Origin

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale A-2
Latitude 55.19
Longitude -160.665
Nearby scientific data Find additional scientific data near this location
Location and accuracy The map site of the Origin prospect is at an elevation of 400 feet, near the north end of the boundary between secs. 3 and 4, T. 58 S., R. 75 W., Seward Meridian. The location is accurate to within 1,200 feet.

Geologic setting

Geologic description

The Origin prospect consists of a knob of silicified and propylitized andesite on the trace of the Aquila linear (Peterson and others, 1982, figure 11). The andesite, which contains as much as 5 percent disseminated pyrite, is part of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995).
Trenches exposed a 70-foot-wide quartz-clay vein comprising 80 percent quartz and 20 percent clay. No trench sample of the vein contained more than 0.138 ppm gold, and most contained no detectable gold. Combined copper, lead, and zinc values ranged from 80 to 100 ppm. The samples contained as much as 500 ppm arsenic and 0.45 ppm mercury. One drill hole intersected a 25-foot zone averaging 0.171 ppm gold.
Geologic map unit (-160.667067700392, 55.1891632224784)
Age of mineralization Eocene or younger.
Alteration of deposit The host rocks are silicified and propylitized.

Production and reserves

Workings or exploration During the period 1979 to 1982 Resource Associates of Alaska and UNC Teton Exploration Drilling Company mapped and sampled the prospect, drilled one 577-foot core hole, and cut four trenches for a total of 805 feet (Peterson and others, 1982). The 145 trench samples were essentially barren of base and precious metals. The drill hole intersected a 25-foot zone averaging 0.171 ppm gold.
Indication of production None

Additional comments

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

References

MRDS Number 10308152

References

Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E., 1982, Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters S.H. Pilcher
Last report date 2/1/2001