|Quadrangle map, 1:250,000-scale||DE|
|Quadrangle map, 1:63,360-scale||D-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Cordova Group consists of 8 claims about one-quarter mile north of the abandoned village of Klinkwan. The claims are just west of the head of the northwest arm of Klinkwan Cove, near the center of the NW1/4 section 31, T. 80 S., R. 87 E.|
Geologic descriptionJust above the high tide line at the head of the northwest arm of Klinkwan Cove, a small pit exposes carbonaceous slate that is cut by quartz stringers that contain some pyrite and chalcopyrite (Wilcox, 1937 [PE 121-2]). Wilcox collected two samples of the most highly mineralized slate-quartz rock; the best one contained 2.08 ounces of gold per ton and 0.6 ounce of silver per ton. About one-quarter mile 'back' of Klinkwan, an outcrop of greenstone is highly fractured. The fractures, which vary from 1 to 10 inches wide, are filled with calcite that contain sparse, disseminated pyrite and chalcopyrite, some of which is altered to bornite. A sample of the most highly mineralized material contained only a trace of gold and silver. Gehrels (1992) has mapped the rocks in the area as mudstone and siltstone of the Devonian Karheen Formation; several major, northwest-trending faults are nearby.
|Geologic map unit||(-132.365862840716, 54.8951576162884)|
|Mineral deposit model||Sulfide-bearing, quartz and calcite veinlets in slate and greenstone.|
|Age of mineralization||The mineralized fractures cut Devonian rocks.|
|Workings or exploration||Only a few surface pits.|
|Indication of production||None|
Additional commentsThese prospects are in the South Prince of Wales Wilderness, which is closed to prospecting and mineral exploration.
Gehrels, G. E., 1992, Geologic map of southern Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2169, 23 p., 1 sheet, scale 1:63,360.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||9/1/2003|