Pook Prospect, Unga Island, Aleutians East Borough, Alaska, USAi

Regional Level Types
Pook Prospect	Prospect
Unga Island	Island
Aleutians East Borough	Borough
Alaska	State
USA	Country

The prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Location:
This prospect is approximately 4,000 feet northwest of Apollo Mountain on Unga Island (Wilson and others, 1988, locality 28). The map site is at an elevation of about 750 feet, in the SE1/4 of sec. 35, T. 75 S., R. 75 W., of the Seward Meridian. The location is accurate to within 1,200 feet.

Geology:
The Pook prospect is in rocks mapped as the late Eocene to early Oligocene Popof volcanic rocks. It is a northeast-striking, gold-bearing pyritic quartz-calcite vein system 10 to 70 feet wide and 2,000 feet long. A trace of chalcopyrite occurs in some of the veins. Individual veins in the system are as much as15 feet thick. The mineralized zone occurs along a fault contact between a basalt flow and a sequence of pyroclastic rocks and andesite flows. The vein material is sheared and crushed and shows evidence of repeated movement, resulting in a complex structural pattern. Anomalous gold values occur throughout the entire length of the zone. The best surface grades are 0.098 ounce of gold per ton, 1.47 ounces of silver per ton, 210 ppm copper, 1,000 ppm lead, 130 ppm zinc, 300 ppm arsenic, and 0.15 ppm mercury. A single drill hole apparently missed this zone at depth but hit a deeper, 76-foot-thick zone. A 35-foot section of this deeper zone assayed 0.005 to 0.020 ounce of gold per ton and 0.02 to 0.06 ounce of silver per ton. In 1991, Battle Mountain Exploration Company collected 26 power auger, 19 rock, and 15 soil samples at the prospect in a 2,600- by 1,000-foot area. Eighty percent of these samples returned low-level gold values between 26 ppb and 100 ppb. One high grade vein sample assayed 0.13 ounce of gold per ton.

Workings:
In 1981, Resource Associates of Alaska mapped the prospect, collected about 300 samples, conducted magnetometer and EM surveys, and drilled one 365-foot diamond drill hole. The best metal values obtained from the prospect include 0.098 ounce of gold per ton, 1.47 ounces of silver per ton, 210 ppm copper, 1,000 ppm lead, 130 ppm zinc, 300 ppm arsenic, and 0.15 ppm mercury. Eighty percent of rock, soil, and power auger samples collected by Battle Mountain Exploration Company in 1991 contained gold values between 26 ppb and 100 ppb. The remainder lacked gold, except for one sample of Pook vein material, which assayed 0.13 ounce of gold per ton.

Age:
Eocene or younger.

Alteration:
The only alteration reported is silicification.

Commodities:
(Major) - Ag, Au; (Minor) - Hg

Development Status:
None

Deposit Model:
Epithermal gold vein

Other Databases

Link to USGS - Alaska:	PM073

Other Regions, Features and Areas containing this locality

References