|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Lowery's Ledge occurrence is located about 2.7 miles east-southeast of Boundary at an elevation of about 3,400 feet in section 2, T. 26 N., R. 22 E. The location is accurate within one-half mile. Lowery's Ledge is locality 15 of Cobb (1972 [MF-393]).|
Geologic descriptionThe rocks in the vicinity of Lowrey's Ledge are Paleozoic greenschist-facies metamorphic rocks of the Nasina Series (Szumigala and others, 2002). Spurr (1898) observed quartz veins in schist that contain free gold and minute specks of iron and copper pyrites (chalcopyrite?). Free gold occurs in nearly horizontal quartz veins that are 10 to 12 inches thick (Eberlein and others, 1977). The quartz veins are parallel to the foliation of the schist. One specimen of quartz contained a gold flake that was about 0.003 inch in diameter. There is no record of any mining.
|Geologic map unit||(-141.027058380078, 64.0615948291407)|
|Indication of production||None|
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
Spurr, J.E., and Goodrich, H.B., 1898, Geology of the Yukon gold district, Alaska, with an introductory chapter on the history and present condition of the district by H.B. Goodrich in Walcott, C.D., editor, Eighteenth annual report of the United States Geological Survey to the Secretary of the Interior, 1896-1897: Part III - Economic geology: U.S. Geological Survey 18th Annual Report, Part 3, p. 87-392.
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Flynn, R.L., and Clautice, K.C., 2002, Bedrock geologic map of the Eagle A-1 quadrangle, Fortymile mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2002-1b, 1 sheet, scale 1:63,360.
|Last report date||5/1/2002|