Ankle Creek prospect, Aleutians East Borough, Alaska, USAi

Regional Level Types
Ankle Creek prospect	Prospect
Aleutians East Borough	Borough
Alaska	State
USA	Country

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

Location: The map site of the Ankle Creek prospect is at an elevation of 600 feet, about 1,000 feet north-northwest of the center of sec. 3, T. 58 S., R. 75 W., Seward Meridian. The location is accurate to within 1,200 feet.
Geology: The Ankle Creek quartz vein is parallel to the Surprise vein (PM089), and crops out approximately 200 feet to the southeast. It is as much as 50 feet in width and has been exposed for 130 feet on strike. Based on float, air photo lineaments, and ground magnetics, the Ankle Creek vein has been traced for approximately 1,200 feet to the northeast where it intersects the Amethyst vein (PM092) (Peterson and others, 1982, figure 11). The vein is hosted in andesite flows which belong to the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The flows exhibit propylitic alteration near the vein. Pyrite apparently is widespread. Two trenches have been cut across the vein at its southwest end. Float samples of vein material assayed as much as 0.30 ounce of gold and 0.60 ounce of silver per ton (Trujillo and others, 1981). The best trench sample assayed 0.014 ounce of gold and 0.03 ounce of silver per ton over 12 feet. This includes a 5-foot interval grading 0.048 ounce of gold and 0.03 ounce of silver per ton. Assays from the other trench were 0.003 ounce of gold and 0.02 ounce of silver per ton over 7 feet, and 0.005 ounce of gold and 0.04 ounce of silver per ton over 3 feet. The assays also show varying amounts of copper, lead, zinc, and mercury. Three holes were drilled to intersect the vein at depth. Apparently only one hole (AQANK-2) was successful. Where intersected, the vein had narrowed to 8 feet and was almost entirely devoid of gold (Trujillo and others, 1981).

Workings: During the period 1979 to 1981 Resource Associates of Alaska mapped and sampled the prospect, conducted a magnetic survey, cut two trenches, and drilled three core holes (Trujillo and others, 1981). Float samples assayed as much as 0.30 ounce of gold per ton, whereas the best in-place metal values were from a 12-foot-long trench sample that assayed 0.014 ounce of gold per ton.

Age: Eocene or younger.

Alteration: Andesite host rocks are propylitically altered.

Commodities (Major) - Ag, Au; (Minor) - As, Cu, Hg, Pb, Zn

Development Status: None

Deposit Model: Epithermal gold vein

Other Databases

Link to USGS - Alaska:	PM090

Other Regions, Features and Areas containing this locality

References