|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 unnamed occurrence is located at an elevation of about 2,650 feet on the ridgeline between Stonehouse Creek and Myers Fork; It is about 3.4 miles north-northwest of Chicken. The occurrence is in section 18, T. 27 N., R. 18 E., of the Copper River Meridian. The location is accurate.|
Geologic descriptionThe rocks in the vicinity of this occurrence are predominantly granitic rocks of the Chicken pluton of Jurassic age (Werdon and others, 2001). Hornblende from the pluton gives a 40Ar/39Ar plateau age of 187.8 +/-0.9 Ma (Layer and others, 2002). The pluton is intruded by an undated, K-feldspar-porphyritic, biotite hornblende granite that is spatially associated with numerous aplite dikes (Werdon and others, 2001). The southern margin of this granite is brecciated and in high-angle fault contact with upper Paleozoic metasedimentary and metavolcanic rocks. The aplite dikes are commonly sericite-altered. A sample of a quartz-veined aplite dike with a weak iron-oxide stain contains 70 ppb gold, 1.4 ppm silver, 4 ppm bismuth, 74 ppm lead, and 50 ppm zinc (Szumigala and others, 2000).
|Geologic map unit||(-141.96198368046, 64.1222707638428)|
|Mineral deposit model||Plutonic-related gold.|
|Age of mineralization||Jurassic or younger.|
|Alteration of deposit||Aplite dikes are commonly altered to sericite and are locally iron stained.|
|Indication of production||None|
Layer, P.W., Drake, J., and Szumigala, D.J., 2002, 40Ar/39Ar dates for mineralization and igneous and metamorphic rocks in a portion of the Fortymile mining district, Eagle quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report. [In preparation in 2002]
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|