Unnamed Occurrence (ARDF - PM028; near Renshaw Point), Aleutians East Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - PM028; near Renshaw Point)	- not defined -
Aleutians East Borough	Borough
Alaska	State
USA	Country

This site is located on land selected by the Aleut Corporation.
Location: This occurrence is at an elevation of about 500 feet on the southwest side of Dorenoi Bay, about 1.25 miles northwest of Renshaw Point (Christie, 1974, color anomaly 74; MacKevett and Holloway, 1977, locality 20; Wilson and others, 1988, locality 20). The location is accurate to within 1,200 feet.
Geology: The area of this occurrence has been mapped by Wilson and others (1995) as Miocene volcanics. According to Butherus and others (1979), the area contains steeply northeast-dipping latite, andesite or basalt flows, and flow breccias overlying sandstone, shale, and conglomerate. The site is marked by a 10,000- by 5,000-foot color anomaly (Christie, 1974, number 74). Christie describes the deposit as quartz-calcite veins containing minor arsenopyrite, pyrite, sphalerite, and galena. The veins cut the volcanic rocks and strike nearly south. The veins become more numerous towards Renshaw Point and in one 100- by 200-foot area form a pyritic stockwork. Anderson and others (1980) describe the veins as being as much as 2 feet thick and occurring near prominent shear zones. They also note a 12- to 15-foot thick latite dike that crops out over a distance of 1,000 feet and contains disseminated sphalerite and galena. In many areas the rocks exhibit moderate to strong carbonate alteration, the largest area of which is in andesite or latite and is 100 feet wide and 4,000 feet long. Rock samples collected by Resource Associates of Alaska (Anderson and others,1980) from various veins and shear zones assayed as much as 11.5 percent copper, 1.47 percent lead, 11 percent zinc, 0.84 ounce of gold per ton, and 209 ounces of silver per ton. The latite dike with disseminated sulfides assayed as much as 0.39 ounce of gold per ton and 2 percent zinc.
Workings: Christie (1974) reconnaissance-mapped the area and collected eight silt or soil samples. All had detectable gold. Assays ranged from up to 0.03 ppm gold, 4.9 ppm silver, 200 ppm zinc, and low copper and molybdenum values. Rock samples collected by the U.S. Geological Survey studies in the mid-1980's (samples 83ADt 95 and 96) contained as much as 7 ppm silver. Five vein and shear samples collected by Resource Associates of Alaska in 1980 assayed as much as 11.5 percent copper, 1.47 percent lead, 11 percent zinc, 0.84 ounce of gold per ton, and 209 ounces of silver per ton.
Age: Miocene or younger.
Alteration: Moderate to strong carbonate alteration is present in most of the volcanic units. This may be a form of propylitic alteration.

Commodities (Major) - Ag, Au; (Minor) - Cu, Pb, Zn
Development Status: None
Deposit Model: Epithermal gold veins, Polymetallic veins (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	PM028

Other Regions, Features and Areas containing this locality

References