|Quadrangle map, 1:250,000-scale||JU|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Nowell-Otterson prospect is at an elevation of approximately 2500 feet on Mansfield Peninsula, 2.25 miles southeast of Funter Bay, 1.5 miles northwest of Snowy Mountain, and 1 mile south of Mount Robert Barron. It is in the SW1/4SW1/4 section 19, T. 42 S., R. 65 E. of the Copper River Meridian. The location is accurate. The Alaska Dano (JU236) and the Nowell-Patterson prospect are in the same block of patented mining claims.|
This deposit was discovered prior to 1898 (Wells and others, 1986). It consists of multiple quartz veins in mica schist and chlorite schist near a granitic intrusive (Cobb, 1978 [OFR 78-374]). The veins strike N 20 W. and dip NE, parallel to the strike of the schistose host rocks. The veins can be traced discontinuously northwest to the Alaska Dano Mine (JU235). One vein is 15 to 25 feet thick and has been traced for 2,300 feet. It consists of quartz and calcite, with pyrite and pyrrhotite, and minor galena, specular hematite, and native gold. Another vein, 30 inches thick, consists of white quartz, pyrite, specular hematite, and minor chalcopyrite, galena, and copper oxides. It is crosscut by a calcite vein. The prospect is developed by 2 shafts, an unknown amount of drifts, and some open cuts (Wells and others, 1986). The prospect is included with the Alaska Dano and War Horse deposits in some reports (Cobb, 1978).The rocks in the general area are mainly Ordovician and Devonian to Triassic clastic units, mafic-intermediate volcanic rocks, and subordinate limestone. The bedded rocks are intruded and locally metamorphosed by Cretaceous granodiorite (Gehrels and Berg, 1994).
|Geologic map unit||(-134.856592423952, 58.2096635734732)|
|Alteration of deposit||Local oxidation of copper and iron minerals.|
|Workings or exploration||The prospect is developed by 2 shafts, an unknown amount of drifts, and some open cuts (Wells and others, 1986).|
|Indication of production||Undetermined|
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Juneau quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-374, 155 p.
Gehrels, G.E., and Berg, H.C., 1994, Geology of southeastern Alaska, in Plafker, George, and Berg, H. C., eds., The geology of Alaska: Geological Society of America, DNAG, The geology of North America, Vol. G-1, p. 451-467.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska )|
|Last report date||12/15/2001|