width of 18 feet in the underground drifts. The shaft is currently flooded (Kurtak and Jeske, 1986). Samples from the surface cut contained from 38 ppm to 4.0 percent copper and from trace to 6.0 ppm silver (Kurtak and Jeske, 1986).
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Alteration: Greenstone has been chloritized.
Production: In 1908, a small but unknown amount of ore was shipped (Kurtak and Jeske, 1986).
Reserves: Poy (1926) inferred a reserve of 85,000 tons of ore containing 1.31 percent copper and 5.4 percent iron. Rogers and Hoyt (1999) reported a reserve of 85,000 tons containing 2,040,000 pounds of copper, 425 ounces of gold and 8,500 ounces of silver.

Commodities (Major) - Cu, Zn
Development Status: Undetermined.
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

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Link to USGS - Alaska:	SR258

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References