|Quadrangle map, 1:250,000-scale||DE|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Veta prospect is about 0.2 mile northwest of the head of Mallard Bay, and about 0.2 mile south of the center of section 6, T. 82 S, R. 90 E. (The Veta prospect is often included with the Polson and Ickis prospects (DE039) in early reports).|
The rocks in the area are Silurian or Ordovician quartz monzonite, syenite, and quartz diorite that are part of a batholith that makes up the southeastern tip of Prince of Wales Island (Gehrels, 1992). There are several prominent northwest-trending faults near the prospect.The workings consist of two flooded vertical shafts, one 30 feet deep and the other 78 feet deep, and about 78 feet of drifts and crosscuts (Knopf, 1910; MacKevett, 1963; Maas and others, 1991). The working are in fine-grained diorite along a fault zone about 3 feet wide that strikes N 5 0W and dips 80 NE. The fault zone and its wallrocks are pervasively altered to secondary iron minerals and clay. Quartz veins in the fault contain pyrite and chalcopyrite, along with less-abundant bornite, malachite (?), chrysocolla, and hematite. The sulfides are also disseminated through the wall rocks. Maas and others (1991) collected several samples from rubble crop and dumps that contained 1,833 parts per million (ppm) to 6.41 percent copper, 5.6 to 25.7 ppm silver, and 94 to 7,258 parts per billion gold.
|Geologic map unit||(-132.02596876464, 54.7845576228816)|
|Mineral deposit model||Quartz vein with copper, gold, and silver values. (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||The vein cuts Silurian or Ordovician granitic rocks.|
|Alteration of deposit||Pervasive alteration of the fault zone and granitic wall rocks to secondary iron oxides and clay minerals.|
|Workings or exploration||The workings consist of two flooded vertical shafts, one 30 feet deep and the other 78 feet deep, and about 78 feet of drifts and crosscuts.|
|Indication of production||None|
Knopf, Adolph, 1910, Mining in southeastern Alaska: U.S. Geological Survey Bulletin 442-C, p. 133-143.
Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
Maas, K.M., Still, J.C., Clough, A.H., and Oliver, L.K., 1991, Mineral investigations in the Ketchikan mining district, Alaska, 1990: southern Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 33-91, 139 p., 12 sheets, scale 1:63,360.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||9/1/2003|