|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is near a four-wheeler (all-terrain vehicle) trail on a ridgeline northeast of Wall Street Creek. It is about 0.5 mile southeast of hill 3560. The occurrence is in section 10, T. 26 N., R. 19 E., of the Copper River Meridian. The location is accurate.|
Geologic descriptionThe rocks in the vicinity of this occurrence are Paleozoic amphibolite-facies paragneiss, quartzite, schist, and amphibolite and Mississippian to Devonian augen gneiss and orthogneiss (Werdon and others, 2001). These units are cut by a prominent, 50-foot-wide, northeast-trending, high-angle fault that can be seen as a topographic linear in air photos. Biotite(?) in schist and gneiss in the fault zone is altered to chlorite. An assay of iron-stained fault breccia with angular schist and (or) gneiss clasts cemented by crystalline quartz with open vugs contains 30 ppb gold (Szumigala and others, 2000).
|Geologic map unit||(-141.675277309428, 64.0468762939354)|
|Mineral deposit model||Fault-hosted gold.|
|Age of mineralization||Mississippian or younger, because the fault offsets Mississippian to Devonian augen gneiss and orthogneiss.|
|Alteration of deposit||Chlorite alteration of biotite(?) in schist and gneiss.|
|Indication of production||None|
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Finseth, B.A., Pinney, D.S., and Flynn, R.L., 2000, Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in a portion of the Fortymile mining district, Alaska, in 1999: Alaska Division of Geological and Geophysical Surveys Raw-Data File 2000-1, 24 p., 2 sheets, scale 1:63,360.
|Last report date||5/1/2002|